From 0957eaa82541128df3eff113afd1d09371539a0a Mon Sep 17 00:00:00 2001
From: George-lewis <george-lewis@user.noreply.github.com>
Date: Wed, 10 Jan 2024 01:39:02 -0500
Subject: [PATCH] Bless tests

Update tests
---
 ...eature-gate-custom_code_classes_in_docs.rs |   1 +
 ...re-gate-custom_code_classes_in_docs.stderr |   1 +
 .../feature-gate-doc_cfg_hide.stderr          |   1 +
 .../feature-gate-intra-doc-pointers.stderr    |   2 +
 ...-gate-rustdoc_missing_doc_code_examples.rs |   1 +
 ...e-rustdoc_missing_doc_code_examples.stderr |   1 +
 tests/ui-fulldeps/hash-stable-is-unstable.rs  |  15 +++
 .../hash-stable-is-unstable.stderr            |  15 ++-
 tests/ui-fulldeps/pathless-extern-unstable.rs |   1 +
 .../pathless-extern-unstable.stderr           |   3 +-
 .../suggest-array-length.stderr               |   7 ++
 .../ui/associated-consts/issue-105330.stderr  |   2 +
 tests/ui/associated-consts/issue-93835.stderr |   2 +
 .../assoc-inherent-unstable.stderr            |   1 +
 .../dont-select-if-disabled.stderr            |   1 +
 .../issue-109071.no_gate.stderr               |   1 +
 .../issue-109768.stderr                       |   1 +
 .../associated-type-bounds/issue-99828.stderr |   1 +
 .../bad-inputs-and-output.stderr              |   2 +
 .../unpretty-parenthesized.stderr             |   1 +
 .../async-await/feature-async-closure.stderr  |   1 +
 .../async-await/feature-async-for-loop.stderr |   2 +
 .../ui/async-await/issues/issue-95307.stderr  |   1 +
 .../track-caller/async-block.afn.stderr       |   3 +
 .../track-caller/async-block.nofeat.stderr    |   3 +
 .../async-closure-gate.afn.stderr             |   6 +
 .../async-closure-gate.nofeat.stderr          |   6 +
 .../panic-track-caller.cls.stderr             |   2 +
 .../panic-track-caller.nofeat.stderr          |   2 +
 tests/ui/auto-traits/issue-117789.stderr      |   1 +
 tests/ui/auto-traits/pre-cfg.stderr           |   1 +
 tests/ui/bounds-lifetime.stderr               |   2 +
 tests/ui/box/alloc-unstable-fail.stderr       |   1 +
 ...e-gate-extended_varargs_abi_support.stderr |   3 +
 tests/ui/cfg/cfg-false-feature.stderr         |   2 +
 .../arrays-completely-captured.rs             |   1 +
 .../arrays-completely-captured.stderr         |  11 +-
 .../2229_closure_analysis/by_value.rs         |   1 +
 .../2229_closure_analysis/by_value.stderr     |  13 +-
 .../capture-analysis-1.rs                     |   1 +
 .../capture-analysis-1.stderr                 |  17 +--
 .../capture-analysis-2.rs                     |   1 +
 .../capture-analysis-2.stderr                 |  11 +-
 .../capture-analysis-3.rs                     |   1 +
 .../capture-analysis-3.stderr                 |  11 +-
 .../capture-analysis-4.rs                     |   1 +
 .../capture-analysis-4.stderr                 |  11 +-
 .../capture-disjoint-field-struct.rs          |   1 +
 .../capture-disjoint-field-struct.stderr      |   9 +-
 .../capture-disjoint-field-tuple.rs           |   1 +
 .../capture-disjoint-field-tuple.stderr       |   9 +-
 .../2229_closure_analysis/capture-enums.rs    |   2 +
 .../capture-enums.stderr                      |  28 +++--
 .../deep-multilevel-struct.rs                 |   1 +
 .../deep-multilevel-struct.stderr             |  13 +-
 .../deep-multilevel-tuple.rs                  |   1 +
 .../deep-multilevel-tuple.stderr              |  13 +-
 .../destructure_patterns.rs                   |   3 +
 .../destructure_patterns.stderr               |  47 +++----
 .../feature-gate-capture_disjoint_fields.rs   |   1 +
 ...eature-gate-capture_disjoint_fields.stderr |   9 +-
 .../2229_closure_analysis/issue-87378.rs      |   1 +
 .../2229_closure_analysis/issue-87378.stderr  |   9 +-
 .../2229_closure_analysis/issue-88476.rs      |   2 +
 .../2229_closure_analysis/issue-88476.stderr  |  16 +--
 .../2229_closure_analysis/move_closure.rs     |  11 ++
 .../2229_closure_analysis/move_closure.stderr | 119 ++++++++++--------
 .../multilevel-path-1.rs                      |   1 +
 .../multilevel-path-1.stderr                  |   9 +-
 .../multilevel-path-2.rs                      |   1 +
 .../multilevel-path-2.stderr                  |   9 +-
 .../2229_closure_analysis/nested-closure.rs   |   2 +
 .../nested-closure.stderr                     |  30 ++---
 .../optimization/edge_case.rs                 |   1 +
 .../optimization/edge_case.stderr             |   1 +
 .../path-with-array-access.rs                 |   1 +
 .../path-with-array-access.stderr             |   9 +-
 .../preserve_field_drop_order.rs              |   3 +
 .../preserve_field_drop_order.stderr          |  67 +++++-----
 .../2229_closure_analysis/repr_packed.rs      |   3 +
 .../2229_closure_analysis/repr_packed.stderr  |  37 +++---
 .../simple-struct-min-capture.rs              |   1 +
 .../simple-struct-min-capture.stderr          |  11 +-
 .../2229_closure_analysis/unsafe_ptr.rs       |   2 +
 .../2229_closure_analysis/unsafe_ptr.stderr   |  20 +--
 .../2229_closure_analysis/wild_patterns.rs    |   3 +
 .../wild_patterns.stderr                      |  31 ++---
 .../ui/closures/binder/disallow-const.stderr  |   1 +
 tests/ui/closures/binder/disallow-ty.stderr   |   1 +
 .../cmse-nonsecure-call/gate_test.stderr      |   1 +
 .../cmse-nonsecure-entry/gate_test.stderr     |   1 +
 .../cfg-attr-crate-2.stderr                   |   1 +
 .../cfg-attr-multi-invalid-1.stderr           |   1 +
 .../cfg-attr-multi-invalid-2.stderr           |   1 +
 .../cfg-generic-params.stderr                 |   3 +
 .../cfg_accessible-unstable.stderr            |   1 +
 .../issue-89013-no-kw.stderr                  |   1 +
 .../parser-error-recovery/issue-89013.stderr  |   1 +
 .../consts/async-block.without_feature.stderr |   2 +
 .../const-address-of-interior-mut.stderr      |   4 +
 tests/ui/consts/const-address-of-mut.stderr   |   4 +
 .../const-eval/issue-114994-fail.stderr       |   2 +
 tests/ui/consts/const-eval/issue-65394.stderr |   1 +
 .../const-extern-fn-min-const-fn.stderr       |   1 +
 .../feature-gate-const_extern_fn.stderr       |   2 +
 tests/ui/consts/const-fn-error.stderr         |   2 +
 tests/ui/consts/const-for-feature-gate.stderr |   1 +
 tests/ui/consts/const-multi-ref.stderr        |   2 +
 .../feature-gate-const_mut_refs.stderr        |   1 +
 .../const-mut-refs/issue-76510.32bit.stderr   |   1 +
 .../const-mut-refs/issue-76510.64bit.stderr   |   1 +
 tests/ui/consts/const-suggest-feature.stderr  |   1 +
 tests/ui/consts/const-try-feature-gate.stderr |   1 +
 ..._fn_floating_point_arithmetic.stock.stderr |   5 +
 tests/ui/consts/const_let_assign3.stderr      |   3 +
 tests/ui/consts/control-flow/loop.stderr      |   2 +
 tests/ui/consts/control-flow/try.stderr       |   1 +
 .../ui/consts/gate-do-not-const-check.stderr  |   1 +
 .../ui/consts/min_const_fn/address_of.stderr  |   2 +
 .../consts/min_const_fn/min_const_fn.stderr   |  13 ++
 .../min_const_fn_unsafe_bad.stderr            |   4 +
 .../consts/min_const_fn/mutable_borrow.stderr |   2 +
 ...tatic_mut_containing_mut_ref2.stock.stderr |   1 +
 .../consts/write_to_mut_ref_dest.stock.stderr |   2 +
 tests/ui/coroutine/async_gen_fn.e2024.stderr  |   1 +
 tests/ui/coroutine/gen_block.e2024.stderr     |   1 +
 tests/ui/coroutine/gen_block.none.stderr      |   2 +
 tests/ui/coroutine/gen_fn.e2024.stderr        |   1 +
 .../feature-gate-diagnostic_namespace.stderr  |   2 +
 ...re-gate-diagnostic_on_unimplemented.stderr |   1 +
 .../ui/dyn-star/feature-gate-dyn_star.stderr  |   1 +
 tests/ui/dyn-star/gated-span.stderr           |   1 +
 .../dyn-star/no-explicit-dyn-star-cast.stderr |   2 +
 tests/ui/error-codes/E0017.stderr             |   1 +
 tests/ui/error-codes/E0388.stderr             |   1 +
 tests/ui/error-codes/E0396.stderr             |   5 +
 tests/ui/error-codes/E0658.stderr             |   1 +
 tests/ui/explore-issue-38412.stderr           |   7 ++
 tests/ui/expr/if/attrs/stmt-expr-gated.stderr |   1 +
 ...extern-item-where-clauses-debug-ice.stderr |   1 +
 tests/ui/feature-gates/doc-rust-logo.stderr   |   1 +
 .../feature-gate-abi-avr-interrupt.stderr     |  14 +++
 .../feature-gate-abi-msp430-interrupt.stderr  |   7 ++
 .../feature-gate-abi-riscv-interrupt.stderr   |   6 +
 .../feature-gate-abi-x86-interrupt.stderr     |   7 ++
 .../ui/feature-gates/feature-gate-abi.stderr  |  19 +++
 .../feature-gate-abi_amdgpu_kernel.stderr     |   7 ++
 .../feature-gates/feature-gate-abi_ptx.stderr |   7 ++
 .../feature-gate-abi_unadjusted.stderr        |   1 +
 .../feature-gate-alloc-error-handler.stderr   |   1 +
 .../feature-gate-allocator_internals.stderr   |   1 +
 ...-allow-internal-unsafe-nested-macro.stderr |   1 +
 ...llow-internal-unstable-nested-macro.stderr |   1 +
 ...gate-allow-internal-unstable-struct.stderr |   1 +
 ...eature-gate-allow-internal-unstable.stderr |   1 +
 .../feature-gate-arbitrary-self-types.stderr  |   3 +
 ...te-arbitrary_self_types-raw-pointer.stderr |   3 +
 .../feature-gate-asm_const.stderr             |   2 +
 .../feature-gate-asm_experimental_arch.stderr |   1 +
 .../feature-gate-asm_unwind.stderr            |   1 +
 .../feature-gate-assoc-type-defaults.stderr   |   1 +
 ...ture-gate-associated_const_equality.stderr |   1 +
 ...feature-gate-associated_type_bounds.stderr |  13 ++
 .../feature-gate-auto-traits.stderr           |   2 +
 .../feature-gate-box_patterns.stderr          |   1 +
 .../feature-gate-builtin_syntax.stderr        |   1 +
 .../feature-gate-c_variadic.stderr            |   1 +
 .../feature-gate-cfg-relocation-model.stderr  |   1 +
 .../feature-gate-cfg-sanitizer_cfi.stderr     |   2 +
 .../feature-gate-cfg-target-abi.stderr        |   4 +
 .../feature-gate-cfg-target-compact.stderr    |   4 +
 ...g-target-has-atomic-equal-alignment.stderr |   6 +
 .../feature-gate-cfg-target-has-atomic.stderr |   6 +
 ...eature-gate-cfg-target-thread-local.stderr |   1 +
 .../feature-gate-cfg-version.stderr           |  15 +++
 .../feature-gate-cfg_overflow_checks.stderr   |   1 +
 .../feature-gate-cfg_sanitize.stderr          |   1 +
 .../feature-gate-cfi_encoding.stderr          |   1 +
 ...eature-gate-closure_lifetime_binder.stderr |   3 +
 .../feature-gate-closure_track_caller.stderr  |   3 +
 .../feature-gate-collapse_debuginfo.stderr    |   1 +
 .../feature-gate-compiler-builtins.stderr     |   1 +
 .../feature-gate-concat_bytes.stderr          |   1 +
 .../feature-gate-concat_idents.stderr         |   2 +
 .../feature-gate-concat_idents2.stderr        |   1 +
 .../feature-gate-concat_idents3.stderr        |   2 +
 .../feature-gate-coroutines.e2024.stderr      |   2 +
 .../feature-gate-coroutines.none.stderr       |   6 +
 .../feature-gate-coverage-attribute.stderr    |   1 +
 .../feature-gate-custom_mir.stderr            |   1 +
 ...feature-gate-custom_test_frameworks.stderr |   2 +
 .../feature-gate-decl_macro.stderr            |   1 +
 .../feature-gate-deprecated_safe.stderr       |   2 +
 .../feature-gates/feature-gate-doc_cfg.stderr |   1 +
 .../feature-gate-doc_masked.stderr            |   1 +
 .../feature-gate-doc_notable_trait.stderr     |   1 +
 ...eature-gate-exclusive-range-pattern.stderr |   1 +
 .../feature-gate-explicit_tail_calls.stderr   |   2 +
 .../feature-gate-extern_types.stderr          |   1 +
 .../feature-gate-ffi_const.stderr             |   1 +
 .../feature-gate-ffi_pure.stderr              |   1 +
 .../feature-gate-ffi_returns_twice.stderr     |   1 +
 .../feature-gate-fn_align.stderr              |   1 +
 .../feature-gate-format_args_nl.stderr        |   1 +
 .../feature-gate-fundamental.stderr           |   1 +
 .../feature-gate-gen_blocks.e2024.stderr      |   4 +
 ...ature-gate-generic_arg_infer.normal.stderr |   2 +
 ...e-generic_associated_types_extended.stderr |   1 +
 ...ature-gate-impl_trait_in_assoc_type.stderr |   3 +
 ...-gate-impl_trait_in_fn_trait_return.stderr |   2 +
 .../feature-gate-imported_main.stderr         |   1 +
 ...ture-gate-inherent_associated_types.stderr |   1 +
 .../feature-gate-inline_const.stderr          |   1 +
 .../feature-gate-inline_const_pat.stderr      |   1 +
 .../feature-gate-intrinsics.stderr            |   2 +
 .../feature-gate-is_sorted.stderr             |   4 +
 .../feature-gate-lang-items.stderr            |   1 +
 .../feature-gate-large-assignments.stderr     |   1 +
 .../feature-gate-link-arg-attribute.stderr    |   1 +
 .../feature-gate-link_cfg.stderr              |   1 +
 .../feature-gate-link_llvm_intrinsics.stderr  |   1 +
 .../feature-gates/feature-gate-linkage.stderr |   1 +
 .../feature-gate-lint-reasons.stderr          |   2 +
 .../feature-gate-log_syntax.stderr            |   1 +
 .../feature-gate-log_syntax2.stderr           |   1 +
 .../feature-gate-marker_trait_attr.stderr     |   1 +
 .../feature-gate-may-dangle.stderr            |   1 +
 .../feature-gate-more-qualified-paths.stderr  |   3 +
 ...gate-multiple_supertrait_upcastable.stderr |   2 +
 .../feature-gate-naked_functions.stderr       |   2 +
 ...ate-native_link_modifiers_as_needed.stderr |   1 +
 .../feature-gate-needs-allocator.stderr       |   1 +
 .../feature-gate-never_patterns.stderr        |   6 +
 .../feature-gate-never_type.stderr            |   5 +
 .../feature-gates/feature-gate-no_core.stderr |   1 +
 .../feature-gate-no_sanitize.stderr           |   1 +
 ...on_exhaustive_omitted_patterns_lint.stderr |   6 +
 .../feature-gate-non_lifetime_binders.stderr  |   1 +
 .../feature-gate-offset-of-enum.stderr        |   2 +
 ...ate-omit-gdb-pretty-printer-section.stderr |   1 +
 .../feature-gate-optimize_attribute.stderr    |   5 +
 .../feature-gate-prelude_import.stderr        |   1 +
 ...ture-gate-proc_macro_byte_character.stderr |   1 +
 .../feature-gate-profiler-runtime.stderr      |   1 +
 .../feature-gate-register_tool.stderr         |   1 +
 .../feature-gate-repr-simd.stderr             |   2 +
 .../feature-gates/feature-gate-repr128.stderr |   1 +
 ...ature-gate-return_type_notation.cfg.stderr |   1 +
 ...eature-gate-return_type_notation.no.stderr |   1 +
 .../feature-gate-rust_cold_cc.stderr          |   7 ++
 ...-gate-rustc-allow-const-fn-unstable.stderr |   1 +
 .../feature-gate-rustc-attrs-1.stderr         |   3 +
 .../feature-gate-rustc-attrs.stderr           |   1 +
 .../feature-gate-rustdoc_internals.stderr     |   2 +
 .../ui/feature-gates/feature-gate-simd.stderr |   1 +
 .../feature-gates/feature-gate-start.stderr   |   1 +
 .../feature-gate-stmt_expr_attributes.stderr  |   1 +
 .../feature-gate-strict_provenance.stderr     |   2 +
 .../feature-gate-test_unstable_lint.stderr    |   1 +
 .../feature-gate-thread_local.stderr          |   1 +
 .../feature-gate-trace_macros.stderr          |   1 +
 .../feature-gate-trait-alias.stderr           |   1 +
 .../feature-gate-transparent_unions.stderr    |   1 +
 .../feature-gate-try_blocks.stderr            |   1 +
 .../feature-gate-type_ascription.stderr       |   1 +
 .../feature-gate-type_privacy_lints.stderr    |   1 +
 ...-gate-unboxed-closures-manual-impls.stderr |   7 ++
 ...-gate-unboxed-closures-method-calls.stderr |   3 +
 ...re-gate-unboxed-closures-ufcs-calls.stderr |   3 +
 .../feature-gate-unboxed-closures.stderr      |   2 +
 .../feature-gate-unix_sigpipe.stderr          |   1 +
 .../feature-gate-unnamed_fields.stderr        |   5 +
 ...feature-gate-unsized_tuple_coercion.stderr |   1 +
 .../feature-gate-used_with_arg.stderr         |   2 +
 .../feature-gate-vectorcall.stderr            |   7 ++
 .../feature-gate-wasm_abi.stderr              |   7 ++
 .../feature-gate-yeet_expr-in-cfg.stderr      |   2 +
 .../feature-gate-yeet_expr.stderr             |   2 +
 .../feature-gated-feature-in-macro-arg.stderr |   1 +
 ...sue-43106-gating-of-builtin-attrs-error.rs |   1 +
 ...43106-gating-of-builtin-attrs-error.stderr |  73 +++++------
 .../issue-43106-gating-of-derive.stderr       |   1 +
 .../issue-49983-see-issue-0.stderr            |   1 +
 tests/ui/feature-gates/rustc-private.stderr   |   1 +
 .../soft-syntax-gates-with-errors.stderr      |   2 +
 .../soft-syntax-gates-without-errors.stderr   |   2 +
 .../ui/feature-gates/trace_macros-gate.stderr |   4 +
 .../feature-gate-generic_const_items.stderr   |   8 ++
 ...-half-open-range-patterns-in-slices.stderr |   1 +
 .../range_pat_interactions1.stderr            |   2 +
 .../range_pat_interactions3.stderr            |   5 +
 .../slice_pattern_syntax_problem1.stderr      |   3 +
 .../trait-bounds/hrtb-wrong-kind.stderr       |   2 +
 .../ui/impl-trait/issues/issue-78722-2.stderr |   1 +
 tests/ui/impl-trait/issues/issue-78722.stderr |   1 +
 tests/ui/impl-trait/where-allowed.stderr      |   3 +
 tests/ui/imports/issue-37887.stderr           |   1 +
 .../inference_unstable_forced.stderr          |   1 +
 .../internal/internal-unstable-noallow.stderr |   4 +
 .../internal-unstable-thread-local.stderr     |   1 +
 tests/ui/internal/internal-unstable.stderr    |   5 +
 .../feature-gate-safe-intrinsic.stderr        |   1 +
 .../intrinsics/unchecked_math_unstable.stderr |   3 +
 tests/ui/issues/issue-20313.stderr            |   1 +
 tests/ui/issues/issue-23024.stderr            |   1 +
 tests/ui/issues/issue-32782.stderr            |   1 +
 tests/ui/issues/issue-50582.stderr            |   1 +
 tests/ui/issues/issue-50585.stderr            |   1 +
 tests/ui/issues/issue-52489.stderr            |   1 +
 tests/ui/lang-items/issue-83471.stderr        |   2 +
 tests/ui/linkage-attr/linkage4.stderr         |   1 +
 tests/ui/lint/lint-output-format.stderr       |   4 +
 tests/ui/lint/lint-stability-2.stderr         |  32 +++++
 tests/ui/lint/lint-stability-fields.stderr    |  43 +++++++
 tests/ui/lint/lint-stability.stderr           |  43 +++++++
 .../feature-gate-must_not_suspend.stderr      |   1 +
 tests/ui/lint/must_not_suspend/gated.stderr   |   1 +
 .../expect_missing_feature_gate.stderr        |   1 +
 .../unused-doc-comments-edge-cases.stderr     |   1 +
 tests/ui/macros/issue-68060.rs                |   1 +
 tests/ui/macros/issue-68060.stderr            |   1 +
 tests/ui/macros/macro-stability.stderr        |   3 +
 .../required-feature.stderr                   |  10 ++
 tests/ui/never_type/issue-52443.stderr        |   2 +
 tests/ui/offset-of/offset-of-unstable.stderr  |   8 ++
 .../feature-gate-on-unimplemented.stderr      |   1 +
 .../or-patterns-syntactic-pass.stderr         |   1 +
 tests/ui/panic-runtime/needs-gate.stderr      |   2 +
 ...-before-generic-args-syntactic-pass.stderr |   2 +
 ...mpl-item-type-no-body-semantic-fail.stderr |   4 +
 .../ui/parser/issues/issue-118531-ice.stderr  |   1 +
 .../recover-assoc-const-constraint.stderr     |   2 +
 .../recover/recover-quantified-closure.stderr |   2 +
 ...tern-meant-to-be-slice-rest-pattern.stderr |   1 +
 tests/ui/pattern/rest-pat-syntactic.stderr    |   2 +
 .../issue-119493-type-error-ice.stderr        |   1 +
 .../issue-119778-type-error-ice.stderr        |   1 +
 .../ui/pin-macro/cant_access_internals.stderr |   1 +
 tests/ui/proc-macro/attr-stmt-expr.stderr     |   2 +
 .../attributes-on-modules-fail.stderr         |   4 +
 tests/ui/proc-macro/expand-to-unstable.stderr |   1 +
 .../inner-attr-non-inline-mod.stderr          |   3 +
 tests/ui/proc-macro/issue-83510.stderr        |   1 +
 tests/ui/proc-macro/proc-macro-gates.stderr   |   8 ++
 tests/ui/raw-ref-op/feature-raw-ref-op.stderr |   6 +
 .../repr/explicit-rust-repr-conflicts.stderr  |   1 +
 .../ICE-119271-never-arm-attr-in-guard.stderr |   2 +
 .../feature-gate.no_gate.stderr               |   2 +
 .../rfc-2294-if-let-guard/feature-gate.stderr |  11 ++
 .../feature-gate-target_feature_11.stderr     |   1 +
 .../unstable-feature.stderr                   |   1 +
 .../feature-gate.stderr                       |   8 ++
 .../rfc-2497-if-let-chains/issue-93150.stderr |   2 +
 .../feature-gate.stderr                       |   1 +
 .../const_derives/derive-const-gate.stderr    |   1 +
 .../ice-112822-expected-type-for-param.stderr |   1 +
 .../feature-gate.stock.stderr                 |   6 +
 .../rfc-2632-const-trait-impl/gate.stderr     |   2 +
 .../hir-const-check.stderr                    |   1 +
 ...-trait-bound-theoretical-regression.stderr |   1 +
 .../tilde-const-invalid-places.stderr         |   5 +
 .../rustdoc/feature-gate-doc_primitive.stderr |   1 +
 ...ary-self-from-method-substs.default.stderr |   1 +
 .../ui/span/gated-features-attr-spans.stderr  |   1 +
 ...specialization-feature-gate-default.stderr |   1 +
 ...specialization-feature-gate-default.stderr |   1 +
 .../accidental-stable-in-unstable.stderr      |   1 +
 .../allow-unstable-reexport.stderr            |   3 +
 .../allowed-through-unstable.stderr           |   1 +
 .../default-body-stability-err.stderr         |   4 +
 .../generics-default-stability-trait.stderr   |   3 +
 .../generics-default-stability-where.stderr   |   1 +
 .../generics-default-stability.stderr         |  28 +++++
 .../ui/stability-attribute/issue-28075.stderr |   1 +
 .../stability-attribute/issue-28388-3.stderr  |   1 +
 ...bility-attribute-implies-no-feature.stderr |   2 +
 .../stability-attribute-issue.stderr          |   2 +
 .../stable-in-unstable.stderr                 |   6 +
 .../suggest-vec-allocator-api.stderr          |   4 +
 tests/ui/stmt_expr_attrs_no_feature.stderr    |   9 ++
 tests/ui/suggestions/fn-trait-notation.stderr |   3 +
 .../impl-trait-missing-lifetime-gated.stderr  |   8 ++
 tests/ui/suggestions/missing-assoc-fn.stderr  |   1 +
 ...-ascription-instead-of-path-in-type.stderr |   1 +
 tests/ui/target-feature/gate.stderr           |   1 +
 tests/ui/target-feature/invalid-attribute.rs  |   2 +
 .../target-feature/invalid-attribute.stderr   |  32 ++---
 .../thread-local/thread-local-static.stderr   |   2 +
 .../ui/tool-attributes/diagnostic_item.stderr |   1 +
 tests/ui/track-diagnostics/track6.stderr      |   1 +
 .../alias/generic-default-in-dyn.stderr       |   1 +
 .../rustc_must_implement_one_of_gated.stderr  |   1 +
 tests/ui/traits/issue-78372.stderr            |   2 +
 .../feature-gate-negative_impls.stderr        |   1 +
 .../dont-ice-on-assoc-projection.stderr       |   1 +
 .../feature-missing.stderr                    |   2 +
 .../type-alias-impl-trait/issue-60371.stderr  |   1 +
 tests/ui/typeck/issue-105946.stderr           |   1 +
 .../unboxed-closure-feature-gate.stderr       |   1 +
 ...nboxed-closure-sugar-not-used-on-fn.stderr |   2 +
 .../deny-unstable-lint-command-line.stderr    |   1 +
 .../deny-unstable-lint-inline.stderr          |   1 +
 ...-unknown-unstable-lint-command-line.stderr |   1 +
 .../warn-unknown-unstable-lint-inline.stderr  |   1 +
 tests/ui/unsafe/ranged_ints2_const.stderr     |   3 +
 tests/ui/unsafe/ranged_ints3_const.stderr     |   2 +
 406 files changed, 1363 insertions(+), 318 deletions(-)

diff --git a/tests/rustdoc-ui/feature-gate-custom_code_classes_in_docs.rs b/tests/rustdoc-ui/feature-gate-custom_code_classes_in_docs.rs
index 99263a944f810..1e7cdfc9ba7a8 100644
--- a/tests/rustdoc-ui/feature-gate-custom_code_classes_in_docs.rs
+++ b/tests/rustdoc-ui/feature-gate-custom_code_classes_in_docs.rs
@@ -6,6 +6,7 @@
 //~^^^ WARNING custom classes in code blocks will change behaviour
 //~| NOTE found these custom classes: class=language-c
 //~| NOTE see issue #79483 <https://github.com/rust-lang/rust/issues/79483>
+//~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 //~| HELP add `#![feature(custom_code_classes_in_docs)]` to the crate attributes to enable
 pub struct Bar;
 
diff --git a/tests/rustdoc-ui/feature-gate-custom_code_classes_in_docs.stderr b/tests/rustdoc-ui/feature-gate-custom_code_classes_in_docs.stderr
index 1a2360d9b3004..822806997c26c 100644
--- a/tests/rustdoc-ui/feature-gate-custom_code_classes_in_docs.stderr
+++ b/tests/rustdoc-ui/feature-gate-custom_code_classes_in_docs.stderr
@@ -8,6 +8,7 @@ LL | | /// ```
    |
    = note: see issue #79483 <https://github.com/rust-lang/rust/issues/79483> for more information
    = help: add `#![feature(custom_code_classes_in_docs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: found these custom classes: class=language-c
 
 warning: 1 warning emitted
diff --git a/tests/rustdoc-ui/feature-gate-doc_cfg_hide.stderr b/tests/rustdoc-ui/feature-gate-doc_cfg_hide.stderr
index 0b982cd9fd3d6..55135986ffe76 100644
--- a/tests/rustdoc-ui/feature-gate-doc_cfg_hide.stderr
+++ b/tests/rustdoc-ui/feature-gate-doc_cfg_hide.stderr
@@ -6,6 +6,7 @@ LL | #![doc(cfg_hide(test))]
    |
    = note: see issue #43781 <https://github.com/rust-lang/rust/issues/43781> for more information
    = help: add `#![feature(doc_cfg_hide)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/rustdoc-ui/intra-doc/feature-gate-intra-doc-pointers.stderr b/tests/rustdoc-ui/intra-doc/feature-gate-intra-doc-pointers.stderr
index 2c946ed48db17..1245bc15bb09b 100644
--- a/tests/rustdoc-ui/intra-doc/feature-gate-intra-doc-pointers.stderr
+++ b/tests/rustdoc-ui/intra-doc/feature-gate-intra-doc-pointers.stderr
@@ -6,6 +6,7 @@ LL | //! [pointer::add]
    |
    = note: see issue #80896 <https://github.com/rust-lang/rust/issues/80896> for more information
    = help: add `#![feature(intra_doc_pointers)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: rustdoc does not allow disambiguating between `*const` and `*mut`, and pointers are unstable until it does
 
 error[E0658]: linking to associated items of raw pointers is experimental
@@ -16,6 +17,7 @@ LL | //! [pointer::wrapping_add]
    |
    = note: see issue #80896 <https://github.com/rust-lang/rust/issues/80896> for more information
    = help: add `#![feature(intra_doc_pointers)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: rustdoc does not allow disambiguating between `*const` and `*mut`, and pointers are unstable until it does
 
 error: aborting due to 2 previous errors
diff --git a/tests/rustdoc-ui/lints/feature-gate-rustdoc_missing_doc_code_examples.rs b/tests/rustdoc-ui/lints/feature-gate-rustdoc_missing_doc_code_examples.rs
index ce94a06c39eae..832f129fab2db 100644
--- a/tests/rustdoc-ui/lints/feature-gate-rustdoc_missing_doc_code_examples.rs
+++ b/tests/rustdoc-ui/lints/feature-gate-rustdoc_missing_doc_code_examples.rs
@@ -5,3 +5,4 @@
 //~^ ERROR unknown lint
 //~| NOTE lint is unstable
 //~| NOTE see issue
+//~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
diff --git a/tests/rustdoc-ui/lints/feature-gate-rustdoc_missing_doc_code_examples.stderr b/tests/rustdoc-ui/lints/feature-gate-rustdoc_missing_doc_code_examples.stderr
index f188240062dbc..67540949f4d7e 100644
--- a/tests/rustdoc-ui/lints/feature-gate-rustdoc_missing_doc_code_examples.stderr
+++ b/tests/rustdoc-ui/lints/feature-gate-rustdoc_missing_doc_code_examples.stderr
@@ -7,6 +7,7 @@ LL | #![allow(rustdoc::missing_doc_code_examples)]
    = note: the `rustdoc::missing_doc_code_examples` lint is unstable
    = note: see issue #101730 <https://github.com/rust-lang/rust/issues/101730> for more information
    = help: add `#![feature(rustdoc_missing_doc_code_examples)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 note: the lint level is defined here
   --> $DIR/feature-gate-rustdoc_missing_doc_code_examples.rs:2:9
    |
diff --git a/tests/ui-fulldeps/hash-stable-is-unstable.rs b/tests/ui-fulldeps/hash-stable-is-unstable.rs
index 37d7472ec6097..ab18f2c6415e4 100644
--- a/tests/ui-fulldeps/hash-stable-is-unstable.rs
+++ b/tests/ui-fulldeps/hash-stable-is-unstable.rs
@@ -1,16 +1,31 @@
+// ignore-stage1
 // compile-flags: -Zdeduplicate-diagnostics=yes
 extern crate rustc_data_structures;
 //~^ use of unstable library feature 'rustc_private'
+//~| NOTE: issue #27812 <https://github.com/rust-lang/rust/issues/27812> for more information
+//~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 extern crate rustc_macros;
 //~^ use of unstable library feature 'rustc_private'
+//~| NOTE: see issue #27812 <https://github.com/rust-lang/rust/issues/27812> for more information
+//~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 extern crate rustc_query_system;
 //~^ use of unstable library feature 'rustc_private'
+//~| NOTE: see issue #27812 <https://github.com/rust-lang/rust/issues/27812> for more information
+//~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 use rustc_macros::HashStable;
 //~^ use of unstable library feature 'rustc_private'
+//~| NOTE: see issue #27812 <https://github.com/rust-lang/rust/issues/27812> for more information
+//~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 #[derive(HashStable)]
 //~^ use of unstable library feature 'rustc_private'
+//~| NOTE: in this expansion of #[derive(HashStable)]
+//~| NOTE: in this expansion of #[derive(HashStable)]
+//~| NOTE: in this expansion of #[derive(HashStable)]
+//~| NOTE: in this expansion of #[derive(HashStable)]
+//~| NOTE: see issue #27812 <https://github.com/rust-lang/rust/issues/27812> for more information
+//~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 struct Test;
 
 fn main() {}
diff --git a/tests/ui-fulldeps/hash-stable-is-unstable.stderr b/tests/ui-fulldeps/hash-stable-is-unstable.stderr
index 1a8994d722ea0..818bdaedccad2 100644
--- a/tests/ui-fulldeps/hash-stable-is-unstable.stderr
+++ b/tests/ui-fulldeps/hash-stable-is-unstable.stderr
@@ -1,47 +1,52 @@
 error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead?
-  --> $DIR/hash-stable-is-unstable.rs:2:1
+  --> $DIR/hash-stable-is-unstable.rs:3:1
    |
 LL | extern crate rustc_data_structures;
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #27812 <https://github.com/rust-lang/rust/issues/27812> for more information
    = help: add `#![feature(rustc_private)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead?
-  --> $DIR/hash-stable-is-unstable.rs:4:1
+  --> $DIR/hash-stable-is-unstable.rs:7:1
    |
 LL | extern crate rustc_macros;
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #27812 <https://github.com/rust-lang/rust/issues/27812> for more information
    = help: add `#![feature(rustc_private)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead?
-  --> $DIR/hash-stable-is-unstable.rs:6:1
+  --> $DIR/hash-stable-is-unstable.rs:11:1
    |
 LL | extern crate rustc_query_system;
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #27812 <https://github.com/rust-lang/rust/issues/27812> for more information
    = help: add `#![feature(rustc_private)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead?
-  --> $DIR/hash-stable-is-unstable.rs:9:5
+  --> $DIR/hash-stable-is-unstable.rs:16:5
    |
 LL | use rustc_macros::HashStable;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #27812 <https://github.com/rust-lang/rust/issues/27812> for more information
    = help: add `#![feature(rustc_private)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead?
-  --> $DIR/hash-stable-is-unstable.rs:12:10
+  --> $DIR/hash-stable-is-unstable.rs:21:10
    |
 LL | #[derive(HashStable)]
    |          ^^^^^^^^^^
    |
    = note: see issue #27812 <https://github.com/rust-lang/rust/issues/27812> for more information
    = help: add `#![feature(rustc_private)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the derive macro `HashStable` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 5 previous errors
diff --git a/tests/ui-fulldeps/pathless-extern-unstable.rs b/tests/ui-fulldeps/pathless-extern-unstable.rs
index 7fba8343bc088..719ca3c5a65b0 100644
--- a/tests/ui-fulldeps/pathless-extern-unstable.rs
+++ b/tests/ui-fulldeps/pathless-extern-unstable.rs
@@ -1,4 +1,5 @@
 // edition:2018
+// ignore-stage1
 // compile-flags:--extern rustc_middle
 
 // Test that `--extern rustc_middle` fails with `rustc_private`.
diff --git a/tests/ui-fulldeps/pathless-extern-unstable.stderr b/tests/ui-fulldeps/pathless-extern-unstable.stderr
index cfd8669c45fed..d13a007921317 100644
--- a/tests/ui-fulldeps/pathless-extern-unstable.stderr
+++ b/tests/ui-fulldeps/pathless-extern-unstable.stderr
@@ -1,11 +1,12 @@
 error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead?
-  --> $DIR/pathless-extern-unstable.rs:6:9
+  --> $DIR/pathless-extern-unstable.rs:7:9
    |
 LL | pub use rustc_middle;
    |         ^^^^^^^^^^^^
    |
    = note: see issue #27812 <https://github.com/rust-lang/rust/issues/27812> for more information
    = help: add `#![feature(rustc_private)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/array-slice-vec/suggest-array-length.stderr b/tests/ui/array-slice-vec/suggest-array-length.stderr
index 16c90a04784d0..fdab7ba7064e4 100644
--- a/tests/ui/array-slice-vec/suggest-array-length.stderr
+++ b/tests/ui/array-slice-vec/suggest-array-length.stderr
@@ -48,6 +48,7 @@ LL |     const Foo: [i32; _] = [1, 2, 3];
    |
    = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
    = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: using `_` for array lengths is unstable
   --> $DIR/suggest-array-length.rs:8:26
@@ -57,6 +58,7 @@ LL |     const REF_FOO: &[u8; _] = &[1];
    |
    = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
    = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: using `_` for array lengths is unstable
   --> $DIR/suggest-array-length.rs:11:20
@@ -66,6 +68,7 @@ LL |     let foo: [i32; _] = [1, 2, 3];
    |
    = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
    = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: using `_` for array lengths is unstable
   --> $DIR/suggest-array-length.rs:14:20
@@ -75,6 +78,7 @@ LL |     let bar: [i32; _] = [0; 3];
    |
    = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
    = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: using `_` for array lengths is unstable
   --> $DIR/suggest-array-length.rs:17:25
@@ -84,6 +88,7 @@ LL |     let ref_foo: &[i32; _] = &[1, 2, 3];
    |
    = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
    = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: using `_` for array lengths is unstable
   --> $DIR/suggest-array-length.rs:20:25
@@ -93,6 +98,7 @@ LL |     let ref_bar: &[i32; _] = &[0; 3];
    |
    = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
    = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: using `_` for array lengths is unstable
   --> $DIR/suggest-array-length.rs:23:35
@@ -102,6 +108,7 @@ LL |     let multiple_ref_foo: &&[i32; _] = &&[1, 2, 3];
    |
    = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
    = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 14 previous errors
 
diff --git a/tests/ui/associated-consts/issue-105330.stderr b/tests/ui/associated-consts/issue-105330.stderr
index e1461fec296e0..b4c021d0f4fdc 100644
--- a/tests/ui/associated-consts/issue-105330.stderr
+++ b/tests/ui/associated-consts/issue-105330.stderr
@@ -23,6 +23,7 @@ LL | fn foo<A: TraitWAssocConst<A=32>>() {
    |
    = note: see issue #92827 <https://github.com/rust-lang/rust/issues/92827> for more information
    = help: add `#![feature(associated_const_equality)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: associated const equality is incomplete
   --> $DIR/issue-105330.rs:15:29
@@ -32,6 +33,7 @@ LL | fn main<A: TraitWAssocConst<A=32>>() {
    |
    = note: see issue #92827 <https://github.com/rust-lang/rust/issues/92827> for more information
    = help: add `#![feature(associated_const_equality)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0562]: `impl Trait` is not allowed in impl headers
   --> $DIR/issue-105330.rs:6:27
diff --git a/tests/ui/associated-consts/issue-93835.stderr b/tests/ui/associated-consts/issue-93835.stderr
index be0573a1301af..d3ce46f6f03fb 100644
--- a/tests/ui/associated-consts/issue-93835.stderr
+++ b/tests/ui/associated-consts/issue-93835.stderr
@@ -24,6 +24,7 @@ LL |     type_ascribe!(p, a<p:p<e=6>>);
    |
    = note: see issue #92827 <https://github.com/rust-lang/rust/issues/92827> for more information
    = help: add `#![feature(associated_const_equality)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: associated type bounds are unstable
   --> $DIR/issue-93835.rs:4:24
@@ -33,6 +34,7 @@ LL |     type_ascribe!(p, a<p:p<e=6>>);
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 5 previous errors
 
diff --git a/tests/ui/associated-inherent-types/assoc-inherent-unstable.stderr b/tests/ui/associated-inherent-types/assoc-inherent-unstable.stderr
index cf2aee6ab53e0..ab8cdb6f80a48 100644
--- a/tests/ui/associated-inherent-types/assoc-inherent-unstable.stderr
+++ b/tests/ui/associated-inherent-types/assoc-inherent-unstable.stderr
@@ -5,6 +5,7 @@ LL | type Data = aux::Owner::Data;
    |             ^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(data)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/associated-inherent-types/dont-select-if-disabled.stderr b/tests/ui/associated-inherent-types/dont-select-if-disabled.stderr
index 87a3f35c9685a..edf54894cd4e1 100644
--- a/tests/ui/associated-inherent-types/dont-select-if-disabled.stderr
+++ b/tests/ui/associated-inherent-types/dont-select-if-disabled.stderr
@@ -17,6 +17,7 @@ LL | impl S { type P = (); }
    |
    = note: see issue #8995 <https://github.com/rust-lang/rust/issues/8995> for more information
    = help: add `#![feature(inherent_associated_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/associated-inherent-types/issue-109071.no_gate.stderr b/tests/ui/associated-inherent-types/issue-109071.no_gate.stderr
index e3eddf489b04e..b8366b15a8ae4 100644
--- a/tests/ui/associated-inherent-types/issue-109071.no_gate.stderr
+++ b/tests/ui/associated-inherent-types/issue-109071.no_gate.stderr
@@ -28,6 +28,7 @@ LL |     type Item = &[T];
    |
    = note: see issue #8995 <https://github.com/rust-lang/rust/issues/8995> for more information
    = help: add `#![feature(inherent_associated_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0223]: ambiguous associated type
   --> $DIR/issue-109071.rs:15:22
diff --git a/tests/ui/associated-inherent-types/issue-109768.stderr b/tests/ui/associated-inherent-types/issue-109768.stderr
index c489fd1ab9b09..e960f4fb5d173 100644
--- a/tests/ui/associated-inherent-types/issue-109768.stderr
+++ b/tests/ui/associated-inherent-types/issue-109768.stderr
@@ -28,6 +28,7 @@ LL |     type AssocType3 = T;
    |
    = note: see issue #8995 <https://github.com/rust-lang/rust/issues/8995> for more information
    = help: add `#![feature(inherent_associated_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0061]: this struct takes 1 argument but 0 arguments were supplied
   --> $DIR/issue-109768.rs:10:56
diff --git a/tests/ui/associated-type-bounds/issue-99828.stderr b/tests/ui/associated-type-bounds/issue-99828.stderr
index 8813baf84de45..911f3ff0f5ed5 100644
--- a/tests/ui/associated-type-bounds/issue-99828.stderr
+++ b/tests/ui/associated-type-bounds/issue-99828.stderr
@@ -6,6 +6,7 @@ LL | fn get_iter(vec: &[i32]) -> impl Iterator<Item = {}> + '_ {
    |
    = note: see issue #92827 <https://github.com/rust-lang/rust/issues/92827> for more information
    = help: add `#![feature(associated_const_equality)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: expected type, found constant
   --> $DIR/issue-99828.rs:1:50
diff --git a/tests/ui/associated-type-bounds/return-type-notation/bad-inputs-and-output.stderr b/tests/ui/associated-type-bounds/return-type-notation/bad-inputs-and-output.stderr
index 1714dac12db97..02bec24c628de 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/bad-inputs-and-output.stderr
+++ b/tests/ui/associated-type-bounds/return-type-notation/bad-inputs-and-output.stderr
@@ -12,6 +12,7 @@ LL | fn foo<T: Trait<method(i32): Send>>() {}
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: associated type bounds are unstable
   --> $DIR/bad-inputs-and-output.rs:14:17
@@ -21,6 +22,7 @@ LL | fn bar<T: Trait<method() -> (): Send>>() {}
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
   --> $DIR/bad-inputs-and-output.rs:3:12
diff --git a/tests/ui/associated-type-bounds/return-type-notation/unpretty-parenthesized.stderr b/tests/ui/associated-type-bounds/return-type-notation/unpretty-parenthesized.stderr
index f27603e3719df..3007240c3ab62 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/unpretty-parenthesized.stderr
+++ b/tests/ui/associated-type-bounds/return-type-notation/unpretty-parenthesized.stderr
@@ -6,6 +6,7 @@ LL | fn foo<T: Trait<method(i32): Send>>() {}
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/async-await/feature-async-closure.stderr b/tests/ui/async-await/feature-async-closure.stderr
index c69a0dd9ed98d..650500b489034 100644
--- a/tests/ui/async-await/feature-async-closure.stderr
+++ b/tests/ui/async-await/feature-async-closure.stderr
@@ -6,6 +6,7 @@ LL |     let _ = async || {};
    |
    = note: see issue #62290 <https://github.com/rust-lang/rust/issues/62290> for more information
    = help: add `#![feature(async_closure)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: to use an async block, remove the `||`: `async {`
 
 error: aborting due to 1 previous error
diff --git a/tests/ui/async-await/feature-async-for-loop.stderr b/tests/ui/async-await/feature-async-for-loop.stderr
index 38f75821772c8..62ddc4222b85e 100644
--- a/tests/ui/async-await/feature-async-for-loop.stderr
+++ b/tests/ui/async-await/feature-async-for-loop.stderr
@@ -6,6 +6,7 @@ LL |         for await _i in core::async_iter::from_iter(0..3) {
    |
    = note: see issue #118898 <https://github.com/rust-lang/rust/issues/118898> for more information
    = help: add `#![feature(async_for_loop)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `for await` loops are experimental
   --> $DIR/feature-async-for-loop.rs:17:13
@@ -15,6 +16,7 @@ LL |         for await _i in core::async_iter::from_iter(0..3) {
    |
    = note: see issue #118898 <https://github.com/rust-lang/rust/issues/118898> for more information
    = help: add `#![feature(async_for_loop)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/async-await/issues/issue-95307.stderr b/tests/ui/async-await/issues/issue-95307.stderr
index fdc6d5de1a80b..dd8fcd3690a71 100644
--- a/tests/ui/async-await/issues/issue-95307.stderr
+++ b/tests/ui/async-await/issues/issue-95307.stderr
@@ -12,6 +12,7 @@ LL |     async fn new() -> [u8; _];
    |
    = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
    = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/async-await/track-caller/async-block.afn.stderr b/tests/ui/async-await/track-caller/async-block.afn.stderr
index 2302722eecc4b..b6a7481a4d119 100644
--- a/tests/ui/async-await/track-caller/async-block.afn.stderr
+++ b/tests/ui/async-await/track-caller/async-block.afn.stderr
@@ -6,6 +6,7 @@ LL |     let _ = #[track_caller] async {
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `#[track_caller]` on closures is currently unstable
   --> $DIR/async-block.rs:15:13
@@ -15,6 +16,7 @@ LL |     let _ = #[track_caller] async {
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `#[track_caller]` on closures is currently unstable
   --> $DIR/async-block.rs:23:17
@@ -24,6 +26,7 @@ LL |         let _ = #[track_caller] async {
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/async-await/track-caller/async-block.nofeat.stderr b/tests/ui/async-await/track-caller/async-block.nofeat.stderr
index 2302722eecc4b..b6a7481a4d119 100644
--- a/tests/ui/async-await/track-caller/async-block.nofeat.stderr
+++ b/tests/ui/async-await/track-caller/async-block.nofeat.stderr
@@ -6,6 +6,7 @@ LL |     let _ = #[track_caller] async {
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `#[track_caller]` on closures is currently unstable
   --> $DIR/async-block.rs:15:13
@@ -15,6 +16,7 @@ LL |     let _ = #[track_caller] async {
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `#[track_caller]` on closures is currently unstable
   --> $DIR/async-block.rs:23:17
@@ -24,6 +26,7 @@ LL |         let _ = #[track_caller] async {
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/async-await/track-caller/async-closure-gate.afn.stderr b/tests/ui/async-await/track-caller/async-closure-gate.afn.stderr
index e23fc459358b3..92f38d5a79620 100644
--- a/tests/ui/async-await/track-caller/async-closure-gate.afn.stderr
+++ b/tests/ui/async-await/track-caller/async-closure-gate.afn.stderr
@@ -6,6 +6,7 @@ LL |     let _ = #[track_caller] async || {
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `#[track_caller]` on closures is currently unstable
   --> $DIR/async-closure-gate.rs:15:13
@@ -15,6 +16,7 @@ LL |     let _ = #[track_caller] async || {
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `#[track_caller]` on closures is currently unstable
   --> $DIR/async-closure-gate.rs:21:13
@@ -24,6 +26,7 @@ LL |     let _ = #[track_caller] || {
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `#[track_caller]` on closures is currently unstable
   --> $DIR/async-closure-gate.rs:29:17
@@ -33,6 +36,7 @@ LL |         let _ = #[track_caller] || {
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `#[track_caller]` on closures is currently unstable
   --> $DIR/async-closure-gate.rs:37:9
@@ -42,6 +46,7 @@ LL |         #[track_caller] || {
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `#[track_caller]` on closures is currently unstable
   --> $DIR/async-closure-gate.rs:47:13
@@ -51,6 +56,7 @@ LL |             #[track_caller] || {
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0308]: mismatched types
   --> $DIR/async-closure-gate.rs:27:5
diff --git a/tests/ui/async-await/track-caller/async-closure-gate.nofeat.stderr b/tests/ui/async-await/track-caller/async-closure-gate.nofeat.stderr
index e23fc459358b3..92f38d5a79620 100644
--- a/tests/ui/async-await/track-caller/async-closure-gate.nofeat.stderr
+++ b/tests/ui/async-await/track-caller/async-closure-gate.nofeat.stderr
@@ -6,6 +6,7 @@ LL |     let _ = #[track_caller] async || {
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `#[track_caller]` on closures is currently unstable
   --> $DIR/async-closure-gate.rs:15:13
@@ -15,6 +16,7 @@ LL |     let _ = #[track_caller] async || {
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `#[track_caller]` on closures is currently unstable
   --> $DIR/async-closure-gate.rs:21:13
@@ -24,6 +26,7 @@ LL |     let _ = #[track_caller] || {
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `#[track_caller]` on closures is currently unstable
   --> $DIR/async-closure-gate.rs:29:17
@@ -33,6 +36,7 @@ LL |         let _ = #[track_caller] || {
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `#[track_caller]` on closures is currently unstable
   --> $DIR/async-closure-gate.rs:37:9
@@ -42,6 +46,7 @@ LL |         #[track_caller] || {
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `#[track_caller]` on closures is currently unstable
   --> $DIR/async-closure-gate.rs:47:13
@@ -51,6 +56,7 @@ LL |             #[track_caller] || {
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0308]: mismatched types
   --> $DIR/async-closure-gate.rs:27:5
diff --git a/tests/ui/async-await/track-caller/panic-track-caller.cls.stderr b/tests/ui/async-await/track-caller/panic-track-caller.cls.stderr
index f3090e3b9a68f..464cbfba2acfe 100644
--- a/tests/ui/async-await/track-caller/panic-track-caller.cls.stderr
+++ b/tests/ui/async-await/track-caller/panic-track-caller.cls.stderr
@@ -11,6 +11,7 @@ LL | | }
    |
    = note: see issue #110011 <https://github.com/rust-lang/rust/issues/110011> for more information
    = help: add `#![feature(async_fn_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: `#[warn(ungated_async_fn_track_caller)]` on by default
 
 warning: `#[track_caller]` on async functions is a no-op
@@ -26,6 +27,7 @@ LL | |     }
    |
    = note: see issue #110011 <https://github.com/rust-lang/rust/issues/110011> for more information
    = help: add `#![feature(async_fn_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 warning: 2 warnings emitted
 
diff --git a/tests/ui/async-await/track-caller/panic-track-caller.nofeat.stderr b/tests/ui/async-await/track-caller/panic-track-caller.nofeat.stderr
index f3090e3b9a68f..464cbfba2acfe 100644
--- a/tests/ui/async-await/track-caller/panic-track-caller.nofeat.stderr
+++ b/tests/ui/async-await/track-caller/panic-track-caller.nofeat.stderr
@@ -11,6 +11,7 @@ LL | | }
    |
    = note: see issue #110011 <https://github.com/rust-lang/rust/issues/110011> for more information
    = help: add `#![feature(async_fn_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: `#[warn(ungated_async_fn_track_caller)]` on by default
 
 warning: `#[track_caller]` on async functions is a no-op
@@ -26,6 +27,7 @@ LL | |     }
    |
    = note: see issue #110011 <https://github.com/rust-lang/rust/issues/110011> for more information
    = help: add `#![feature(async_fn_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 warning: 2 warnings emitted
 
diff --git a/tests/ui/auto-traits/issue-117789.stderr b/tests/ui/auto-traits/issue-117789.stderr
index 9a3a7efed3e1e..1f8880b1ef460 100644
--- a/tests/ui/auto-traits/issue-117789.stderr
+++ b/tests/ui/auto-traits/issue-117789.stderr
@@ -14,6 +14,7 @@ LL | auto trait Trait<P> {}
    |
    = note: see issue #13231 <https://github.com/rust-lang/rust/issues/13231> for more information
    = help: add `#![feature(auto_traits)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/auto-traits/pre-cfg.stderr b/tests/ui/auto-traits/pre-cfg.stderr
index 6efa05b4326d5..648f9464d61df 100644
--- a/tests/ui/auto-traits/pre-cfg.stderr
+++ b/tests/ui/auto-traits/pre-cfg.stderr
@@ -6,6 +6,7 @@ LL | auto trait Foo {}
    |
    = note: see issue #13231 <https://github.com/rust-lang/rust/issues/13231> for more information
    = help: add `#![feature(auto_traits)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = warning: unstable syntax can change at any point in the future, causing a hard error!
    = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
 
diff --git a/tests/ui/bounds-lifetime.stderr b/tests/ui/bounds-lifetime.stderr
index de9b9e01242ce..01b314f3d1bb1 100644
--- a/tests/ui/bounds-lifetime.stderr
+++ b/tests/ui/bounds-lifetime.stderr
@@ -24,6 +24,7 @@ LL | type D = for<'a, T> fn();
    |
    = note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information
    = help: add `#![feature(non_lifetime_binders)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: only lifetime parameters can be used in this context
   --> $DIR/bounds-lifetime.rs:5:18
@@ -33,6 +34,7 @@ LL | type E = dyn for<T, U> Fn();
    |
    = note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information
    = help: add `#![feature(non_lifetime_binders)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 5 previous errors
 
diff --git a/tests/ui/box/alloc-unstable-fail.stderr b/tests/ui/box/alloc-unstable-fail.stderr
index 352efce318f3f..9e1e12a2b6aee 100644
--- a/tests/ui/box/alloc-unstable-fail.stderr
+++ b/tests/ui/box/alloc-unstable-fail.stderr
@@ -6,6 +6,7 @@ LL |     let _boxed: Box<u32, _> = Box::new(10);
    |
    = note: see issue #32838 <https://github.com/rust-lang/rust/issues/32838> for more information
    = help: add `#![feature(allocator_api)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/c-variadic/feature-gate-extended_varargs_abi_support.stderr b/tests/ui/c-variadic/feature-gate-extended_varargs_abi_support.stderr
index 5b97b396fb120..94e9628f0f0f6 100644
--- a/tests/ui/c-variadic/feature-gate-extended_varargs_abi_support.stderr
+++ b/tests/ui/c-variadic/feature-gate-extended_varargs_abi_support.stderr
@@ -6,6 +6,7 @@ LL | fn efiapi(f: extern "efiapi" fn(usize, ...)) {
    |
    = note: see issue #100189 <https://github.com/rust-lang/rust/issues/100189> for more information
    = help: add `#![feature(extended_varargs_abi_support)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0045]: C-variadic function must have a compatible calling convention, like `C` or `cdecl`
   --> $DIR/feature-gate-extended_varargs_abi_support.rs:1:14
@@ -21,6 +22,7 @@ LL | fn sysv(f: extern "sysv64" fn(usize, ...)) {
    |
    = note: see issue #100189 <https://github.com/rust-lang/rust/issues/100189> for more information
    = help: add `#![feature(extended_varargs_abi_support)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0045]: C-variadic function must have a compatible calling convention, like `C` or `cdecl`
   --> $DIR/feature-gate-extended_varargs_abi_support.rs:6:12
@@ -36,6 +38,7 @@ LL | fn win(f: extern "win64" fn(usize, ...)) {
    |
    = note: see issue #100189 <https://github.com/rust-lang/rust/issues/100189> for more information
    = help: add `#![feature(extended_varargs_abi_support)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0045]: C-variadic function must have a compatible calling convention, like `C` or `cdecl`
   --> $DIR/feature-gate-extended_varargs_abi_support.rs:11:11
diff --git a/tests/ui/cfg/cfg-false-feature.stderr b/tests/ui/cfg/cfg-false-feature.stderr
index 34093036205fe..9309b59ca591f 100644
--- a/tests/ui/cfg/cfg-false-feature.stderr
+++ b/tests/ui/cfg/cfg-false-feature.stderr
@@ -6,6 +6,7 @@ LL | trait A = Clone;
    |
    = note: see issue #41517 <https://github.com/rust-lang/rust/issues/41517> for more information
    = help: add `#![feature(trait_alias)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = warning: unstable syntax can change at any point in the future, causing a hard error!
    = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
 
@@ -17,6 +18,7 @@ LL |     let box _ = Box::new(0);
    |
    = note: see issue #29641 <https://github.com/rust-lang/rust/issues/29641> for more information
    = help: add `#![feature(box_patterns)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = warning: unstable syntax can change at any point in the future, causing a hard error!
    = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
 
diff --git a/tests/ui/closures/2229_closure_analysis/arrays-completely-captured.rs b/tests/ui/closures/2229_closure_analysis/arrays-completely-captured.rs
index 2bcbd792e3a83..191cb4c7236e0 100644
--- a/tests/ui/closures/2229_closure_analysis/arrays-completely-captured.rs
+++ b/tests/ui/closures/2229_closure_analysis/arrays-completely-captured.rs
@@ -8,6 +8,7 @@ fn main() {
     let mut c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/arrays-completely-captured.stderr b/tests/ui/closures/2229_closure_analysis/arrays-completely-captured.stderr
index 129b26456ce1d..d7582dcfcc740 100644
--- a/tests/ui/closures/2229_closure_analysis/arrays-completely-captured.stderr
+++ b/tests/ui/closures/2229_closure_analysis/arrays-completely-captured.stderr
@@ -6,9 +6,10 @@ LL |     let mut c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/arrays-completely-captured.rs:11:5
+  --> $DIR/arrays-completely-captured.rs:12:5
    |
 LL | /     || {
 LL | |
@@ -20,18 +21,18 @@ LL | |     };
    | |_____^
    |
 note: Capturing m[] -> MutBorrow
-  --> $DIR/arrays-completely-captured.rs:14:9
+  --> $DIR/arrays-completely-captured.rs:15:9
    |
 LL |         m[0] += 10;
    |         ^
 note: Capturing m[] -> MutBorrow
-  --> $DIR/arrays-completely-captured.rs:17:9
+  --> $DIR/arrays-completely-captured.rs:18:9
    |
 LL |         m[1] += 40;
    |         ^
 
 error: Min Capture analysis includes:
-  --> $DIR/arrays-completely-captured.rs:11:5
+  --> $DIR/arrays-completely-captured.rs:12:5
    |
 LL | /     || {
 LL | |
@@ -43,7 +44,7 @@ LL | |     };
    | |_____^
    |
 note: Min Capture m[] -> MutBorrow
-  --> $DIR/arrays-completely-captured.rs:14:9
+  --> $DIR/arrays-completely-captured.rs:15:9
    |
 LL |         m[0] += 10;
    |         ^
diff --git a/tests/ui/closures/2229_closure_analysis/by_value.rs b/tests/ui/closures/2229_closure_analysis/by_value.rs
index d8d3bbee200db..d3bde3cea6396 100644
--- a/tests/ui/closures/2229_closure_analysis/by_value.rs
+++ b/tests/ui/closures/2229_closure_analysis/by_value.rs
@@ -18,6 +18,7 @@ fn big_box() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ First Pass analysis includes:
     //~| Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/by_value.stderr b/tests/ui/closures/2229_closure_analysis/by_value.stderr
index 097462253aae7..0dd9991cf8402 100644
--- a/tests/ui/closures/2229_closure_analysis/by_value.stderr
+++ b/tests/ui/closures/2229_closure_analysis/by_value.stderr
@@ -6,9 +6,10 @@ LL |     let c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/by_value.rs:21:5
+  --> $DIR/by_value.rs:22:5
    |
 LL | /     || {
 LL | |
@@ -20,18 +21,18 @@ LL | |     };
    | |_____^
    |
 note: Capturing t[(0, 0),Deref,(0, 0)] -> ByValue
-  --> $DIR/by_value.rs:24:17
+  --> $DIR/by_value.rs:25:17
    |
 LL |         let p = t.0.0;
    |                 ^^^^^
 note: Capturing t[(1, 0)] -> ImmBorrow
-  --> $DIR/by_value.rs:27:29
+  --> $DIR/by_value.rs:28:29
    |
 LL |         println!("{} {:?}", t.1, p);
    |                             ^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/by_value.rs:21:5
+  --> $DIR/by_value.rs:22:5
    |
 LL | /     || {
 LL | |
@@ -43,12 +44,12 @@ LL | |     };
    | |_____^
    |
 note: Min Capture t[(0, 0)] -> ByValue
-  --> $DIR/by_value.rs:24:17
+  --> $DIR/by_value.rs:25:17
    |
 LL |         let p = t.0.0;
    |                 ^^^^^
 note: Min Capture t[(1, 0)] -> ImmBorrow
-  --> $DIR/by_value.rs:27:29
+  --> $DIR/by_value.rs:28:29
    |
 LL |         println!("{} {:?}", t.1, p);
    |                             ^^^
diff --git a/tests/ui/closures/2229_closure_analysis/capture-analysis-1.rs b/tests/ui/closures/2229_closure_analysis/capture-analysis-1.rs
index dc53b31768ec5..1a800b6b7f288 100644
--- a/tests/ui/closures/2229_closure_analysis/capture-analysis-1.rs
+++ b/tests/ui/closures/2229_closure_analysis/capture-analysis-1.rs
@@ -15,6 +15,7 @@ fn main() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ First Pass analysis includes:
     //~| Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/capture-analysis-1.stderr b/tests/ui/closures/2229_closure_analysis/capture-analysis-1.stderr
index fceafb9c84eeb..d2409c9367ce2 100644
--- a/tests/ui/closures/2229_closure_analysis/capture-analysis-1.stderr
+++ b/tests/ui/closures/2229_closure_analysis/capture-analysis-1.stderr
@@ -6,9 +6,10 @@ LL |     let c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/capture-analysis-1.rs:18:5
+  --> $DIR/capture-analysis-1.rs:19:5
    |
 LL | /     || {
 LL | |
@@ -20,28 +21,28 @@ LL | |     };
    | |_____^
    |
 note: Capturing p[] -> ImmBorrow
-  --> $DIR/capture-analysis-1.rs:21:26
+  --> $DIR/capture-analysis-1.rs:22:26
    |
 LL |         println!("{:?}", p);
    |                          ^
 note: Capturing p[(0, 0)] -> ImmBorrow
-  --> $DIR/capture-analysis-1.rs:24:26
+  --> $DIR/capture-analysis-1.rs:25:26
    |
 LL |         println!("{:?}", p.x);
    |                          ^^^
 note: Capturing q[(0, 0)] -> ImmBorrow
-  --> $DIR/capture-analysis-1.rs:27:26
+  --> $DIR/capture-analysis-1.rs:28:26
    |
 LL |         println!("{:?}", q.x);
    |                          ^^^
 note: Capturing q[] -> ImmBorrow
-  --> $DIR/capture-analysis-1.rs:29:26
+  --> $DIR/capture-analysis-1.rs:30:26
    |
 LL |         println!("{:?}", q);
    |                          ^
 
 error: Min Capture analysis includes:
-  --> $DIR/capture-analysis-1.rs:18:5
+  --> $DIR/capture-analysis-1.rs:19:5
    |
 LL | /     || {
 LL | |
@@ -53,12 +54,12 @@ LL | |     };
    | |_____^
    |
 note: Min Capture p[] -> ImmBorrow
-  --> $DIR/capture-analysis-1.rs:21:26
+  --> $DIR/capture-analysis-1.rs:22:26
    |
 LL |         println!("{:?}", p);
    |                          ^
 note: Min Capture q[] -> ImmBorrow
-  --> $DIR/capture-analysis-1.rs:29:26
+  --> $DIR/capture-analysis-1.rs:30:26
    |
 LL |         println!("{:?}", q);
    |                          ^
diff --git a/tests/ui/closures/2229_closure_analysis/capture-analysis-2.rs b/tests/ui/closures/2229_closure_analysis/capture-analysis-2.rs
index 99d12f8d8f1db..9b1825e904284 100644
--- a/tests/ui/closures/2229_closure_analysis/capture-analysis-2.rs
+++ b/tests/ui/closures/2229_closure_analysis/capture-analysis-2.rs
@@ -14,6 +14,7 @@ fn main() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ First Pass analysis includes:
     //~| Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/capture-analysis-2.stderr b/tests/ui/closures/2229_closure_analysis/capture-analysis-2.stderr
index cb44ca2665293..7049c708bb872 100644
--- a/tests/ui/closures/2229_closure_analysis/capture-analysis-2.stderr
+++ b/tests/ui/closures/2229_closure_analysis/capture-analysis-2.stderr
@@ -6,9 +6,10 @@ LL |     let c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/capture-analysis-2.rs:17:5
+  --> $DIR/capture-analysis-2.rs:18:5
    |
 LL | /     || {
 LL | |
@@ -20,18 +21,18 @@ LL | |     };
    | |_____^
    |
 note: Capturing p[(0, 0)] -> ByValue
-  --> $DIR/capture-analysis-2.rs:20:18
+  --> $DIR/capture-analysis-2.rs:21:18
    |
 LL |         let _x = p.x;
    |                  ^^^
 note: Capturing p[] -> ImmBorrow
-  --> $DIR/capture-analysis-2.rs:23:26
+  --> $DIR/capture-analysis-2.rs:24:26
    |
 LL |         println!("{:?}", p);
    |                          ^
 
 error: Min Capture analysis includes:
-  --> $DIR/capture-analysis-2.rs:17:5
+  --> $DIR/capture-analysis-2.rs:18:5
    |
 LL | /     || {
 LL | |
@@ -43,7 +44,7 @@ LL | |     };
    | |_____^
    |
 note: Min Capture p[] -> ByValue
-  --> $DIR/capture-analysis-2.rs:20:18
+  --> $DIR/capture-analysis-2.rs:21:18
    |
 LL |         let _x = p.x;
    |                  ^^^ p[] captured as ByValue here
diff --git a/tests/ui/closures/2229_closure_analysis/capture-analysis-3.rs b/tests/ui/closures/2229_closure_analysis/capture-analysis-3.rs
index 3f337097dbd2f..e9923a81bf634 100644
--- a/tests/ui/closures/2229_closure_analysis/capture-analysis-3.rs
+++ b/tests/ui/closures/2229_closure_analysis/capture-analysis-3.rs
@@ -19,6 +19,7 @@ fn main() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ First Pass analysis includes:
     //~| Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/capture-analysis-3.stderr b/tests/ui/closures/2229_closure_analysis/capture-analysis-3.stderr
index 71e7bdc354fb2..698b51a4fdb9b 100644
--- a/tests/ui/closures/2229_closure_analysis/capture-analysis-3.stderr
+++ b/tests/ui/closures/2229_closure_analysis/capture-analysis-3.stderr
@@ -6,9 +6,10 @@ LL |     let c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/capture-analysis-3.rs:22:5
+  --> $DIR/capture-analysis-3.rs:23:5
    |
 LL | /     || {
 LL | |
@@ -20,18 +21,18 @@ LL | |     };
    | |_____^
    |
 note: Capturing a[(0, 0),(0, 0)] -> ByValue
-  --> $DIR/capture-analysis-3.rs:25:18
+  --> $DIR/capture-analysis-3.rs:26:18
    |
 LL |         let _x = a.b.c;
    |                  ^^^^^
 note: Capturing a[(0, 0)] -> ImmBorrow
-  --> $DIR/capture-analysis-3.rs:28:26
+  --> $DIR/capture-analysis-3.rs:29:26
    |
 LL |         println!("{:?}", a.b);
    |                          ^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/capture-analysis-3.rs:22:5
+  --> $DIR/capture-analysis-3.rs:23:5
    |
 LL | /     || {
 LL | |
@@ -43,7 +44,7 @@ LL | |     };
    | |_____^
    |
 note: Min Capture a[(0, 0)] -> ByValue
-  --> $DIR/capture-analysis-3.rs:25:18
+  --> $DIR/capture-analysis-3.rs:26:18
    |
 LL |         let _x = a.b.c;
    |                  ^^^^^ a[(0, 0)] captured as ByValue here
diff --git a/tests/ui/closures/2229_closure_analysis/capture-analysis-4.rs b/tests/ui/closures/2229_closure_analysis/capture-analysis-4.rs
index bc46ec997360b..8c1963455a507 100644
--- a/tests/ui/closures/2229_closure_analysis/capture-analysis-4.rs
+++ b/tests/ui/closures/2229_closure_analysis/capture-analysis-4.rs
@@ -19,6 +19,7 @@ fn main() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ First Pass analysis includes:
     //~| Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/capture-analysis-4.stderr b/tests/ui/closures/2229_closure_analysis/capture-analysis-4.stderr
index 7e6e625bc7d48..9cd0dcf720e47 100644
--- a/tests/ui/closures/2229_closure_analysis/capture-analysis-4.stderr
+++ b/tests/ui/closures/2229_closure_analysis/capture-analysis-4.stderr
@@ -6,9 +6,10 @@ LL |     let c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/capture-analysis-4.rs:22:5
+  --> $DIR/capture-analysis-4.rs:23:5
    |
 LL | /     || {
 LL | |
@@ -20,18 +21,18 @@ LL | |     };
    | |_____^
    |
 note: Capturing a[(0, 0)] -> ByValue
-  --> $DIR/capture-analysis-4.rs:25:18
+  --> $DIR/capture-analysis-4.rs:26:18
    |
 LL |         let _x = a.b;
    |                  ^^^
 note: Capturing a[(0, 0),(0, 0)] -> ImmBorrow
-  --> $DIR/capture-analysis-4.rs:28:26
+  --> $DIR/capture-analysis-4.rs:29:26
    |
 LL |         println!("{:?}", a.b.c);
    |                          ^^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/capture-analysis-4.rs:22:5
+  --> $DIR/capture-analysis-4.rs:23:5
    |
 LL | /     || {
 LL | |
@@ -43,7 +44,7 @@ LL | |     };
    | |_____^
    |
 note: Min Capture a[(0, 0)] -> ByValue
-  --> $DIR/capture-analysis-4.rs:25:18
+  --> $DIR/capture-analysis-4.rs:26:18
    |
 LL |         let _x = a.b;
    |                  ^^^
diff --git a/tests/ui/closures/2229_closure_analysis/capture-disjoint-field-struct.rs b/tests/ui/closures/2229_closure_analysis/capture-disjoint-field-struct.rs
index 6fd1515533160..2bf127ed5e833 100644
--- a/tests/ui/closures/2229_closure_analysis/capture-disjoint-field-struct.rs
+++ b/tests/ui/closures/2229_closure_analysis/capture-disjoint-field-struct.rs
@@ -13,6 +13,7 @@ fn main() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ First Pass analysis includes:
     //~| Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/capture-disjoint-field-struct.stderr b/tests/ui/closures/2229_closure_analysis/capture-disjoint-field-struct.stderr
index 0f64ecf3a0ccb..92a719d6098d9 100644
--- a/tests/ui/closures/2229_closure_analysis/capture-disjoint-field-struct.stderr
+++ b/tests/ui/closures/2229_closure_analysis/capture-disjoint-field-struct.stderr
@@ -6,9 +6,10 @@ LL |     let c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/capture-disjoint-field-struct.rs:16:5
+  --> $DIR/capture-disjoint-field-struct.rs:17:5
    |
 LL | /     || {
 LL | |
@@ -20,13 +21,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing p[(0, 0)] -> ImmBorrow
-  --> $DIR/capture-disjoint-field-struct.rs:19:24
+  --> $DIR/capture-disjoint-field-struct.rs:20:24
    |
 LL |         println!("{}", p.x);
    |                        ^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/capture-disjoint-field-struct.rs:16:5
+  --> $DIR/capture-disjoint-field-struct.rs:17:5
    |
 LL | /     || {
 LL | |
@@ -38,7 +39,7 @@ LL | |     };
    | |_____^
    |
 note: Min Capture p[(0, 0)] -> ImmBorrow
-  --> $DIR/capture-disjoint-field-struct.rs:19:24
+  --> $DIR/capture-disjoint-field-struct.rs:20:24
    |
 LL |         println!("{}", p.x);
    |                        ^^^
diff --git a/tests/ui/closures/2229_closure_analysis/capture-disjoint-field-tuple.rs b/tests/ui/closures/2229_closure_analysis/capture-disjoint-field-tuple.rs
index 8d3bb3262fb2b..bf36de634a9b5 100644
--- a/tests/ui/closures/2229_closure_analysis/capture-disjoint-field-tuple.rs
+++ b/tests/ui/closures/2229_closure_analysis/capture-disjoint-field-tuple.rs
@@ -8,6 +8,7 @@ fn main() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ First Pass analysis includes:
     //~| Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/capture-disjoint-field-tuple.stderr b/tests/ui/closures/2229_closure_analysis/capture-disjoint-field-tuple.stderr
index a8ca9622a6a68..d5333bf71db37 100644
--- a/tests/ui/closures/2229_closure_analysis/capture-disjoint-field-tuple.stderr
+++ b/tests/ui/closures/2229_closure_analysis/capture-disjoint-field-tuple.stderr
@@ -6,9 +6,10 @@ LL |     let c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/capture-disjoint-field-tuple.rs:11:5
+  --> $DIR/capture-disjoint-field-tuple.rs:12:5
    |
 LL | /     || {
 LL | |
@@ -20,13 +21,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing t[(0, 0)] -> ImmBorrow
-  --> $DIR/capture-disjoint-field-tuple.rs:14:24
+  --> $DIR/capture-disjoint-field-tuple.rs:15:24
    |
 LL |         println!("{}", t.0);
    |                        ^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/capture-disjoint-field-tuple.rs:11:5
+  --> $DIR/capture-disjoint-field-tuple.rs:12:5
    |
 LL | /     || {
 LL | |
@@ -38,7 +39,7 @@ LL | |     };
    | |_____^
    |
 note: Min Capture t[(0, 0)] -> ImmBorrow
-  --> $DIR/capture-disjoint-field-tuple.rs:14:24
+  --> $DIR/capture-disjoint-field-tuple.rs:15:24
    |
 LL |         println!("{}", t.0);
    |                        ^^^
diff --git a/tests/ui/closures/2229_closure_analysis/capture-enums.rs b/tests/ui/closures/2229_closure_analysis/capture-enums.rs
index 322ae99b86138..47926e27f0c33 100644
--- a/tests/ui/closures/2229_closure_analysis/capture-enums.rs
+++ b/tests/ui/closures/2229_closure_analysis/capture-enums.rs
@@ -16,6 +16,7 @@ fn multi_variant_enum() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ First Pass analysis includes:
     //~| Min Capture analysis includes:
@@ -47,6 +48,7 @@ fn single_variant_enum() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ First Pass analysis includes:
     //~| Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/capture-enums.stderr b/tests/ui/closures/2229_closure_analysis/capture-enums.stderr
index 8a6ba8444a80a..8b258569d95dc 100644
--- a/tests/ui/closures/2229_closure_analysis/capture-enums.stderr
+++ b/tests/ui/closures/2229_closure_analysis/capture-enums.stderr
@@ -6,18 +6,20 @@ LL |     let c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/capture-enums.rs:47:13
+  --> $DIR/capture-enums.rs:48:13
    |
 LL |     let c = #[rustc_capture_analysis]
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/capture-enums.rs:19:5
+  --> $DIR/capture-enums.rs:20:5
    |
 LL | /     || {
 LL | |
@@ -29,28 +31,28 @@ LL | |     };
    | |_____^
    |
 note: Capturing point[] -> ImmBorrow
-  --> $DIR/capture-enums.rs:22:41
+  --> $DIR/capture-enums.rs:23:41
    |
 LL |         if let Info::Point(_, _, str) = point {
    |                                         ^^^^^
 note: Capturing point[(2, 0)] -> ByValue
-  --> $DIR/capture-enums.rs:22:41
+  --> $DIR/capture-enums.rs:23:41
    |
 LL |         if let Info::Point(_, _, str) = point {
    |                                         ^^^^^
 note: Capturing meta[] -> ImmBorrow
-  --> $DIR/capture-enums.rs:29:35
+  --> $DIR/capture-enums.rs:30:35
    |
 LL |         if let Info::Meta(_, v) = meta {
    |                                   ^^^^
 note: Capturing meta[(1, 1)] -> ByValue
-  --> $DIR/capture-enums.rs:29:35
+  --> $DIR/capture-enums.rs:30:35
    |
 LL |         if let Info::Meta(_, v) = meta {
    |                                   ^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/capture-enums.rs:19:5
+  --> $DIR/capture-enums.rs:20:5
    |
 LL | /     || {
 LL | |
@@ -62,18 +64,18 @@ LL | |     };
    | |_____^
    |
 note: Min Capture point[] -> ByValue
-  --> $DIR/capture-enums.rs:22:41
+  --> $DIR/capture-enums.rs:23:41
    |
 LL |         if let Info::Point(_, _, str) = point {
    |                                         ^^^^^
 note: Min Capture meta[] -> ByValue
-  --> $DIR/capture-enums.rs:29:35
+  --> $DIR/capture-enums.rs:30:35
    |
 LL |         if let Info::Meta(_, v) = meta {
    |                                   ^^^^
 
 error: First Pass analysis includes:
-  --> $DIR/capture-enums.rs:50:5
+  --> $DIR/capture-enums.rs:52:5
    |
 LL | /     || {
 LL | |
@@ -85,13 +87,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing point[(2, 0)] -> ByValue
-  --> $DIR/capture-enums.rs:53:47
+  --> $DIR/capture-enums.rs:55:47
    |
 LL |         let SingleVariant::Point(_, _, str) = point;
    |                                               ^^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/capture-enums.rs:50:5
+  --> $DIR/capture-enums.rs:52:5
    |
 LL | /     || {
 LL | |
@@ -103,7 +105,7 @@ LL | |     };
    | |_____^
    |
 note: Min Capture point[(2, 0)] -> ByValue
-  --> $DIR/capture-enums.rs:53:47
+  --> $DIR/capture-enums.rs:55:47
    |
 LL |         let SingleVariant::Point(_, _, str) = point;
    |                                               ^^^^^
diff --git a/tests/ui/closures/2229_closure_analysis/deep-multilevel-struct.rs b/tests/ui/closures/2229_closure_analysis/deep-multilevel-struct.rs
index 3341166e22b92..18697a79cffb2 100644
--- a/tests/ui/closures/2229_closure_analysis/deep-multilevel-struct.rs
+++ b/tests/ui/closures/2229_closure_analysis/deep-multilevel-struct.rs
@@ -34,6 +34,7 @@ fn main() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/deep-multilevel-struct.stderr b/tests/ui/closures/2229_closure_analysis/deep-multilevel-struct.stderr
index 29e1af0431ec6..55ba416dfd961 100644
--- a/tests/ui/closures/2229_closure_analysis/deep-multilevel-struct.stderr
+++ b/tests/ui/closures/2229_closure_analysis/deep-multilevel-struct.stderr
@@ -6,9 +6,10 @@ LL |     let c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/deep-multilevel-struct.rs:37:5
+  --> $DIR/deep-multilevel-struct.rs:38:5
    |
 LL | /     || {
 LL | |
@@ -20,23 +21,23 @@ LL | |     };
    | |_____^
    |
 note: Capturing p[(0, 0),(0, 0),(0, 0)] -> ImmBorrow
-  --> $DIR/deep-multilevel-struct.rs:40:18
+  --> $DIR/deep-multilevel-struct.rs:41:18
    |
 LL |         let x = &p.a.p.x;
    |                  ^^^^^^^
 note: Capturing p[(1, 0),(1, 0),(1, 0)] -> MutBorrow
-  --> $DIR/deep-multilevel-struct.rs:42:9
+  --> $DIR/deep-multilevel-struct.rs:43:9
    |
 LL |         p.b.q.y = 9;
    |         ^^^^^^^
 note: Capturing p[] -> ImmBorrow
-  --> $DIR/deep-multilevel-struct.rs:45:26
+  --> $DIR/deep-multilevel-struct.rs:46:26
    |
 LL |         println!("{:?}", p);
    |                          ^
 
 error: Min Capture analysis includes:
-  --> $DIR/deep-multilevel-struct.rs:37:5
+  --> $DIR/deep-multilevel-struct.rs:38:5
    |
 LL | /     || {
 LL | |
@@ -48,7 +49,7 @@ LL | |     };
    | |_____^
    |
 note: Min Capture p[] -> MutBorrow
-  --> $DIR/deep-multilevel-struct.rs:42:9
+  --> $DIR/deep-multilevel-struct.rs:43:9
    |
 LL |         p.b.q.y = 9;
    |         ^^^^^^^ p[] captured as MutBorrow here
diff --git a/tests/ui/closures/2229_closure_analysis/deep-multilevel-tuple.rs b/tests/ui/closures/2229_closure_analysis/deep-multilevel-tuple.rs
index 34b0132f3cb0b..2f899f8c60aa5 100644
--- a/tests/ui/closures/2229_closure_analysis/deep-multilevel-tuple.rs
+++ b/tests/ui/closures/2229_closure_analysis/deep-multilevel-tuple.rs
@@ -8,6 +8,7 @@ fn main() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/deep-multilevel-tuple.stderr b/tests/ui/closures/2229_closure_analysis/deep-multilevel-tuple.stderr
index e917516765c8f..5e45fe1ca8b6a 100644
--- a/tests/ui/closures/2229_closure_analysis/deep-multilevel-tuple.stderr
+++ b/tests/ui/closures/2229_closure_analysis/deep-multilevel-tuple.stderr
@@ -6,9 +6,10 @@ LL |     let c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/deep-multilevel-tuple.rs:11:5
+  --> $DIR/deep-multilevel-tuple.rs:12:5
    |
 LL | /     || {
 LL | |
@@ -20,23 +21,23 @@ LL | |     };
    | |_____^
    |
 note: Capturing t[(0, 0),(0, 0),(0, 0)] -> ImmBorrow
-  --> $DIR/deep-multilevel-tuple.rs:14:18
+  --> $DIR/deep-multilevel-tuple.rs:15:18
    |
 LL |         let x = &t.0.0.0;
    |                  ^^^^^^^
 note: Capturing t[(1, 0),(1, 0),(1, 0)] -> MutBorrow
-  --> $DIR/deep-multilevel-tuple.rs:16:9
+  --> $DIR/deep-multilevel-tuple.rs:17:9
    |
 LL |         t.1.1.1 = 9;
    |         ^^^^^^^
 note: Capturing t[] -> ImmBorrow
-  --> $DIR/deep-multilevel-tuple.rs:19:26
+  --> $DIR/deep-multilevel-tuple.rs:20:26
    |
 LL |         println!("{:?}", t);
    |                          ^
 
 error: Min Capture analysis includes:
-  --> $DIR/deep-multilevel-tuple.rs:11:5
+  --> $DIR/deep-multilevel-tuple.rs:12:5
    |
 LL | /     || {
 LL | |
@@ -48,7 +49,7 @@ LL | |     };
    | |_____^
    |
 note: Min Capture t[] -> MutBorrow
-  --> $DIR/deep-multilevel-tuple.rs:16:9
+  --> $DIR/deep-multilevel-tuple.rs:17:9
    |
 LL |         t.1.1.1 = 9;
    |         ^^^^^^^ t[] captured as MutBorrow here
diff --git a/tests/ui/closures/2229_closure_analysis/destructure_patterns.rs b/tests/ui/closures/2229_closure_analysis/destructure_patterns.rs
index 6c65a7bf87b96..a0b949e1351b5 100644
--- a/tests/ui/closures/2229_closure_analysis/destructure_patterns.rs
+++ b/tests/ui/closures/2229_closure_analysis/destructure_patterns.rs
@@ -10,6 +10,7 @@ fn arrays() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
@@ -38,6 +39,7 @@ fn structs() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
@@ -58,6 +60,7 @@ fn tuples() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/destructure_patterns.stderr b/tests/ui/closures/2229_closure_analysis/destructure_patterns.stderr
index 44fbe6d8158f2..7fc85de499f87 100644
--- a/tests/ui/closures/2229_closure_analysis/destructure_patterns.stderr
+++ b/tests/ui/closures/2229_closure_analysis/destructure_patterns.stderr
@@ -6,27 +6,30 @@ LL |     let c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/destructure_patterns.rs:38:13
+  --> $DIR/destructure_patterns.rs:39:13
    |
 LL |     let c = #[rustc_capture_analysis]
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/destructure_patterns.rs:58:13
+  --> $DIR/destructure_patterns.rs:60:13
    |
 LL |     let c = #[rustc_capture_analysis]
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/destructure_patterns.rs:13:5
+  --> $DIR/destructure_patterns.rs:14:5
    |
 LL | /     || {
 LL | |
@@ -38,23 +41,23 @@ LL | |     };
    | |_____^
    |
 note: Capturing arr[Index] -> ByValue
-  --> $DIR/destructure_patterns.rs:16:29
+  --> $DIR/destructure_patterns.rs:17:29
    |
 LL |         let [a, b, .., e] = arr;
    |                             ^^^
 note: Capturing arr[Index] -> ByValue
-  --> $DIR/destructure_patterns.rs:16:29
+  --> $DIR/destructure_patterns.rs:17:29
    |
 LL |         let [a, b, .., e] = arr;
    |                             ^^^
 note: Capturing arr[Index] -> ByValue
-  --> $DIR/destructure_patterns.rs:16:29
+  --> $DIR/destructure_patterns.rs:17:29
    |
 LL |         let [a, b, .., e] = arr;
    |                             ^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/destructure_patterns.rs:13:5
+  --> $DIR/destructure_patterns.rs:14:5
    |
 LL | /     || {
 LL | |
@@ -66,13 +69,13 @@ LL | |     };
    | |_____^
    |
 note: Min Capture arr[] -> ByValue
-  --> $DIR/destructure_patterns.rs:16:29
+  --> $DIR/destructure_patterns.rs:17:29
    |
 LL |         let [a, b, .., e] = arr;
    |                             ^^^
 
 error: First Pass analysis includes:
-  --> $DIR/destructure_patterns.rs:41:5
+  --> $DIR/destructure_patterns.rs:43:5
    |
 LL | /     || {
 LL | |
@@ -84,18 +87,18 @@ LL | |     };
    | |_____^
    |
 note: Capturing p[(0, 0)] -> MutBorrow
-  --> $DIR/destructure_patterns.rs:44:58
+  --> $DIR/destructure_patterns.rs:46:58
    |
 LL |         let Point { x: ref mut x, y: _, id: moved_id } = p;
    |                                                          ^
 note: Capturing p[(2, 0)] -> ByValue
-  --> $DIR/destructure_patterns.rs:44:58
+  --> $DIR/destructure_patterns.rs:46:58
    |
 LL |         let Point { x: ref mut x, y: _, id: moved_id } = p;
    |                                                          ^
 
 error: Min Capture analysis includes:
-  --> $DIR/destructure_patterns.rs:41:5
+  --> $DIR/destructure_patterns.rs:43:5
    |
 LL | /     || {
 LL | |
@@ -107,18 +110,18 @@ LL | |     };
    | |_____^
    |
 note: Min Capture p[(0, 0)] -> MutBorrow
-  --> $DIR/destructure_patterns.rs:44:58
+  --> $DIR/destructure_patterns.rs:46:58
    |
 LL |         let Point { x: ref mut x, y: _, id: moved_id } = p;
    |                                                          ^
 note: Min Capture p[(2, 0)] -> ByValue
-  --> $DIR/destructure_patterns.rs:44:58
+  --> $DIR/destructure_patterns.rs:46:58
    |
 LL |         let Point { x: ref mut x, y: _, id: moved_id } = p;
    |                                                          ^
 
 error: First Pass analysis includes:
-  --> $DIR/destructure_patterns.rs:61:5
+  --> $DIR/destructure_patterns.rs:64:5
    |
 LL | /     || {
 LL | |
@@ -130,23 +133,23 @@ LL | |     };
    | |_____^
    |
 note: Capturing t[(0, 0)] -> MutBorrow
-  --> $DIR/destructure_patterns.rs:64:54
+  --> $DIR/destructure_patterns.rs:67:54
    |
 LL |         let (ref mut x, ref ref_str, (moved_s, _)) = t;
    |                                                      ^
 note: Capturing t[(1, 0)] -> ImmBorrow
-  --> $DIR/destructure_patterns.rs:64:54
+  --> $DIR/destructure_patterns.rs:67:54
    |
 LL |         let (ref mut x, ref ref_str, (moved_s, _)) = t;
    |                                                      ^
 note: Capturing t[(2, 0),(0, 0)] -> ByValue
-  --> $DIR/destructure_patterns.rs:64:54
+  --> $DIR/destructure_patterns.rs:67:54
    |
 LL |         let (ref mut x, ref ref_str, (moved_s, _)) = t;
    |                                                      ^
 
 error: Min Capture analysis includes:
-  --> $DIR/destructure_patterns.rs:61:5
+  --> $DIR/destructure_patterns.rs:64:5
    |
 LL | /     || {
 LL | |
@@ -158,17 +161,17 @@ LL | |     };
    | |_____^
    |
 note: Min Capture t[(0, 0)] -> MutBorrow
-  --> $DIR/destructure_patterns.rs:64:54
+  --> $DIR/destructure_patterns.rs:67:54
    |
 LL |         let (ref mut x, ref ref_str, (moved_s, _)) = t;
    |                                                      ^
 note: Min Capture t[(1, 0)] -> ImmBorrow
-  --> $DIR/destructure_patterns.rs:64:54
+  --> $DIR/destructure_patterns.rs:67:54
    |
 LL |         let (ref mut x, ref ref_str, (moved_s, _)) = t;
    |                                                      ^
 note: Min Capture t[(2, 0),(0, 0)] -> ByValue
-  --> $DIR/destructure_patterns.rs:64:54
+  --> $DIR/destructure_patterns.rs:67:54
    |
 LL |         let (ref mut x, ref ref_str, (moved_s, _)) = t;
    |                                                      ^
diff --git a/tests/ui/closures/2229_closure_analysis/feature-gate-capture_disjoint_fields.rs b/tests/ui/closures/2229_closure_analysis/feature-gate-capture_disjoint_fields.rs
index 269cf76e67351..26990b4305f85 100644
--- a/tests/ui/closures/2229_closure_analysis/feature-gate-capture_disjoint_fields.rs
+++ b/tests/ui/closures/2229_closure_analysis/feature-gate-capture_disjoint_fields.rs
@@ -8,6 +8,7 @@ fn main() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/feature-gate-capture_disjoint_fields.stderr b/tests/ui/closures/2229_closure_analysis/feature-gate-capture_disjoint_fields.stderr
index b936c5ee35a4d..4e76070dcf7cb 100644
--- a/tests/ui/closures/2229_closure_analysis/feature-gate-capture_disjoint_fields.stderr
+++ b/tests/ui/closures/2229_closure_analysis/feature-gate-capture_disjoint_fields.stderr
@@ -6,9 +6,10 @@ LL |     let c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/feature-gate-capture_disjoint_fields.rs:11:5
+  --> $DIR/feature-gate-capture_disjoint_fields.rs:12:5
    |
 LL | /     || {
 LL | |
@@ -20,13 +21,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing s[] -> ImmBorrow
-  --> $DIR/feature-gate-capture_disjoint_fields.rs:14:69
+  --> $DIR/feature-gate-capture_disjoint_fields.rs:15:69
    |
 LL |         println!("This uses new capture analyysis to capture s={}", s);
    |                                                                     ^
 
 error: Min Capture analysis includes:
-  --> $DIR/feature-gate-capture_disjoint_fields.rs:11:5
+  --> $DIR/feature-gate-capture_disjoint_fields.rs:12:5
    |
 LL | /     || {
 LL | |
@@ -38,7 +39,7 @@ LL | |     };
    | |_____^
    |
 note: Min Capture s[] -> ImmBorrow
-  --> $DIR/feature-gate-capture_disjoint_fields.rs:14:69
+  --> $DIR/feature-gate-capture_disjoint_fields.rs:15:69
    |
 LL |         println!("This uses new capture analyysis to capture s={}", s);
    |                                                                     ^
diff --git a/tests/ui/closures/2229_closure_analysis/issue-87378.rs b/tests/ui/closures/2229_closure_analysis/issue-87378.rs
index 75901a5718bae..f0707b51bbb66 100644
--- a/tests/ui/closures/2229_closure_analysis/issue-87378.rs
+++ b/tests/ui/closures/2229_closure_analysis/issue-87378.rs
@@ -14,6 +14,7 @@ fn main() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/issue-87378.stderr b/tests/ui/closures/2229_closure_analysis/issue-87378.stderr
index 16c3f7c976dd7..19c0c59170b39 100644
--- a/tests/ui/closures/2229_closure_analysis/issue-87378.stderr
+++ b/tests/ui/closures/2229_closure_analysis/issue-87378.stderr
@@ -6,9 +6,10 @@ LL |     let c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/issue-87378.rs:17:5
+  --> $DIR/issue-87378.rs:18:5
    |
 LL | /     || {
 LL | |
@@ -20,13 +21,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing u[(0, 0)] -> ImmBorrow
-  --> $DIR/issue-87378.rs:20:17
+  --> $DIR/issue-87378.rs:21:17
    |
 LL |        unsafe { u.value }
    |                 ^^^^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/issue-87378.rs:17:5
+  --> $DIR/issue-87378.rs:18:5
    |
 LL | /     || {
 LL | |
@@ -38,7 +39,7 @@ LL | |     };
    | |_____^
    |
 note: Min Capture u[] -> ImmBorrow
-  --> $DIR/issue-87378.rs:20:17
+  --> $DIR/issue-87378.rs:21:17
    |
 LL |        unsafe { u.value }
    |                 ^^^^^^^
diff --git a/tests/ui/closures/2229_closure_analysis/issue-88476.rs b/tests/ui/closures/2229_closure_analysis/issue-88476.rs
index f5906d306007e..58d86283f908b 100644
--- a/tests/ui/closures/2229_closure_analysis/issue-88476.rs
+++ b/tests/ui/closures/2229_closure_analysis/issue-88476.rs
@@ -20,6 +20,7 @@ pub fn test1() {
     let x = #[rustc_capture_analysis] move || {
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     //~| ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
         println!("{:?}", f.0);
@@ -47,6 +48,7 @@ fn test2() {
     let c = #[rustc_capture_analysis] move || {
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     //~| ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
         println!("{}", character.hp)
diff --git a/tests/ui/closures/2229_closure_analysis/issue-88476.stderr b/tests/ui/closures/2229_closure_analysis/issue-88476.stderr
index c7c9ecbbb0e8e..d020175715729 100644
--- a/tests/ui/closures/2229_closure_analysis/issue-88476.stderr
+++ b/tests/ui/closures/2229_closure_analysis/issue-88476.stderr
@@ -6,15 +6,17 @@ LL |     let x = #[rustc_capture_analysis] move || {
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/issue-88476.rs:47:13
+  --> $DIR/issue-88476.rs:48:13
    |
 LL |     let c = #[rustc_capture_analysis] move || {
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
   --> $DIR/issue-88476.rs:20:39
@@ -30,7 +32,7 @@ LL | |     };
    | |_____^
    |
 note: Capturing f[(0, 0)] -> ImmBorrow
-  --> $DIR/issue-88476.rs:25:26
+  --> $DIR/issue-88476.rs:26:26
    |
 LL |         println!("{:?}", f.0);
    |                          ^^^
@@ -49,13 +51,13 @@ LL | |     };
    | |_____^
    |
 note: Min Capture f[] -> ByValue
-  --> $DIR/issue-88476.rs:25:26
+  --> $DIR/issue-88476.rs:26:26
    |
 LL |         println!("{:?}", f.0);
    |                          ^^^
 
 error: First Pass analysis includes:
-  --> $DIR/issue-88476.rs:47:39
+  --> $DIR/issue-88476.rs:48:39
    |
 LL |       let c = #[rustc_capture_analysis] move || {
    |  _______________________________________^
@@ -68,13 +70,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing character[(0, 0)] -> ImmBorrow
-  --> $DIR/issue-88476.rs:52:24
+  --> $DIR/issue-88476.rs:54:24
    |
 LL |         println!("{}", character.hp)
    |                        ^^^^^^^^^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/issue-88476.rs:47:39
+  --> $DIR/issue-88476.rs:48:39
    |
 LL |       let c = #[rustc_capture_analysis] move || {
    |  _______________________________________^
@@ -87,7 +89,7 @@ LL | |     };
    | |_____^
    |
 note: Min Capture character[(0, 0)] -> ByValue
-  --> $DIR/issue-88476.rs:52:24
+  --> $DIR/issue-88476.rs:54:24
    |
 LL |         println!("{}", character.hp)
    |                        ^^^^^^^^^^^^
diff --git a/tests/ui/closures/2229_closure_analysis/move_closure.rs b/tests/ui/closures/2229_closure_analysis/move_closure.rs
index b542fa2430c34..31e04fa6d5c5e 100644
--- a/tests/ui/closures/2229_closure_analysis/move_closure.rs
+++ b/tests/ui/closures/2229_closure_analysis/move_closure.rs
@@ -12,6 +12,7 @@ fn simple_move_closure() {
     let mut c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     move || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
@@ -30,6 +31,7 @@ fn simple_ref() {
     let mut c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     move || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
@@ -51,6 +53,7 @@ fn struct_contains_ref_to_another_struct_1() {
     let mut c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     move || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
@@ -74,6 +77,7 @@ fn struct_contains_ref_to_another_struct_2() {
     let mut c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     move || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
@@ -96,6 +100,7 @@ fn struct_contains_ref_to_another_struct_3() {
     let mut c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     move || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
@@ -117,6 +122,7 @@ fn truncate_box_derefs() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     move || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
@@ -133,6 +139,7 @@ fn truncate_box_derefs() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     move || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
@@ -150,6 +157,7 @@ fn truncate_box_derefs() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     move || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
@@ -172,6 +180,7 @@ fn box_mut_1() {
     let c = #[rustc_capture_analysis] move || box_p_foo.x += 10;
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     //~| First Pass analysis includes:
     //~| NOTE: Capturing box_p_foo[Deref,Deref,(0, 0)] -> MutBorrow
     //~| Min Capture analysis includes:
@@ -189,6 +198,7 @@ fn box_mut_2() {
     let c = #[rustc_capture_analysis] move || p_foo.x += 10;
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     //~| First Pass analysis includes:
     //~| NOTE: Capturing p_foo[Deref,Deref,(0, 0)] -> MutBorrow
     //~| Min Capture analysis includes:
@@ -202,6 +212,7 @@ fn returned_closure_owns_copy_type_data() -> impl Fn() -> i32 {
     let c = #[rustc_capture_analysis] move || x;
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     //~| First Pass analysis includes:
     //~| NOTE: Capturing x[] -> ImmBorrow
     //~| Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/move_closure.stderr b/tests/ui/closures/2229_closure_analysis/move_closure.stderr
index fd80e05c6893f..7e9e3c5fed382 100644
--- a/tests/ui/closures/2229_closure_analysis/move_closure.stderr
+++ b/tests/ui/closures/2229_closure_analysis/move_closure.stderr
@@ -6,123 +6,134 @@ LL |     let mut c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/move_closure.rs:30:17
+  --> $DIR/move_closure.rs:31:17
    |
 LL |     let mut c = #[rustc_capture_analysis]
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/move_closure.rs:51:17
+  --> $DIR/move_closure.rs:53:17
    |
 LL |     let mut c = #[rustc_capture_analysis]
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/move_closure.rs:74:17
+  --> $DIR/move_closure.rs:77:17
    |
 LL |     let mut c = #[rustc_capture_analysis]
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/move_closure.rs:96:17
+  --> $DIR/move_closure.rs:100:17
    |
 LL |     let mut c = #[rustc_capture_analysis]
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/move_closure.rs:117:13
+  --> $DIR/move_closure.rs:122:13
    |
 LL |     let c = #[rustc_capture_analysis]
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/move_closure.rs:133:13
+  --> $DIR/move_closure.rs:139:13
    |
 LL |     let c = #[rustc_capture_analysis]
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/move_closure.rs:150:13
+  --> $DIR/move_closure.rs:157:13
    |
 LL |     let c = #[rustc_capture_analysis]
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/move_closure.rs:172:13
+  --> $DIR/move_closure.rs:180:13
    |
 LL |     let c = #[rustc_capture_analysis] move || box_p_foo.x += 10;
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/move_closure.rs:189:13
+  --> $DIR/move_closure.rs:198:13
    |
 LL |     let c = #[rustc_capture_analysis] move || p_foo.x += 10;
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/move_closure.rs:202:13
+  --> $DIR/move_closure.rs:212:13
    |
 LL |     let c = #[rustc_capture_analysis] move || x;
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/move_closure.rs:202:39
+  --> $DIR/move_closure.rs:212:39
    |
 LL |     let c = #[rustc_capture_analysis] move || x;
    |                                       ^^^^^^^^^
    |
 note: Capturing x[] -> ImmBorrow
-  --> $DIR/move_closure.rs:202:47
+  --> $DIR/move_closure.rs:212:47
    |
 LL |     let c = #[rustc_capture_analysis] move || x;
    |                                               ^
 
 error: Min Capture analysis includes:
-  --> $DIR/move_closure.rs:202:39
+  --> $DIR/move_closure.rs:212:39
    |
 LL |     let c = #[rustc_capture_analysis] move || x;
    |                                       ^^^^^^^^^
    |
 note: Min Capture x[] -> ByValue
-  --> $DIR/move_closure.rs:202:47
+  --> $DIR/move_closure.rs:212:47
    |
 LL |     let c = #[rustc_capture_analysis] move || x;
    |                                               ^
 
 error: First Pass analysis includes:
-  --> $DIR/move_closure.rs:15:5
+  --> $DIR/move_closure.rs:16:5
    |
 LL | /     move || {
 LL | |
@@ -134,13 +145,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing t[(0, 0),(0, 0)] -> MutBorrow
-  --> $DIR/move_closure.rs:18:9
+  --> $DIR/move_closure.rs:19:9
    |
 LL |         t.0.0 = "new S".into();
    |         ^^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/move_closure.rs:15:5
+  --> $DIR/move_closure.rs:16:5
    |
 LL | /     move || {
 LL | |
@@ -152,13 +163,13 @@ LL | |     };
    | |_____^
    |
 note: Min Capture t[(0, 0),(0, 0)] -> ByValue
-  --> $DIR/move_closure.rs:18:9
+  --> $DIR/move_closure.rs:19:9
    |
 LL |         t.0.0 = "new S".into();
    |         ^^^^^
 
 error: First Pass analysis includes:
-  --> $DIR/move_closure.rs:33:5
+  --> $DIR/move_closure.rs:35:5
    |
 LL | /     move || {
 LL | |
@@ -170,13 +181,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing ref_s[Deref] -> MutBorrow
-  --> $DIR/move_closure.rs:36:9
+  --> $DIR/move_closure.rs:38:9
    |
 LL |         *ref_s += 10;
    |         ^^^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/move_closure.rs:33:5
+  --> $DIR/move_closure.rs:35:5
    |
 LL | /     move || {
 LL | |
@@ -188,13 +199,13 @@ LL | |     };
    | |_____^
    |
 note: Min Capture ref_s[] -> ByValue
-  --> $DIR/move_closure.rs:36:9
+  --> $DIR/move_closure.rs:38:9
    |
 LL |         *ref_s += 10;
    |         ^^^^^^
 
 error: First Pass analysis includes:
-  --> $DIR/move_closure.rs:54:5
+  --> $DIR/move_closure.rs:57:5
    |
 LL | /     move || {
 LL | |
@@ -206,13 +217,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing t[(0, 0),Deref,(0, 0)] -> MutBorrow
-  --> $DIR/move_closure.rs:57:9
+  --> $DIR/move_closure.rs:60:9
    |
 LL |         t.0.0 = "new s".into();
    |         ^^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/move_closure.rs:54:5
+  --> $DIR/move_closure.rs:57:5
    |
 LL | /     move || {
 LL | |
@@ -224,13 +235,13 @@ LL | |     };
    | |_____^
    |
 note: Min Capture t[(0, 0)] -> ByValue
-  --> $DIR/move_closure.rs:57:9
+  --> $DIR/move_closure.rs:60:9
    |
 LL |         t.0.0 = "new s".into();
    |         ^^^^^
 
 error: First Pass analysis includes:
-  --> $DIR/move_closure.rs:77:5
+  --> $DIR/move_closure.rs:81:5
    |
 LL | /     move || {
 LL | |
@@ -242,13 +253,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing t[(0, 0),Deref,(0, 0)] -> ImmBorrow
-  --> $DIR/move_closure.rs:80:18
+  --> $DIR/move_closure.rs:84:18
    |
 LL |         let _t = t.0.0;
    |                  ^^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/move_closure.rs:77:5
+  --> $DIR/move_closure.rs:81:5
    |
 LL | /     move || {
 LL | |
@@ -260,13 +271,13 @@ LL | |     };
    | |_____^
    |
 note: Min Capture t[(0, 0)] -> ByValue
-  --> $DIR/move_closure.rs:80:18
+  --> $DIR/move_closure.rs:84:18
    |
 LL |         let _t = t.0.0;
    |                  ^^^^^
 
 error: First Pass analysis includes:
-  --> $DIR/move_closure.rs:99:5
+  --> $DIR/move_closure.rs:104:5
    |
 LL | /     move || {
 LL | |
@@ -278,13 +289,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing t[(0, 0),Deref,(0, 0)] -> ByValue
-  --> $DIR/move_closure.rs:102:18
+  --> $DIR/move_closure.rs:107:18
    |
 LL |         let _t = t.0.0;
    |                  ^^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/move_closure.rs:99:5
+  --> $DIR/move_closure.rs:104:5
    |
 LL | /     move || {
 LL | |
@@ -296,13 +307,13 @@ LL | |     };
    | |_____^
    |
 note: Min Capture t[(0, 0)] -> ByValue
-  --> $DIR/move_closure.rs:102:18
+  --> $DIR/move_closure.rs:107:18
    |
 LL |         let _t = t.0.0;
    |                  ^^^^^
 
 error: First Pass analysis includes:
-  --> $DIR/move_closure.rs:120:5
+  --> $DIR/move_closure.rs:126:5
    |
 LL | /     move || {
 LL | |
@@ -314,13 +325,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing b[Deref,(0, 0)] -> ImmBorrow
-  --> $DIR/move_closure.rs:123:18
+  --> $DIR/move_closure.rs:129:18
    |
 LL |         let _t = b.0;
    |                  ^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/move_closure.rs:120:5
+  --> $DIR/move_closure.rs:126:5
    |
 LL | /     move || {
 LL | |
@@ -332,13 +343,13 @@ LL | |     };
    | |_____^
    |
 note: Min Capture b[] -> ByValue
-  --> $DIR/move_closure.rs:123:18
+  --> $DIR/move_closure.rs:129:18
    |
 LL |         let _t = b.0;
    |                  ^^^
 
 error: First Pass analysis includes:
-  --> $DIR/move_closure.rs:136:5
+  --> $DIR/move_closure.rs:143:5
    |
 LL | /     move || {
 LL | |
@@ -350,13 +361,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing b[Deref,(0, 0)] -> ImmBorrow
-  --> $DIR/move_closure.rs:139:24
+  --> $DIR/move_closure.rs:146:24
    |
 LL |         println!("{}", b.0);
    |                        ^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/move_closure.rs:136:5
+  --> $DIR/move_closure.rs:143:5
    |
 LL | /     move || {
 LL | |
@@ -368,13 +379,13 @@ LL | |     };
    | |_____^
    |
 note: Min Capture b[] -> ByValue
-  --> $DIR/move_closure.rs:139:24
+  --> $DIR/move_closure.rs:146:24
    |
 LL |         println!("{}", b.0);
    |                        ^^^
 
 error: First Pass analysis includes:
-  --> $DIR/move_closure.rs:153:5
+  --> $DIR/move_closure.rs:161:5
    |
 LL | /     move || {
 LL | |
@@ -386,13 +397,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing t[(1, 0),Deref,(0, 0)] -> ImmBorrow
-  --> $DIR/move_closure.rs:156:24
+  --> $DIR/move_closure.rs:164:24
    |
 LL |         println!("{}", t.1.0);
    |                        ^^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/move_closure.rs:153:5
+  --> $DIR/move_closure.rs:161:5
    |
 LL | /     move || {
 LL | |
@@ -404,55 +415,55 @@ LL | |     };
    | |_____^
    |
 note: Min Capture t[(1, 0)] -> ByValue
-  --> $DIR/move_closure.rs:156:24
+  --> $DIR/move_closure.rs:164:24
    |
 LL |         println!("{}", t.1.0);
    |                        ^^^^^
 
 error: First Pass analysis includes:
-  --> $DIR/move_closure.rs:172:39
+  --> $DIR/move_closure.rs:180:39
    |
 LL |     let c = #[rustc_capture_analysis] move || box_p_foo.x += 10;
    |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
 note: Capturing box_p_foo[Deref,Deref,(0, 0)] -> MutBorrow
-  --> $DIR/move_closure.rs:172:47
+  --> $DIR/move_closure.rs:180:47
    |
 LL |     let c = #[rustc_capture_analysis] move || box_p_foo.x += 10;
    |                                               ^^^^^^^^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/move_closure.rs:172:39
+  --> $DIR/move_closure.rs:180:39
    |
 LL |     let c = #[rustc_capture_analysis] move || box_p_foo.x += 10;
    |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
 note: Min Capture box_p_foo[] -> ByValue
-  --> $DIR/move_closure.rs:172:47
+  --> $DIR/move_closure.rs:180:47
    |
 LL |     let c = #[rustc_capture_analysis] move || box_p_foo.x += 10;
    |                                               ^^^^^^^^^^^
 
 error: First Pass analysis includes:
-  --> $DIR/move_closure.rs:189:39
+  --> $DIR/move_closure.rs:198:39
    |
 LL |     let c = #[rustc_capture_analysis] move || p_foo.x += 10;
    |                                       ^^^^^^^^^^^^^^^^^^^^^
    |
 note: Capturing p_foo[Deref,Deref,(0, 0)] -> MutBorrow
-  --> $DIR/move_closure.rs:189:47
+  --> $DIR/move_closure.rs:198:47
    |
 LL |     let c = #[rustc_capture_analysis] move || p_foo.x += 10;
    |                                               ^^^^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/move_closure.rs:189:39
+  --> $DIR/move_closure.rs:198:39
    |
 LL |     let c = #[rustc_capture_analysis] move || p_foo.x += 10;
    |                                       ^^^^^^^^^^^^^^^^^^^^^
    |
 note: Min Capture p_foo[] -> ByValue
-  --> $DIR/move_closure.rs:189:47
+  --> $DIR/move_closure.rs:198:47
    |
 LL |     let c = #[rustc_capture_analysis] move || p_foo.x += 10;
    |                                               ^^^^^^^
diff --git a/tests/ui/closures/2229_closure_analysis/multilevel-path-1.rs b/tests/ui/closures/2229_closure_analysis/multilevel-path-1.rs
index a8a2acfa78d2c..8a6ecfbb9be88 100644
--- a/tests/ui/closures/2229_closure_analysis/multilevel-path-1.rs
+++ b/tests/ui/closures/2229_closure_analysis/multilevel-path-1.rs
@@ -22,6 +22,7 @@ fn main() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/multilevel-path-1.stderr b/tests/ui/closures/2229_closure_analysis/multilevel-path-1.stderr
index 29ad1c59198cf..118a7dacec6a2 100644
--- a/tests/ui/closures/2229_closure_analysis/multilevel-path-1.stderr
+++ b/tests/ui/closures/2229_closure_analysis/multilevel-path-1.stderr
@@ -6,9 +6,10 @@ LL |     let c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/multilevel-path-1.rs:25:5
+  --> $DIR/multilevel-path-1.rs:26:5
    |
 LL | /     || {
 LL | |
@@ -20,13 +21,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing w[(0, 0)] -> ImmBorrow
-  --> $DIR/multilevel-path-1.rs:28:19
+  --> $DIR/multilevel-path-1.rs:29:19
    |
 LL |         let wp = &w.p;
    |                   ^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/multilevel-path-1.rs:25:5
+  --> $DIR/multilevel-path-1.rs:26:5
    |
 LL | /     || {
 LL | |
@@ -38,7 +39,7 @@ LL | |     };
    | |_____^
    |
 note: Min Capture w[(0, 0)] -> ImmBorrow
-  --> $DIR/multilevel-path-1.rs:28:19
+  --> $DIR/multilevel-path-1.rs:29:19
    |
 LL |         let wp = &w.p;
    |                   ^^^
diff --git a/tests/ui/closures/2229_closure_analysis/multilevel-path-2.rs b/tests/ui/closures/2229_closure_analysis/multilevel-path-2.rs
index e21fe318cd105..fff80f9c855fa 100644
--- a/tests/ui/closures/2229_closure_analysis/multilevel-path-2.rs
+++ b/tests/ui/closures/2229_closure_analysis/multilevel-path-2.rs
@@ -17,6 +17,7 @@ fn main() {
     let c = #[rustc_capture_analysis]
         //~^ ERROR: attributes on expressions are experimental
         //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+        //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/multilevel-path-2.stderr b/tests/ui/closures/2229_closure_analysis/multilevel-path-2.stderr
index 929cba113146b..a7112531d9a26 100644
--- a/tests/ui/closures/2229_closure_analysis/multilevel-path-2.stderr
+++ b/tests/ui/closures/2229_closure_analysis/multilevel-path-2.stderr
@@ -6,9 +6,10 @@ LL |     let c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/multilevel-path-2.rs:20:5
+  --> $DIR/multilevel-path-2.rs:21:5
    |
 LL | /     || {
 LL | |
@@ -20,13 +21,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing w[(0, 0),(0, 0)] -> ImmBorrow
-  --> $DIR/multilevel-path-2.rs:23:24
+  --> $DIR/multilevel-path-2.rs:24:24
    |
 LL |         println!("{}", w.p.x);
    |                        ^^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/multilevel-path-2.rs:20:5
+  --> $DIR/multilevel-path-2.rs:21:5
    |
 LL | /     || {
 LL | |
@@ -38,7 +39,7 @@ LL | |     };
    | |_____^
    |
 note: Min Capture w[(0, 0),(0, 0)] -> ImmBorrow
-  --> $DIR/multilevel-path-2.rs:23:24
+  --> $DIR/multilevel-path-2.rs:24:24
    |
 LL |         println!("{}", w.p.x);
    |                        ^^^^^
diff --git a/tests/ui/closures/2229_closure_analysis/nested-closure.rs b/tests/ui/closures/2229_closure_analysis/nested-closure.rs
index 22eae744b8080..a7e3ef3b39c98 100644
--- a/tests/ui/closures/2229_closure_analysis/nested-closure.rs
+++ b/tests/ui/closures/2229_closure_analysis/nested-closure.rs
@@ -19,6 +19,7 @@ fn main() {
     let mut c1 = #[rustc_capture_analysis]
         //~^ ERROR: attributes on expressions are experimental
         //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+        //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
@@ -29,6 +30,7 @@ fn main() {
         let mut c2 = #[rustc_capture_analysis]
         //~^ ERROR: attributes on expressions are experimental
         //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+        //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
         || p.y += incr;
         //~^ ERROR: First Pass analysis includes:
         //~| ERROR: Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/nested-closure.stderr b/tests/ui/closures/2229_closure_analysis/nested-closure.stderr
index a50d0c6a182bc..256bfd58597b9 100644
--- a/tests/ui/closures/2229_closure_analysis/nested-closure.stderr
+++ b/tests/ui/closures/2229_closure_analysis/nested-closure.stderr
@@ -6,52 +6,54 @@ LL |     let mut c1 = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/nested-closure.rs:29:22
+  --> $DIR/nested-closure.rs:30:22
    |
 LL |         let mut c2 = #[rustc_capture_analysis]
    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/nested-closure.rs:32:9
+  --> $DIR/nested-closure.rs:34:9
    |
 LL |         || p.y += incr;
    |         ^^^^^^^^^^^^^^
    |
 note: Capturing p[(1, 0)] -> MutBorrow
-  --> $DIR/nested-closure.rs:32:12
+  --> $DIR/nested-closure.rs:34:12
    |
 LL |         || p.y += incr;
    |            ^^^
 note: Capturing incr[] -> ImmBorrow
-  --> $DIR/nested-closure.rs:32:19
+  --> $DIR/nested-closure.rs:34:19
    |
 LL |         || p.y += incr;
    |                   ^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/nested-closure.rs:32:9
+  --> $DIR/nested-closure.rs:34:9
    |
 LL |         || p.y += incr;
    |         ^^^^^^^^^^^^^^
    |
 note: Min Capture p[(1, 0)] -> MutBorrow
-  --> $DIR/nested-closure.rs:32:12
+  --> $DIR/nested-closure.rs:34:12
    |
 LL |         || p.y += incr;
    |            ^^^
 note: Min Capture incr[] -> ImmBorrow
-  --> $DIR/nested-closure.rs:32:19
+  --> $DIR/nested-closure.rs:34:19
    |
 LL |         || p.y += incr;
    |                   ^^^^
 
 error: First Pass analysis includes:
-  --> $DIR/nested-closure.rs:22:5
+  --> $DIR/nested-closure.rs:23:5
    |
 LL | /     || {
 LL | |
@@ -63,23 +65,23 @@ LL | |     };
    | |_____^
    |
 note: Capturing p[(0, 0)] -> ImmBorrow
-  --> $DIR/nested-closure.rs:25:24
+  --> $DIR/nested-closure.rs:26:24
    |
 LL |         println!("{}", p.x);
    |                        ^^^
 note: Capturing p[(1, 0)] -> MutBorrow
-  --> $DIR/nested-closure.rs:32:12
+  --> $DIR/nested-closure.rs:34:12
    |
 LL |         || p.y += incr;
    |            ^^^
 note: Capturing p[(1, 0)] -> ImmBorrow
-  --> $DIR/nested-closure.rs:42:24
+  --> $DIR/nested-closure.rs:44:24
    |
 LL |         println!("{}", p.y);
    |                        ^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/nested-closure.rs:22:5
+  --> $DIR/nested-closure.rs:23:5
    |
 LL | /     || {
 LL | |
@@ -91,12 +93,12 @@ LL | |     };
    | |_____^
    |
 note: Min Capture p[(0, 0)] -> ImmBorrow
-  --> $DIR/nested-closure.rs:25:24
+  --> $DIR/nested-closure.rs:26:24
    |
 LL |         println!("{}", p.x);
    |                        ^^^
 note: Min Capture p[(1, 0)] -> MutBorrow
-  --> $DIR/nested-closure.rs:32:12
+  --> $DIR/nested-closure.rs:34:12
    |
 LL |         || p.y += incr;
    |            ^^^
diff --git a/tests/ui/closures/2229_closure_analysis/optimization/edge_case.rs b/tests/ui/closures/2229_closure_analysis/optimization/edge_case.rs
index e7edc0bbce39d..a7686f3b08f01 100644
--- a/tests/ui/closures/2229_closure_analysis/optimization/edge_case.rs
+++ b/tests/ui/closures/2229_closure_analysis/optimization/edge_case.rs
@@ -20,6 +20,7 @@ fn foo<'a, 'b>(m: &'a MyStruct<'b>) -> impl FnMut() + 'static {
     let c = #[rustc_capture_analysis] || drop(&m.a.0);
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     //~| ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
     //~| NOTE: Capturing m[Deref,(0, 0),Deref,(0, 0)] -> ImmBorrow
diff --git a/tests/ui/closures/2229_closure_analysis/optimization/edge_case.stderr b/tests/ui/closures/2229_closure_analysis/optimization/edge_case.stderr
index 87d5d5bee07d8..99159ab58a2b6 100644
--- a/tests/ui/closures/2229_closure_analysis/optimization/edge_case.stderr
+++ b/tests/ui/closures/2229_closure_analysis/optimization/edge_case.stderr
@@ -6,6 +6,7 @@ LL |     let c = #[rustc_capture_analysis] || drop(&m.a.0);
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
   --> $DIR/edge_case.rs:20:39
diff --git a/tests/ui/closures/2229_closure_analysis/path-with-array-access.rs b/tests/ui/closures/2229_closure_analysis/path-with-array-access.rs
index 0c10319314a6f..b8e2d6651a7fd 100644
--- a/tests/ui/closures/2229_closure_analysis/path-with-array-access.rs
+++ b/tests/ui/closures/2229_closure_analysis/path-with-array-access.rs
@@ -23,6 +23,7 @@ fn main() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/path-with-array-access.stderr b/tests/ui/closures/2229_closure_analysis/path-with-array-access.stderr
index 124b7bf6fe270..22bd13617c1ba 100644
--- a/tests/ui/closures/2229_closure_analysis/path-with-array-access.stderr
+++ b/tests/ui/closures/2229_closure_analysis/path-with-array-access.stderr
@@ -6,9 +6,10 @@ LL |     let c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/path-with-array-access.rs:26:5
+  --> $DIR/path-with-array-access.rs:27:5
    |
 LL | /     || {
 LL | |
@@ -20,13 +21,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing pent[(0, 0)] -> ImmBorrow
-  --> $DIR/path-with-array-access.rs:29:24
+  --> $DIR/path-with-array-access.rs:30:24
    |
 LL |         println!("{}", pent.points[5].x);
    |                        ^^^^^^^^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/path-with-array-access.rs:26:5
+  --> $DIR/path-with-array-access.rs:27:5
    |
 LL | /     || {
 LL | |
@@ -38,7 +39,7 @@ LL | |     };
    | |_____^
    |
 note: Min Capture pent[(0, 0)] -> ImmBorrow
-  --> $DIR/path-with-array-access.rs:29:24
+  --> $DIR/path-with-array-access.rs:30:24
    |
 LL |         println!("{}", pent.points[5].x);
    |                        ^^^^^^^^^^^
diff --git a/tests/ui/closures/2229_closure_analysis/preserve_field_drop_order.rs b/tests/ui/closures/2229_closure_analysis/preserve_field_drop_order.rs
index 2f8cddc06bab1..26c227a1edd38 100644
--- a/tests/ui/closures/2229_closure_analysis/preserve_field_drop_order.rs
+++ b/tests/ui/closures/2229_closure_analysis/preserve_field_drop_order.rs
@@ -23,6 +23,7 @@ fn test_one() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
         //~^ ERROR: Min Capture analysis includes:
         //~| ERROR
@@ -49,6 +50,7 @@ fn test_two() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
         //~^ ERROR: Min Capture analysis includes:
         //~| ERROR
@@ -75,6 +77,7 @@ fn test_three() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
         //~^ ERROR: Min Capture analysis includes:
         //~| ERROR
diff --git a/tests/ui/closures/2229_closure_analysis/preserve_field_drop_order.stderr b/tests/ui/closures/2229_closure_analysis/preserve_field_drop_order.stderr
index 2d1dc8727c255..82f770eafedac 100644
--- a/tests/ui/closures/2229_closure_analysis/preserve_field_drop_order.stderr
+++ b/tests/ui/closures/2229_closure_analysis/preserve_field_drop_order.stderr
@@ -6,27 +6,30 @@ LL |     let c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/preserve_field_drop_order.rs:49:13
+  --> $DIR/preserve_field_drop_order.rs:50:13
    |
 LL |     let c = #[rustc_capture_analysis]
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/preserve_field_drop_order.rs:75:13
+  --> $DIR/preserve_field_drop_order.rs:77:13
    |
 LL |     let c = #[rustc_capture_analysis]
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/preserve_field_drop_order.rs:26:5
+  --> $DIR/preserve_field_drop_order.rs:27:5
    |
 LL | /     || {
 LL | |
@@ -38,28 +41,28 @@ LL | |     };
    | |_____^
    |
 note: Capturing a[(0, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:29:26
+  --> $DIR/preserve_field_drop_order.rs:30:26
    |
 LL |         println!("{:?}", a.0);
    |                          ^^^
 note: Capturing a[(1, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:32:26
+  --> $DIR/preserve_field_drop_order.rs:33:26
    |
 LL |         println!("{:?}", a.1);
    |                          ^^^
 note: Capturing b[(0, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:36:26
+  --> $DIR/preserve_field_drop_order.rs:37:26
    |
 LL |         println!("{:?}", b.0);
    |                          ^^^
 note: Capturing b[(1, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:39:26
+  --> $DIR/preserve_field_drop_order.rs:40:26
    |
 LL |         println!("{:?}", b.1);
    |                          ^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/preserve_field_drop_order.rs:26:5
+  --> $DIR/preserve_field_drop_order.rs:27:5
    |
 LL | /     || {
 LL | |
@@ -71,28 +74,28 @@ LL | |     };
    | |_____^
    |
 note: Min Capture a[(0, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:29:26
+  --> $DIR/preserve_field_drop_order.rs:30:26
    |
 LL |         println!("{:?}", a.0);
    |                          ^^^
 note: Min Capture a[(1, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:32:26
+  --> $DIR/preserve_field_drop_order.rs:33:26
    |
 LL |         println!("{:?}", a.1);
    |                          ^^^
 note: Min Capture b[(0, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:36:26
+  --> $DIR/preserve_field_drop_order.rs:37:26
    |
 LL |         println!("{:?}", b.0);
    |                          ^^^
 note: Min Capture b[(1, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:39:26
+  --> $DIR/preserve_field_drop_order.rs:40:26
    |
 LL |         println!("{:?}", b.1);
    |                          ^^^
 
 error: First Pass analysis includes:
-  --> $DIR/preserve_field_drop_order.rs:52:5
+  --> $DIR/preserve_field_drop_order.rs:54:5
    |
 LL | /     || {
 LL | |
@@ -104,28 +107,28 @@ LL | |     };
    | |_____^
    |
 note: Capturing a[(1, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:55:26
+  --> $DIR/preserve_field_drop_order.rs:57:26
    |
 LL |         println!("{:?}", a.1);
    |                          ^^^
 note: Capturing a[(0, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:58:26
+  --> $DIR/preserve_field_drop_order.rs:60:26
    |
 LL |         println!("{:?}", a.0);
    |                          ^^^
 note: Capturing b[(1, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:62:26
+  --> $DIR/preserve_field_drop_order.rs:64:26
    |
 LL |         println!("{:?}", b.1);
    |                          ^^^
 note: Capturing b[(0, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:65:26
+  --> $DIR/preserve_field_drop_order.rs:67:26
    |
 LL |         println!("{:?}", b.0);
    |                          ^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/preserve_field_drop_order.rs:52:5
+  --> $DIR/preserve_field_drop_order.rs:54:5
    |
 LL | /     || {
 LL | |
@@ -137,28 +140,28 @@ LL | |     };
    | |_____^
    |
 note: Min Capture a[(0, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:58:26
+  --> $DIR/preserve_field_drop_order.rs:60:26
    |
 LL |         println!("{:?}", a.0);
    |                          ^^^
 note: Min Capture a[(1, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:55:26
+  --> $DIR/preserve_field_drop_order.rs:57:26
    |
 LL |         println!("{:?}", a.1);
    |                          ^^^
 note: Min Capture b[(0, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:65:26
+  --> $DIR/preserve_field_drop_order.rs:67:26
    |
 LL |         println!("{:?}", b.0);
    |                          ^^^
 note: Min Capture b[(1, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:62:26
+  --> $DIR/preserve_field_drop_order.rs:64:26
    |
 LL |         println!("{:?}", b.1);
    |                          ^^^
 
 error: First Pass analysis includes:
-  --> $DIR/preserve_field_drop_order.rs:78:5
+  --> $DIR/preserve_field_drop_order.rs:81:5
    |
 LL | /     || {
 LL | |
@@ -170,28 +173,28 @@ LL | |     };
    | |_____^
    |
 note: Capturing b[(1, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:81:26
+  --> $DIR/preserve_field_drop_order.rs:84:26
    |
 LL |         println!("{:?}", b.1);
    |                          ^^^
 note: Capturing a[(1, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:84:26
+  --> $DIR/preserve_field_drop_order.rs:87:26
    |
 LL |         println!("{:?}", a.1);
    |                          ^^^
 note: Capturing a[(0, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:87:26
+  --> $DIR/preserve_field_drop_order.rs:90:26
    |
 LL |         println!("{:?}", a.0);
    |                          ^^^
 note: Capturing b[(0, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:91:26
+  --> $DIR/preserve_field_drop_order.rs:94:26
    |
 LL |         println!("{:?}", b.0);
    |                          ^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/preserve_field_drop_order.rs:78:5
+  --> $DIR/preserve_field_drop_order.rs:81:5
    |
 LL | /     || {
 LL | |
@@ -203,22 +206,22 @@ LL | |     };
    | |_____^
    |
 note: Min Capture b[(0, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:91:26
+  --> $DIR/preserve_field_drop_order.rs:94:26
    |
 LL |         println!("{:?}", b.0);
    |                          ^^^
 note: Min Capture b[(1, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:81:26
+  --> $DIR/preserve_field_drop_order.rs:84:26
    |
 LL |         println!("{:?}", b.1);
    |                          ^^^
 note: Min Capture a[(0, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:87:26
+  --> $DIR/preserve_field_drop_order.rs:90:26
    |
 LL |         println!("{:?}", a.0);
    |                          ^^^
 note: Min Capture a[(1, 0)] -> ImmBorrow
-  --> $DIR/preserve_field_drop_order.rs:84:26
+  --> $DIR/preserve_field_drop_order.rs:87:26
    |
 LL |         println!("{:?}", a.1);
    |                          ^^^
diff --git a/tests/ui/closures/2229_closure_analysis/repr_packed.rs b/tests/ui/closures/2229_closure_analysis/repr_packed.rs
index 8c23454fae987..3ed8587783e4d 100644
--- a/tests/ui/closures/2229_closure_analysis/repr_packed.rs
+++ b/tests/ui/closures/2229_closure_analysis/repr_packed.rs
@@ -14,6 +14,7 @@ fn test_alignment_not_affected() {
     let mut c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
@@ -44,6 +45,7 @@ fn test_alignment_affected() {
     let mut c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
@@ -79,6 +81,7 @@ fn test_truncation_when_ref_and_move() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/repr_packed.stderr b/tests/ui/closures/2229_closure_analysis/repr_packed.stderr
index 32b3d844c6e72..3bac41d60d562 100644
--- a/tests/ui/closures/2229_closure_analysis/repr_packed.stderr
+++ b/tests/ui/closures/2229_closure_analysis/repr_packed.stderr
@@ -6,27 +6,30 @@ LL |     let mut c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/repr_packed.rs:44:17
+  --> $DIR/repr_packed.rs:45:17
    |
 LL |     let mut c = #[rustc_capture_analysis]
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/repr_packed.rs:79:13
+  --> $DIR/repr_packed.rs:81:13
    |
 LL |     let c = #[rustc_capture_analysis]
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/repr_packed.rs:17:5
+  --> $DIR/repr_packed.rs:18:5
    |
 LL | /     || {
 LL | |
@@ -38,18 +41,18 @@ LL | |     };
    | |_____^
    |
 note: Capturing foo[] -> ImmBorrow
-  --> $DIR/repr_packed.rs:20:24
+  --> $DIR/repr_packed.rs:21:24
    |
 LL |         let z1: &u8 = &foo.x;
    |                        ^^^^^
 note: Capturing foo[] -> MutBorrow
-  --> $DIR/repr_packed.rs:22:32
+  --> $DIR/repr_packed.rs:23:32
    |
 LL |         let z2: &mut u8 = &mut foo.y;
    |                                ^^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/repr_packed.rs:17:5
+  --> $DIR/repr_packed.rs:18:5
    |
 LL | /     || {
 LL | |
@@ -61,13 +64,13 @@ LL | |     };
    | |_____^
    |
 note: Min Capture foo[] -> MutBorrow
-  --> $DIR/repr_packed.rs:22:32
+  --> $DIR/repr_packed.rs:23:32
    |
 LL |         let z2: &mut u8 = &mut foo.y;
    |                                ^^^^^
 
 error: First Pass analysis includes:
-  --> $DIR/repr_packed.rs:47:5
+  --> $DIR/repr_packed.rs:49:5
    |
 LL | /     || {
 LL | |
@@ -79,18 +82,18 @@ LL | |     };
    | |_____^
    |
 note: Capturing foo[] -> ImmBorrow
-  --> $DIR/repr_packed.rs:50:28
+  --> $DIR/repr_packed.rs:52:28
    |
 LL |         let z1: &String = &foo.x;
    |                            ^^^^^
 note: Capturing foo[] -> MutBorrow
-  --> $DIR/repr_packed.rs:52:33
+  --> $DIR/repr_packed.rs:54:33
    |
 LL |         let z2: &mut u16 = &mut foo.y;
    |                                 ^^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/repr_packed.rs:47:5
+  --> $DIR/repr_packed.rs:49:5
    |
 LL | /     || {
 LL | |
@@ -102,13 +105,13 @@ LL | |     };
    | |_____^
    |
 note: Min Capture foo[] -> MutBorrow
-  --> $DIR/repr_packed.rs:52:33
+  --> $DIR/repr_packed.rs:54:33
    |
 LL |         let z2: &mut u16 = &mut foo.y;
    |                                 ^^^^^
 
 error: First Pass analysis includes:
-  --> $DIR/repr_packed.rs:82:5
+  --> $DIR/repr_packed.rs:85:5
    |
 LL | /     || {
 LL | |
@@ -120,18 +123,18 @@ LL | |     };
    | |_____^
    |
 note: Capturing foo[] -> ImmBorrow
-  --> $DIR/repr_packed.rs:85:24
+  --> $DIR/repr_packed.rs:88:24
    |
 LL |         println!("{}", foo.x);
    |                        ^^^^^
 note: Capturing foo[(0, 0)] -> ByValue
-  --> $DIR/repr_packed.rs:89:18
+  --> $DIR/repr_packed.rs:92:18
    |
 LL |         let _z = foo.x;
    |                  ^^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/repr_packed.rs:82:5
+  --> $DIR/repr_packed.rs:85:5
    |
 LL | /     || {
 LL | |
@@ -143,7 +146,7 @@ LL | |     };
    | |_____^
    |
 note: Min Capture foo[] -> ByValue
-  --> $DIR/repr_packed.rs:85:24
+  --> $DIR/repr_packed.rs:88:24
    |
 LL |         println!("{}", foo.x);
    |                        ^^^^^ foo[] used here
diff --git a/tests/ui/closures/2229_closure_analysis/simple-struct-min-capture.rs b/tests/ui/closures/2229_closure_analysis/simple-struct-min-capture.rs
index 563095d440d24..03b70383e5411 100644
--- a/tests/ui/closures/2229_closure_analysis/simple-struct-min-capture.rs
+++ b/tests/ui/closures/2229_closure_analysis/simple-struct-min-capture.rs
@@ -23,6 +23,7 @@ fn main() {
     let mut c = #[rustc_capture_analysis]
         //~^ ERROR: attributes on expressions are experimental
         //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+        //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/simple-struct-min-capture.stderr b/tests/ui/closures/2229_closure_analysis/simple-struct-min-capture.stderr
index 05d79797ab3c0..247dcbe94bcec 100644
--- a/tests/ui/closures/2229_closure_analysis/simple-struct-min-capture.stderr
+++ b/tests/ui/closures/2229_closure_analysis/simple-struct-min-capture.stderr
@@ -6,9 +6,10 @@ LL |     let mut c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/simple-struct-min-capture.rs:26:5
+  --> $DIR/simple-struct-min-capture.rs:27:5
    |
 LL | /     || {
 LL | |
@@ -20,18 +21,18 @@ LL | |     };
    | |_____^
    |
 note: Capturing p[(0, 0)] -> MutBorrow
-  --> $DIR/simple-struct-min-capture.rs:29:9
+  --> $DIR/simple-struct-min-capture.rs:30:9
    |
 LL |         p.x += 10;
    |         ^^^
 note: Capturing p[] -> ImmBorrow
-  --> $DIR/simple-struct-min-capture.rs:32:26
+  --> $DIR/simple-struct-min-capture.rs:33:26
    |
 LL |         println!("{:?}", p);
    |                          ^
 
 error: Min Capture analysis includes:
-  --> $DIR/simple-struct-min-capture.rs:26:5
+  --> $DIR/simple-struct-min-capture.rs:27:5
    |
 LL | /     || {
 LL | |
@@ -43,7 +44,7 @@ LL | |     };
    | |_____^
    |
 note: Min Capture p[] -> MutBorrow
-  --> $DIR/simple-struct-min-capture.rs:29:9
+  --> $DIR/simple-struct-min-capture.rs:30:9
    |
 LL |         p.x += 10;
    |         ^^^ p[] captured as MutBorrow here
diff --git a/tests/ui/closures/2229_closure_analysis/unsafe_ptr.rs b/tests/ui/closures/2229_closure_analysis/unsafe_ptr.rs
index eab9f9d08a9f6..1f87c9b99925d 100644
--- a/tests/ui/closures/2229_closure_analysis/unsafe_ptr.rs
+++ b/tests/ui/closures/2229_closure_analysis/unsafe_ptr.rs
@@ -25,6 +25,7 @@ fn unsafe_imm() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
      || unsafe {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
@@ -45,6 +46,7 @@ fn unsafe_mut() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/unsafe_ptr.stderr b/tests/ui/closures/2229_closure_analysis/unsafe_ptr.stderr
index e740a4d2d6b80..4f3de075054c7 100644
--- a/tests/ui/closures/2229_closure_analysis/unsafe_ptr.stderr
+++ b/tests/ui/closures/2229_closure_analysis/unsafe_ptr.stderr
@@ -6,18 +6,20 @@ LL |     let c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/unsafe_ptr.rs:45:13
+  --> $DIR/unsafe_ptr.rs:46:13
    |
 LL |     let c = #[rustc_capture_analysis]
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/unsafe_ptr.rs:28:6
+  --> $DIR/unsafe_ptr.rs:29:6
    |
 LL | /      || unsafe {
 LL | |
@@ -29,13 +31,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing t[(0, 0),Deref,(0, 0)] -> ImmBorrow
-  --> $DIR/unsafe_ptr.rs:31:26
+  --> $DIR/unsafe_ptr.rs:32:26
    |
 LL |         println!("{:?}", (*t.0).s);
    |                          ^^^^^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/unsafe_ptr.rs:28:6
+  --> $DIR/unsafe_ptr.rs:29:6
    |
 LL | /      || unsafe {
 LL | |
@@ -47,13 +49,13 @@ LL | |     };
    | |_____^
    |
 note: Min Capture t[(0, 0)] -> ImmBorrow
-  --> $DIR/unsafe_ptr.rs:31:26
+  --> $DIR/unsafe_ptr.rs:32:26
    |
 LL |         println!("{:?}", (*t.0).s);
    |                          ^^^^^^^^
 
 error: First Pass analysis includes:
-  --> $DIR/unsafe_ptr.rs:48:5
+  --> $DIR/unsafe_ptr.rs:50:5
    |
 LL | /     || {
 LL | |
@@ -65,13 +67,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing p[Deref,(0, 0)] -> ImmBorrow
-  --> $DIR/unsafe_ptr.rs:51:31
+  --> $DIR/unsafe_ptr.rs:53:31
    |
 LL |         let x = unsafe { &mut (*p).s };
    |                               ^^^^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/unsafe_ptr.rs:48:5
+  --> $DIR/unsafe_ptr.rs:50:5
    |
 LL | /     || {
 LL | |
@@ -83,7 +85,7 @@ LL | |     };
    | |_____^
    |
 note: Min Capture p[] -> ImmBorrow
-  --> $DIR/unsafe_ptr.rs:51:31
+  --> $DIR/unsafe_ptr.rs:53:31
    |
 LL |         let x = unsafe { &mut (*p).s };
    |                               ^^^^^^
diff --git a/tests/ui/closures/2229_closure_analysis/wild_patterns.rs b/tests/ui/closures/2229_closure_analysis/wild_patterns.rs
index a795088a1d945..12695929fced6 100644
--- a/tests/ui/closures/2229_closure_analysis/wild_patterns.rs
+++ b/tests/ui/closures/2229_closure_analysis/wild_patterns.rs
@@ -22,6 +22,7 @@ fn wild_struct() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
@@ -40,6 +41,7 @@ fn wild_tuple() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
@@ -58,6 +60,7 @@ fn wild_arr() {
     let c = #[rustc_capture_analysis]
     //~^ ERROR: attributes on expressions are experimental
     //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     || {
     //~^ ERROR: First Pass analysis includes:
     //~| ERROR: Min Capture analysis includes:
diff --git a/tests/ui/closures/2229_closure_analysis/wild_patterns.stderr b/tests/ui/closures/2229_closure_analysis/wild_patterns.stderr
index c64378091e6e0..88b48aaaf8c23 100644
--- a/tests/ui/closures/2229_closure_analysis/wild_patterns.stderr
+++ b/tests/ui/closures/2229_closure_analysis/wild_patterns.stderr
@@ -6,27 +6,30 @@ LL |     let c = #[rustc_capture_analysis]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/wild_patterns.rs:40:13
+  --> $DIR/wild_patterns.rs:41:13
    |
 LL |     let c = #[rustc_capture_analysis]
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
-  --> $DIR/wild_patterns.rs:58:13
+  --> $DIR/wild_patterns.rs:60:13
    |
 LL |     let c = #[rustc_capture_analysis]
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: First Pass analysis includes:
-  --> $DIR/wild_patterns.rs:25:5
+  --> $DIR/wild_patterns.rs:26:5
    |
 LL | /     || {
 LL | |
@@ -38,13 +41,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing p[(0, 0)] -> ImmBorrow
-  --> $DIR/wild_patterns.rs:29:37
+  --> $DIR/wild_patterns.rs:30:37
    |
 LL |         let Point { x: _x, y: _ } = p;
    |                                     ^
 
 error: Min Capture analysis includes:
-  --> $DIR/wild_patterns.rs:25:5
+  --> $DIR/wild_patterns.rs:26:5
    |
 LL | /     || {
 LL | |
@@ -56,13 +59,13 @@ LL | |     };
    | |_____^
    |
 note: Min Capture p[(0, 0)] -> ImmBorrow
-  --> $DIR/wild_patterns.rs:29:37
+  --> $DIR/wild_patterns.rs:30:37
    |
 LL |         let Point { x: _x, y: _ } = p;
    |                                     ^
 
 error: First Pass analysis includes:
-  --> $DIR/wild_patterns.rs:43:5
+  --> $DIR/wild_patterns.rs:45:5
    |
 LL | /     || {
 LL | |
@@ -74,13 +77,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing t[(0, 0)] -> ByValue
-  --> $DIR/wild_patterns.rs:47:23
+  --> $DIR/wild_patterns.rs:49:23
    |
 LL |         let (_x, _) = t;
    |                       ^
 
 error: Min Capture analysis includes:
-  --> $DIR/wild_patterns.rs:43:5
+  --> $DIR/wild_patterns.rs:45:5
    |
 LL | /     || {
 LL | |
@@ -92,13 +95,13 @@ LL | |     };
    | |_____^
    |
 note: Min Capture t[(0, 0)] -> ByValue
-  --> $DIR/wild_patterns.rs:47:23
+  --> $DIR/wild_patterns.rs:49:23
    |
 LL |         let (_x, _) = t;
    |                       ^
 
 error: First Pass analysis includes:
-  --> $DIR/wild_patterns.rs:61:5
+  --> $DIR/wild_patterns.rs:64:5
    |
 LL | /     || {
 LL | |
@@ -110,13 +113,13 @@ LL | |     };
    | |_____^
    |
 note: Capturing arr[Index] -> ByValue
-  --> $DIR/wild_patterns.rs:65:23
+  --> $DIR/wild_patterns.rs:68:23
    |
 LL |         let [_x, _] = arr;
    |                       ^^^
 
 error: Min Capture analysis includes:
-  --> $DIR/wild_patterns.rs:61:5
+  --> $DIR/wild_patterns.rs:64:5
    |
 LL | /     || {
 LL | |
@@ -128,7 +131,7 @@ LL | |     };
    | |_____^
    |
 note: Min Capture arr[] -> ByValue
-  --> $DIR/wild_patterns.rs:65:23
+  --> $DIR/wild_patterns.rs:68:23
    |
 LL |         let [_x, _] = arr;
    |                       ^^^
diff --git a/tests/ui/closures/binder/disallow-const.stderr b/tests/ui/closures/binder/disallow-const.stderr
index d38b233d99a8a..fa56ec863126b 100644
--- a/tests/ui/closures/binder/disallow-const.stderr
+++ b/tests/ui/closures/binder/disallow-const.stderr
@@ -6,6 +6,7 @@ LL |     for<const N: i32> || -> () {};
    |
    = note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information
    = help: add `#![feature(non_lifetime_binders)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/closures/binder/disallow-ty.stderr b/tests/ui/closures/binder/disallow-ty.stderr
index bc6696ad36b41..f8a33e08f75e1 100644
--- a/tests/ui/closures/binder/disallow-ty.stderr
+++ b/tests/ui/closures/binder/disallow-ty.stderr
@@ -6,6 +6,7 @@ LL |     for<T> || -> () {};
    |
    = note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information
    = help: add `#![feature(non_lifetime_binders)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/cmse-nonsecure/cmse-nonsecure-call/gate_test.stderr b/tests/ui/cmse-nonsecure/cmse-nonsecure-call/gate_test.stderr
index 0a5884d38f78a..64e9b7cc63959 100644
--- a/tests/ui/cmse-nonsecure/cmse-nonsecure-call/gate_test.stderr
+++ b/tests/ui/cmse-nonsecure/cmse-nonsecure-call/gate_test.stderr
@@ -6,6 +6,7 @@ LL |         core::mem::transmute::<usize, extern "C-cmse-nonsecure-call" fn(i32
    |
    = note: see issue #81391 <https://github.com/rust-lang/rust/issues/81391> for more information
    = help: add `#![feature(abi_c_cmse_nonsecure_call)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/cmse-nonsecure/cmse-nonsecure-entry/gate_test.stderr b/tests/ui/cmse-nonsecure/cmse-nonsecure-entry/gate_test.stderr
index 75a29b317df87..beb9716d5906b 100644
--- a/tests/ui/cmse-nonsecure/cmse-nonsecure-entry/gate_test.stderr
+++ b/tests/ui/cmse-nonsecure/cmse-nonsecure-entry/gate_test.stderr
@@ -6,6 +6,7 @@ LL | #[cmse_nonsecure_entry]
    |
    = note: see issue #75835 <https://github.com/rust-lang/rust/issues/75835> for more information
    = help: add `#![feature(cmse_nonsecure_entry)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0775]: `#[cmse_nonsecure_entry]` is only valid for targets with the TrustZone-M extension
   --> $DIR/gate_test.rs:4:1
diff --git a/tests/ui/conditional-compilation/cfg-attr-crate-2.stderr b/tests/ui/conditional-compilation/cfg-attr-crate-2.stderr
index 82dc436199909..742764fe0efdd 100644
--- a/tests/ui/conditional-compilation/cfg-attr-crate-2.stderr
+++ b/tests/ui/conditional-compilation/cfg-attr-crate-2.stderr
@@ -6,6 +6,7 @@ LL | #![cfg_attr(broken, no_core)]
    |
    = note: see issue #29639 <https://github.com/rust-lang/rust/issues/29639> for more information
    = help: add `#![feature(no_core)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/conditional-compilation/cfg-attr-multi-invalid-1.stderr b/tests/ui/conditional-compilation/cfg-attr-multi-invalid-1.stderr
index daba4eb1a63df..7827552096c1f 100644
--- a/tests/ui/conditional-compilation/cfg-attr-multi-invalid-1.stderr
+++ b/tests/ui/conditional-compilation/cfg-attr-multi-invalid-1.stderr
@@ -6,6 +6,7 @@ LL | #![cfg_attr(broken, no_core, no_std)]
    |
    = note: see issue #29639 <https://github.com/rust-lang/rust/issues/29639> for more information
    = help: add `#![feature(no_core)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/conditional-compilation/cfg-attr-multi-invalid-2.stderr b/tests/ui/conditional-compilation/cfg-attr-multi-invalid-2.stderr
index 675792d2e3219..d8768c3f31038 100644
--- a/tests/ui/conditional-compilation/cfg-attr-multi-invalid-2.stderr
+++ b/tests/ui/conditional-compilation/cfg-attr-multi-invalid-2.stderr
@@ -6,6 +6,7 @@ LL | #![cfg_attr(broken, no_std, no_core)]
    |
    = note: see issue #29639 <https://github.com/rust-lang/rust/issues/29639> for more information
    = help: add `#![feature(no_core)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/conditional-compilation/cfg-generic-params.stderr b/tests/ui/conditional-compilation/cfg-generic-params.stderr
index f733c09c22e6b..4143e2019aede 100644
--- a/tests/ui/conditional-compilation/cfg-generic-params.stderr
+++ b/tests/ui/conditional-compilation/cfg-generic-params.stderr
@@ -36,6 +36,7 @@ LL | type FnBad = for<#[cfg(no)] 'a, #[cfg(yes)] T> fn();
    |
    = note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information
    = help: add `#![feature(non_lifetime_binders)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: only lifetime parameters can be used in this context
   --> $DIR/cfg-generic-params.rs:11:51
@@ -45,6 +46,7 @@ LL | type PolyBad = dyn for<#[cfg(no)] 'a, #[cfg(yes)] T> Copy;
    |
    = note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information
    = help: add `#![feature(non_lifetime_binders)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: only lifetime parameters can be used in this context
   --> $DIR/cfg-generic-params.rs:15:54
@@ -54,6 +56,7 @@ LL | struct WhereBad where for<#[cfg(no)] 'a, #[cfg(yes)] T> u8: Copy;
    |
    = note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information
    = help: add `#![feature(non_lifetime_binders)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 8 previous errors
 
diff --git a/tests/ui/conditional-compilation/cfg_accessible-unstable.stderr b/tests/ui/conditional-compilation/cfg_accessible-unstable.stderr
index f034419097679..201f6a13f1faf 100644
--- a/tests/ui/conditional-compilation/cfg_accessible-unstable.stderr
+++ b/tests/ui/conditional-compilation/cfg_accessible-unstable.stderr
@@ -6,6 +6,7 @@ LL | #[cfg_accessible(std)]
    |
    = note: see issue #64797 <https://github.com/rust-lang/rust/issues/64797> for more information
    = help: add `#![feature(cfg_accessible)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/const-generics/parser-error-recovery/issue-89013-no-kw.stderr b/tests/ui/const-generics/parser-error-recovery/issue-89013-no-kw.stderr
index 4f4e1aa3a046f..92dedd74feb50 100644
--- a/tests/ui/const-generics/parser-error-recovery/issue-89013-no-kw.stderr
+++ b/tests/ui/const-generics/parser-error-recovery/issue-89013-no-kw.stderr
@@ -6,6 +6,7 @@ LL | impl Foo<N = 3> for Bar {
    |
    = note: see issue #92827 <https://github.com/rust-lang/rust/issues/92827> for more information
    = help: add `#![feature(associated_const_equality)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0107]: trait takes 1 generic argument but 0 generic arguments were supplied
   --> $DIR/issue-89013-no-kw.rs:9:6
diff --git a/tests/ui/const-generics/parser-error-recovery/issue-89013.stderr b/tests/ui/const-generics/parser-error-recovery/issue-89013.stderr
index 3d2b98feb39c0..801d14b395054 100644
--- a/tests/ui/const-generics/parser-error-recovery/issue-89013.stderr
+++ b/tests/ui/const-generics/parser-error-recovery/issue-89013.stderr
@@ -18,6 +18,7 @@ LL | impl Foo<N = const 3> for Bar {
    |
    = note: see issue #92827 <https://github.com/rust-lang/rust/issues/92827> for more information
    = help: add `#![feature(associated_const_equality)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0107]: trait takes 1 generic argument but 0 generic arguments were supplied
   --> $DIR/issue-89013.rs:9:6
diff --git a/tests/ui/consts/async-block.without_feature.stderr b/tests/ui/consts/async-block.without_feature.stderr
index 751627c522649..d31e88724bb5c 100644
--- a/tests/ui/consts/async-block.without_feature.stderr
+++ b/tests/ui/consts/async-block.without_feature.stderr
@@ -6,6 +6,7 @@ LL | const _: i32 = { core::mem::ManuallyDrop::new(async { 0 }); 4 };
    |
    = note: see issue #85368 <https://github.com/rust-lang/rust/issues/85368> for more information
    = help: add `#![feature(const_async_blocks)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `async` blocks are not allowed in statics
   --> $DIR/async-block.rs:15:51
@@ -15,6 +16,7 @@ LL | static _FUT: &(dyn Future<Output = ()> + Sync) = &async {};
    |
    = note: see issue #85368 <https://github.com/rust-lang/rust/issues/85368> for more information
    = help: add `#![feature(const_async_blocks)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/consts/const-address-of-interior-mut.stderr b/tests/ui/consts/const-address-of-interior-mut.stderr
index 93120753b1a08..12c8917d740fa 100644
--- a/tests/ui/consts/const-address-of-interior-mut.stderr
+++ b/tests/ui/consts/const-address-of-interior-mut.stderr
@@ -6,6 +6,7 @@ LL | const A: () = { let x = Cell::new(2); &raw const x; };
    |
    = note: see issue #80384 <https://github.com/rust-lang/rust/issues/80384> for more information
    = help: add `#![feature(const_refs_to_cell)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: cannot borrow here, since the borrowed element may contain interior mutability
   --> $DIR/const-address-of-interior-mut.rs:7:40
@@ -15,6 +16,7 @@ LL | static B: () = { let x = Cell::new(2); &raw const x; };
    |
    = note: see issue #80384 <https://github.com/rust-lang/rust/issues/80384> for more information
    = help: add `#![feature(const_refs_to_cell)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: cannot borrow here, since the borrowed element may contain interior mutability
   --> $DIR/const-address-of-interior-mut.rs:9:44
@@ -24,6 +26,7 @@ LL | static mut C: () = { let x = Cell::new(2); &raw const x; };
    |
    = note: see issue #80384 <https://github.com/rust-lang/rust/issues/80384> for more information
    = help: add `#![feature(const_refs_to_cell)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: cannot borrow here, since the borrowed element may contain interior mutability
   --> $DIR/const-address-of-interior-mut.rs:13:13
@@ -33,6 +36,7 @@ LL |     let y = &raw const x;
    |
    = note: see issue #80384 <https://github.com/rust-lang/rust/issues/80384> for more information
    = help: add `#![feature(const_refs_to_cell)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 4 previous errors
 
diff --git a/tests/ui/consts/const-address-of-mut.stderr b/tests/ui/consts/const-address-of-mut.stderr
index 60cdcc7df7449..2a69bb8be97d4 100644
--- a/tests/ui/consts/const-address-of-mut.stderr
+++ b/tests/ui/consts/const-address-of-mut.stderr
@@ -6,6 +6,7 @@ LL | const A: () = { let mut x = 2; &raw mut x; };
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: raw mutable references are not allowed in statics
   --> $DIR/const-address-of-mut.rs:5:33
@@ -15,6 +16,7 @@ LL | static B: () = { let mut x = 2; &raw mut x; };
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: raw mutable references are not allowed in statics
   --> $DIR/const-address-of-mut.rs:7:37
@@ -24,6 +26,7 @@ LL | static mut C: () = { let mut x = 2; &raw mut x; };
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: raw mutable references are not allowed in constant functions
   --> $DIR/const-address-of-mut.rs:11:13
@@ -33,6 +36,7 @@ LL |     let y = &raw mut x;
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 4 previous errors
 
diff --git a/tests/ui/consts/const-eval/issue-114994-fail.stderr b/tests/ui/consts/const-eval/issue-114994-fail.stderr
index 4dae8ea9bcab3..70b224b9b4c9b 100644
--- a/tests/ui/consts/const-eval/issue-114994-fail.stderr
+++ b/tests/ui/consts/const-eval/issue-114994-fail.stderr
@@ -6,6 +6,7 @@ LL | const fn use_mut_const_fn(_f: &mut fn(&mut String)) {
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: mutable references are not allowed in constant functions
   --> $DIR/issue-114994-fail.rs:10:33
@@ -15,6 +16,7 @@ LL | const fn use_mut_const_tuple_fn(_f: (fn(), &mut u32)) {
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/consts/const-eval/issue-65394.stderr b/tests/ui/consts/const-eval/issue-65394.stderr
index ae6f0e9371680..1fa4da4a78be4 100644
--- a/tests/ui/consts/const-eval/issue-65394.stderr
+++ b/tests/ui/consts/const-eval/issue-65394.stderr
@@ -6,6 +6,7 @@ LL |     let r = &mut x;
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0493]: destructor of `Vec<i32>` cannot be evaluated at compile-time
   --> $DIR/issue-65394.rs:7:9
diff --git a/tests/ui/consts/const-extern-fn/const-extern-fn-min-const-fn.stderr b/tests/ui/consts/const-extern-fn/const-extern-fn-min-const-fn.stderr
index 4bab466fb95a7..29fa90d611c60 100644
--- a/tests/ui/consts/const-extern-fn/const-extern-fn-min-const-fn.stderr
+++ b/tests/ui/consts/const-extern-fn/const-extern-fn-min-const-fn.stderr
@@ -6,6 +6,7 @@ LL | const unsafe extern "C" fn use_float() { 1.0 + 1.0; }
    |
    = note: see issue #57241 <https://github.com/rust-lang/rust/issues/57241> for more information
    = help: add `#![feature(const_fn_floating_point_arithmetic)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: pointers cannot be cast to integers during const eval
   --> $DIR/const-extern-fn-min-const-fn.rs:7:48
diff --git a/tests/ui/consts/const-extern-fn/feature-gate-const_extern_fn.stderr b/tests/ui/consts/const-extern-fn/feature-gate-const_extern_fn.stderr
index f8c3107bd221a..81fb62e10a724 100644
--- a/tests/ui/consts/const-extern-fn/feature-gate-const_extern_fn.stderr
+++ b/tests/ui/consts/const-extern-fn/feature-gate-const_extern_fn.stderr
@@ -6,6 +6,7 @@ LL | const extern "cdecl" fn foo4() {}
    |
    = note: see issue #64926 <https://github.com/rust-lang/rust/issues/64926> for more information
    = help: add `#![feature(const_extern_fn)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `cdecl` as a `const fn` ABI is unstable
   --> $DIR/feature-gate-const_extern_fn.rs:11:21
@@ -15,6 +16,7 @@ LL | const unsafe extern "cdecl" fn bar4() {}
    |
    = note: see issue #64926 <https://github.com/rust-lang/rust/issues/64926> for more information
    = help: add `#![feature(const_extern_fn)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/consts/const-fn-error.stderr b/tests/ui/consts/const-fn-error.stderr
index f735b3d53ce43..68c335c71d958 100644
--- a/tests/ui/consts/const-fn-error.stderr
+++ b/tests/ui/consts/const-fn-error.stderr
@@ -12,6 +12,7 @@ LL | |     }
    |
    = note: see issue #87575 <https://github.com/rust-lang/rust/issues/87575> for more information
    = help: add `#![feature(const_for)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0015]: cannot convert `std::ops::Range<usize>` into an iterator in constant functions
   --> $DIR/const-fn-error.rs:5:14
@@ -32,6 +33,7 @@ LL |     for i in 0..x {
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0015]: cannot call non-const fn `<std::ops::Range<usize> as Iterator>::next` in constant functions
   --> $DIR/const-fn-error.rs:5:14
diff --git a/tests/ui/consts/const-for-feature-gate.stderr b/tests/ui/consts/const-for-feature-gate.stderr
index 0c24bbad7dd43..df79c00f024fd 100644
--- a/tests/ui/consts/const-for-feature-gate.stderr
+++ b/tests/ui/consts/const-for-feature-gate.stderr
@@ -6,6 +6,7 @@ LL |     for _ in 0..5 {}
    |
    = note: see issue #87575 <https://github.com/rust-lang/rust/issues/87575> for more information
    = help: add `#![feature(const_for)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/consts/const-multi-ref.stderr b/tests/ui/consts/const-multi-ref.stderr
index dd5cadfe2951e..516162194cdf8 100644
--- a/tests/ui/consts/const-multi-ref.stderr
+++ b/tests/ui/consts/const-multi-ref.stderr
@@ -6,6 +6,7 @@ LL |     let p = &mut a;
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: cannot borrow here, since the borrowed element may contain interior mutability
   --> $DIR/const-multi-ref.rs:16:13
@@ -15,6 +16,7 @@ LL |     let p = &a;
    |
    = note: see issue #80384 <https://github.com/rust-lang/rust/issues/80384> for more information
    = help: add `#![feature(const_refs_to_cell)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/consts/const-mut-refs/feature-gate-const_mut_refs.stderr b/tests/ui/consts/const-mut-refs/feature-gate-const_mut_refs.stderr
index 7d8d062dbbed4..212d172fe1316 100644
--- a/tests/ui/consts/const-mut-refs/feature-gate-const_mut_refs.stderr
+++ b/tests/ui/consts/const-mut-refs/feature-gate-const_mut_refs.stderr
@@ -6,6 +6,7 @@ LL | const fn foo(x: &mut i32) -> i32 {
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/consts/const-mut-refs/issue-76510.32bit.stderr b/tests/ui/consts/const-mut-refs/issue-76510.32bit.stderr
index 61b00be345fee..dc04d85770e7b 100644
--- a/tests/ui/consts/const-mut-refs/issue-76510.32bit.stderr
+++ b/tests/ui/consts/const-mut-refs/issue-76510.32bit.stderr
@@ -12,6 +12,7 @@ LL | const S: &'static mut str = &mut " hello ";
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0596]: cannot borrow data in a `&` reference as mutable
   --> $DIR/issue-76510.rs:5:29
diff --git a/tests/ui/consts/const-mut-refs/issue-76510.64bit.stderr b/tests/ui/consts/const-mut-refs/issue-76510.64bit.stderr
index 61b00be345fee..dc04d85770e7b 100644
--- a/tests/ui/consts/const-mut-refs/issue-76510.64bit.stderr
+++ b/tests/ui/consts/const-mut-refs/issue-76510.64bit.stderr
@@ -12,6 +12,7 @@ LL | const S: &'static mut str = &mut " hello ";
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0596]: cannot borrow data in a `&` reference as mutable
   --> $DIR/issue-76510.rs:5:29
diff --git a/tests/ui/consts/const-suggest-feature.stderr b/tests/ui/consts/const-suggest-feature.stderr
index d4a42a880e328..faa1226ca2540 100644
--- a/tests/ui/consts/const-suggest-feature.stderr
+++ b/tests/ui/consts/const-suggest-feature.stderr
@@ -6,6 +6,7 @@ LL |     *std::ptr::null_mut() = 0;
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/consts/const-try-feature-gate.stderr b/tests/ui/consts/const-try-feature-gate.stderr
index 79c6ec108b966..c5aeed3317cca 100644
--- a/tests/ui/consts/const-try-feature-gate.stderr
+++ b/tests/ui/consts/const-try-feature-gate.stderr
@@ -6,6 +6,7 @@ LL |     Some(())?;
    |
    = note: see issue #74935 <https://github.com/rust-lang/rust/issues/74935> for more information
    = help: add `#![feature(const_try)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/consts/const_fn_floating_point_arithmetic.stock.stderr b/tests/ui/consts/const_fn_floating_point_arithmetic.stock.stderr
index ef7a60faf3f5c..b5b94786ebb91 100644
--- a/tests/ui/consts/const_fn_floating_point_arithmetic.stock.stderr
+++ b/tests/ui/consts/const_fn_floating_point_arithmetic.stock.stderr
@@ -6,6 +6,7 @@ LL | const fn add(f: f32) -> f32 { f + 2.0 }
    |
    = note: see issue #57241 <https://github.com/rust-lang/rust/issues/57241> for more information
    = help: add `#![feature(const_fn_floating_point_arithmetic)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: floating point arithmetic is not allowed in constant functions
   --> $DIR/const_fn_floating_point_arithmetic.rs:10:31
@@ -15,6 +16,7 @@ LL | const fn sub(f: f32) -> f32 { 2.0 - f }
    |
    = note: see issue #57241 <https://github.com/rust-lang/rust/issues/57241> for more information
    = help: add `#![feature(const_fn_floating_point_arithmetic)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: floating point arithmetic is not allowed in constant functions
   --> $DIR/const_fn_floating_point_arithmetic.rs:12:39
@@ -24,6 +26,7 @@ LL | const fn mul(f: f32, g: f32) -> f32 { f * g }
    |
    = note: see issue #57241 <https://github.com/rust-lang/rust/issues/57241> for more information
    = help: add `#![feature(const_fn_floating_point_arithmetic)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: floating point arithmetic is not allowed in constant functions
   --> $DIR/const_fn_floating_point_arithmetic.rs:14:39
@@ -33,6 +36,7 @@ LL | const fn div(f: f32, g: f32) -> f32 { f / g }
    |
    = note: see issue #57241 <https://github.com/rust-lang/rust/issues/57241> for more information
    = help: add `#![feature(const_fn_floating_point_arithmetic)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: floating point arithmetic is not allowed in constant functions
   --> $DIR/const_fn_floating_point_arithmetic.rs:16:31
@@ -42,6 +46,7 @@ LL | const fn neg(f: f32) -> f32 { -f }
    |
    = note: see issue #57241 <https://github.com/rust-lang/rust/issues/57241> for more information
    = help: add `#![feature(const_fn_floating_point_arithmetic)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 5 previous errors
 
diff --git a/tests/ui/consts/const_let_assign3.stderr b/tests/ui/consts/const_let_assign3.stderr
index 89073f975e880..40c11acee5c9e 100644
--- a/tests/ui/consts/const_let_assign3.stderr
+++ b/tests/ui/consts/const_let_assign3.stderr
@@ -6,6 +6,7 @@ LL |     const fn foo(&mut self, x: u32) {
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: mutable references are not allowed in constants
   --> $DIR/const_let_assign3.rs:14:5
@@ -15,6 +16,7 @@ LL |     s.foo(3);
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: mutable references are not allowed in constants
   --> $DIR/const_let_assign3.rs:20:13
@@ -24,6 +26,7 @@ LL |     let y = &mut x;
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/consts/control-flow/loop.stderr b/tests/ui/consts/control-flow/loop.stderr
index 5f6ad8c105d74..725adf723392d 100644
--- a/tests/ui/consts/control-flow/loop.stderr
+++ b/tests/ui/consts/control-flow/loop.stderr
@@ -8,6 +8,7 @@ LL | |     }
    |
    = note: see issue #87575 <https://github.com/rust-lang/rust/issues/87575> for more information
    = help: add `#![feature(const_for)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `for` is not allowed in a `const`
   --> $DIR/loop.rs:57:5
@@ -19,6 +20,7 @@ LL | |     }
    |
    = note: see issue #87575 <https://github.com/rust-lang/rust/issues/87575> for more information
    = help: add `#![feature(const_for)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/consts/control-flow/try.stderr b/tests/ui/consts/control-flow/try.stderr
index 7351f5c0a6f96..f4b88de9dfab3 100644
--- a/tests/ui/consts/control-flow/try.stderr
+++ b/tests/ui/consts/control-flow/try.stderr
@@ -6,6 +6,7 @@ LL |     x?;
    |
    = note: see issue #74935 <https://github.com/rust-lang/rust/issues/74935> for more information
    = help: add `#![feature(const_try)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/consts/gate-do-not-const-check.stderr b/tests/ui/consts/gate-do-not-const-check.stderr
index 27a2c23a6788e..74ea71c4ed801 100644
--- a/tests/ui/consts/gate-do-not-const-check.stderr
+++ b/tests/ui/consts/gate-do-not-const-check.stderr
@@ -5,6 +5,7 @@ LL | #[rustc_do_not_const_check]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/consts/min_const_fn/address_of.stderr b/tests/ui/consts/min_const_fn/address_of.stderr
index facc566513c28..4c23ba6cd5190 100644
--- a/tests/ui/consts/min_const_fn/address_of.stderr
+++ b/tests/ui/consts/min_const_fn/address_of.stderr
@@ -6,6 +6,7 @@ LL |     let b = &raw mut a;
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: raw mutable references are not allowed in constant functions
   --> $DIR/address_of.rs:13:17
@@ -15,6 +16,7 @@ LL |         let b = &raw mut a;
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/consts/min_const_fn/min_const_fn.stderr b/tests/ui/consts/min_const_fn/min_const_fn.stderr
index 11c79e8e2d6a9..d646c7de8da7b 100644
--- a/tests/ui/consts/min_const_fn/min_const_fn.stderr
+++ b/tests/ui/consts/min_const_fn/min_const_fn.stderr
@@ -14,6 +14,7 @@ LL |     const fn get_mut(&mut self) -> &mut T { &mut self.0 }
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: mutable references are not allowed in constant functions
   --> $DIR/min_const_fn.rs:39:36
@@ -23,6 +24,7 @@ LL |     const fn get_mut(&mut self) -> &mut T { &mut self.0 }
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: mutable references are not allowed in constant functions
   --> $DIR/min_const_fn.rs:39:45
@@ -32,6 +34,7 @@ LL |     const fn get_mut(&mut self) -> &mut T { &mut self.0 }
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0493]: destructor of `Foo<T>` cannot be evaluated at compile-time
   --> $DIR/min_const_fn.rs:46:28
@@ -49,6 +52,7 @@ LL |     const fn get_mut_lt(&'a mut self) -> &mut T { &mut self.0 }
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: mutable references are not allowed in constant functions
   --> $DIR/min_const_fn.rs:48:42
@@ -58,6 +62,7 @@ LL |     const fn get_mut_lt(&'a mut self) -> &mut T { &mut self.0 }
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: mutable references are not allowed in constant functions
   --> $DIR/min_const_fn.rs:48:51
@@ -67,6 +72,7 @@ LL |     const fn get_mut_lt(&'a mut self) -> &mut T { &mut self.0 }
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0493]: destructor of `Foo<T>` cannot be evaluated at compile-time
   --> $DIR/min_const_fn.rs:55:27
@@ -84,6 +90,7 @@ LL |     const fn get_mut_s(&mut self) -> &mut T { &mut self.0 }
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: mutable references are not allowed in constant functions
   --> $DIR/min_const_fn.rs:57:38
@@ -93,6 +100,7 @@ LL |     const fn get_mut_s(&mut self) -> &mut T { &mut self.0 }
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: mutable references are not allowed in constant functions
   --> $DIR/min_const_fn.rs:57:47
@@ -102,6 +110,7 @@ LL |     const fn get_mut_s(&mut self) -> &mut T { &mut self.0 }
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: mutable references are not allowed in constant functions
   --> $DIR/min_const_fn.rs:64:25
@@ -111,6 +120,7 @@ LL |     const fn get_mut_sq(&mut self) -> &mut T { &mut self.0 }
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: mutable references are not allowed in constant functions
   --> $DIR/min_const_fn.rs:64:39
@@ -120,6 +130,7 @@ LL |     const fn get_mut_sq(&mut self) -> &mut T { &mut self.0 }
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: mutable references are not allowed in constant functions
   --> $DIR/min_const_fn.rs:64:48
@@ -129,6 +140,7 @@ LL |     const fn get_mut_sq(&mut self) -> &mut T { &mut self.0 }
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0013]: constant functions cannot refer to statics
   --> $DIR/min_const_fn.rs:89:27
@@ -190,6 +202,7 @@ LL | const fn inc(x: &mut i32) { *x += 1 }
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0493]: destructor of `AlanTuring<impl std::fmt::Debug>` cannot be evaluated at compile-time
   --> $DIR/min_const_fn.rs:122:19
diff --git a/tests/ui/consts/min_const_fn/min_const_fn_unsafe_bad.stderr b/tests/ui/consts/min_const_fn/min_const_fn_unsafe_bad.stderr
index e68376e7b87f9..13d733494d219 100644
--- a/tests/ui/consts/min_const_fn/min_const_fn_unsafe_bad.stderr
+++ b/tests/ui/consts/min_const_fn/min_const_fn_unsafe_bad.stderr
@@ -6,6 +6,7 @@ LL | const fn bad_const_fn_deref_raw(x: *mut usize) -> &'static usize { unsafe {
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: dereferencing raw mutable pointers in constant functions is unstable
   --> $DIR/min_const_fn_unsafe_bad.rs:4:70
@@ -15,6 +16,7 @@ LL | const unsafe fn bad_const_unsafe_deref_raw(x: *mut usize) -> usize { *x }
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: dereferencing raw mutable pointers in constant functions is unstable
   --> $DIR/min_const_fn_unsafe_bad.rs:7:83
@@ -24,6 +26,7 @@ LL | const unsafe fn bad_const_unsafe_deref_raw_ref(x: *mut usize) -> &'static u
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: dereferencing raw mutable pointers in constant functions is unstable
   --> $DIR/min_const_fn_unsafe_bad.rs:10:80
@@ -33,6 +36,7 @@ LL | const unsafe fn bad_const_unsafe_deref_raw_underscore(x: *mut usize) { let
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 4 previous errors
 
diff --git a/tests/ui/consts/min_const_fn/mutable_borrow.stderr b/tests/ui/consts/min_const_fn/mutable_borrow.stderr
index 8e95a4c68a2ad..31653602c75d2 100644
--- a/tests/ui/consts/min_const_fn/mutable_borrow.stderr
+++ b/tests/ui/consts/min_const_fn/mutable_borrow.stderr
@@ -6,6 +6,7 @@ LL |     let b = &mut a;
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: mutable references are not allowed in constant functions
   --> $DIR/mutable_borrow.rs:12:17
@@ -15,6 +16,7 @@ LL |         let b = &mut a;
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/consts/static_mut_containing_mut_ref2.stock.stderr b/tests/ui/consts/static_mut_containing_mut_ref2.stock.stderr
index c6e5b07e3b70a..e9fe82d2f87a6 100644
--- a/tests/ui/consts/static_mut_containing_mut_ref2.stock.stderr
+++ b/tests/ui/consts/static_mut_containing_mut_ref2.stock.stderr
@@ -21,6 +21,7 @@ LL |     *(&mut STDERR_BUFFER_SPACE) = 42;
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error; 1 warning emitted
 
diff --git a/tests/ui/consts/write_to_mut_ref_dest.stock.stderr b/tests/ui/consts/write_to_mut_ref_dest.stock.stderr
index bb10592760632..688d48ec707ca 100644
--- a/tests/ui/consts/write_to_mut_ref_dest.stock.stderr
+++ b/tests/ui/consts/write_to_mut_ref_dest.stock.stderr
@@ -6,6 +6,7 @@ LL |         let b: *mut u32 = &mut a;
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: dereferencing raw mutable pointers in constants is unstable
   --> $DIR/write_to_mut_ref_dest.rs:12:18
@@ -15,6 +16,7 @@ LL |         unsafe { *b = 5; }
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/coroutine/async_gen_fn.e2024.stderr b/tests/ui/coroutine/async_gen_fn.e2024.stderr
index d24cdbbc30d2f..37dc674a7e3a7 100644
--- a/tests/ui/coroutine/async_gen_fn.e2024.stderr
+++ b/tests/ui/coroutine/async_gen_fn.e2024.stderr
@@ -6,6 +6,7 @@ LL | async gen fn foo() {}
    |
    = note: see issue #117078 <https://github.com/rust-lang/rust/issues/117078> for more information
    = help: add `#![feature(gen_blocks)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/coroutine/gen_block.e2024.stderr b/tests/ui/coroutine/gen_block.e2024.stderr
index e32f80dafa0c1..2b9eb4a820b65 100644
--- a/tests/ui/coroutine/gen_block.e2024.stderr
+++ b/tests/ui/coroutine/gen_block.e2024.stderr
@@ -6,6 +6,7 @@ LL |     let _ = || yield true;
    |
    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
    = help: add `#![feature(coroutines)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0282]: type annotations needed
   --> $DIR/gen_block.rs:6:13
diff --git a/tests/ui/coroutine/gen_block.none.stderr b/tests/ui/coroutine/gen_block.none.stderr
index 012a8308c7f7a..78a8c5e798ad8 100644
--- a/tests/ui/coroutine/gen_block.none.stderr
+++ b/tests/ui/coroutine/gen_block.none.stderr
@@ -32,6 +32,7 @@ LL |     let _ = || yield true;
    |
    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
    = help: add `#![feature(coroutines)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: yield syntax is experimental
   --> $DIR/gen_block.rs:15:16
@@ -41,6 +42,7 @@ LL |     let _ = || yield true;
    |
    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
    = help: add `#![feature(coroutines)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error: aborting due to 6 previous errors
diff --git a/tests/ui/coroutine/gen_fn.e2024.stderr b/tests/ui/coroutine/gen_fn.e2024.stderr
index 9ad890af3e1e7..9c1843a0f5265 100644
--- a/tests/ui/coroutine/gen_fn.e2024.stderr
+++ b/tests/ui/coroutine/gen_fn.e2024.stderr
@@ -6,6 +6,7 @@ LL | gen fn foo() {}
    |
    = note: see issue #117078 <https://github.com/rust-lang/rust/issues/117078> for more information
    = help: add `#![feature(gen_blocks)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/diagnostic_namespace/feature-gate-diagnostic_namespace.stderr b/tests/ui/diagnostic_namespace/feature-gate-diagnostic_namespace.stderr
index 017d00e2c8e51..38424c13d8613 100644
--- a/tests/ui/diagnostic_namespace/feature-gate-diagnostic_namespace.stderr
+++ b/tests/ui/diagnostic_namespace/feature-gate-diagnostic_namespace.stderr
@@ -6,6 +6,7 @@ LL | #[diagnostic::non_existing_attribute]
    |
    = note: see issue #111996 <https://github.com/rust-lang/rust/issues/111996> for more information
    = help: add `#![feature(diagnostic_namespace)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `#[diagnostic]` attribute name space is experimental
   --> $DIR/feature-gate-diagnostic_namespace.rs:7:3
@@ -15,6 +16,7 @@ LL | #[diagnostic::non_existing_attribute(with_option = "foo")]
    |
    = note: see issue #111996 <https://github.com/rust-lang/rust/issues/111996> for more information
    = help: add `#![feature(diagnostic_namespace)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 warning: unknown diagnostic attribute
   --> $DIR/feature-gate-diagnostic_namespace.rs:1:15
diff --git a/tests/ui/diagnostic_namespace/on_unimplemented/feature-gate-diagnostic_on_unimplemented.stderr b/tests/ui/diagnostic_namespace/on_unimplemented/feature-gate-diagnostic_on_unimplemented.stderr
index 82e3b709f70d7..719322fa0f55e 100644
--- a/tests/ui/diagnostic_namespace/on_unimplemented/feature-gate-diagnostic_on_unimplemented.stderr
+++ b/tests/ui/diagnostic_namespace/on_unimplemented/feature-gate-diagnostic_on_unimplemented.stderr
@@ -6,6 +6,7 @@ LL | #[diagnostic::on_unimplemented(message = "Foo")]
    |
    = note: see issue #111996 <https://github.com/rust-lang/rust/issues/111996> for more information
    = help: add `#![feature(diagnostic_namespace)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/dyn-star/feature-gate-dyn_star.stderr b/tests/ui/dyn-star/feature-gate-dyn_star.stderr
index d8fe25b84bd3e..c3e99b20d06ab 100644
--- a/tests/ui/dyn-star/feature-gate-dyn_star.stderr
+++ b/tests/ui/dyn-star/feature-gate-dyn_star.stderr
@@ -6,6 +6,7 @@ LL | pub fn dyn_star_parameter(_: &dyn* Send) {
    |
    = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
    = help: add `#![feature(dyn_star)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/dyn-star/gated-span.stderr b/tests/ui/dyn-star/gated-span.stderr
index da5afa2d57840..8ba6d7969fc4f 100644
--- a/tests/ui/dyn-star/gated-span.stderr
+++ b/tests/ui/dyn-star/gated-span.stderr
@@ -6,6 +6,7 @@ LL | t!(dyn* Send);
    |
    = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
    = help: add `#![feature(dyn_star)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/dyn-star/no-explicit-dyn-star-cast.stderr b/tests/ui/dyn-star/no-explicit-dyn-star-cast.stderr
index 78af9c7a3895f..bb4c612cedd9b 100644
--- a/tests/ui/dyn-star/no-explicit-dyn-star-cast.stderr
+++ b/tests/ui/dyn-star/no-explicit-dyn-star-cast.stderr
@@ -6,6 +6,7 @@ LL |     let dyn_i: dyn* Debug = i as dyn* Debug;
    |
    = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
    = help: add `#![feature(dyn_star)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `dyn*` trait objects are experimental
   --> $DIR/no-explicit-dyn-star-cast.rs:5:34
@@ -15,6 +16,7 @@ LL |     let dyn_i: dyn* Debug = i as dyn* Debug;
    |
    = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
    = help: add `#![feature(dyn_star)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0606]: casting `usize` as `dyn* Debug` is invalid
   --> $DIR/no-explicit-dyn-star-cast.rs:5:29
diff --git a/tests/ui/error-codes/E0017.stderr b/tests/ui/error-codes/E0017.stderr
index ea6055da1c1fe..2a70f2ee0ae82 100644
--- a/tests/ui/error-codes/E0017.stderr
+++ b/tests/ui/error-codes/E0017.stderr
@@ -42,6 +42,7 @@ LL | static STATIC_REF: &'static mut i32 = &mut X;
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0764]: mutable references are not allowed in the final value of statics
   --> $DIR/E0017.rs:8:39
diff --git a/tests/ui/error-codes/E0388.stderr b/tests/ui/error-codes/E0388.stderr
index b51aa263d5e1c..1f7b688899ed0 100644
--- a/tests/ui/error-codes/E0388.stderr
+++ b/tests/ui/error-codes/E0388.stderr
@@ -27,6 +27,7 @@ LL | static STATIC_REF: &'static mut i32 = &mut X;
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0764]: mutable references are not allowed in the final value of statics
   --> $DIR/E0388.rs:6:39
diff --git a/tests/ui/error-codes/E0396.stderr b/tests/ui/error-codes/E0396.stderr
index a84a1216e0a9d..ac1e7d65ce841 100644
--- a/tests/ui/error-codes/E0396.stderr
+++ b/tests/ui/error-codes/E0396.stderr
@@ -6,6 +6,7 @@ LL | const VALUE: u8 = unsafe { *REG_ADDR };
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: dereferencing raw mutable pointers in constant functions is unstable
   --> $DIR/E0396.rs:10:11
@@ -15,6 +16,7 @@ LL |     match *INFALLIBLE {}
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: dereferencing raw mutable pointers in constant functions is unstable
   --> $DIR/E0396.rs:10:11
@@ -24,6 +26,7 @@ LL |     match *INFALLIBLE {}
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error[E0658]: dereferencing raw mutable pointers in constants is unstable
@@ -34,6 +37,7 @@ LL |     const BAD: () = unsafe { match *INFALLIBLE {} };
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: dereferencing raw mutable pointers in constants is unstable
   --> $DIR/E0396.rs:14:36
@@ -43,6 +47,7 @@ LL |     const BAD: () = unsafe { match *INFALLIBLE {} };
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error: aborting due to 5 previous errors
diff --git a/tests/ui/error-codes/E0658.stderr b/tests/ui/error-codes/E0658.stderr
index 686394b6d2259..e1e812940ec54 100644
--- a/tests/ui/error-codes/E0658.stderr
+++ b/tests/ui/error-codes/E0658.stderr
@@ -6,6 +6,7 @@ LL | enum Foo {
    |
    = note: see issue #56071 <https://github.com/rust-lang/rust/issues/56071> for more information
    = help: add `#![feature(repr128)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/explore-issue-38412.stderr b/tests/ui/explore-issue-38412.stderr
index d8b485c9dc344..a45ec6888559c 100644
--- a/tests/ui/explore-issue-38412.stderr
+++ b/tests/ui/explore-issue-38412.stderr
@@ -6,6 +6,7 @@ LL |     let Record { a_stable_pub: _, a_unstable_declared_pub: _, a_unstable_un
    |
    = note: see issue #38412 <https://github.com/rust-lang/rust/issues/38412> for more information
    = help: add `#![feature(unstable_undeclared)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_undeclared'
   --> $DIR/explore-issue-38412.rs:28:5
@@ -15,6 +16,7 @@ LL |     r.a_unstable_undeclared_pub;
    |
    = note: see issue #38412 <https://github.com/rust-lang/rust/issues/38412> for more information
    = help: add `#![feature(unstable_undeclared)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0616]: field `b_crate` of struct `Record` is private
   --> $DIR/explore-issue-38412.rs:29:7
@@ -42,6 +44,7 @@ LL |     t.2;
    |
    = note: see issue #38412 <https://github.com/rust-lang/rust/issues/38412> for more information
    = help: add `#![feature(unstable_undeclared)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0616]: field `3` of struct `pub_and_stability::Tuple` is private
   --> $DIR/explore-issue-38412.rs:36:7
@@ -69,6 +72,7 @@ LL |     r.unstable_undeclared_trait_method();
    |
    = note: see issue #38412 <https://github.com/rust-lang/rust/issues/38412> for more information
    = help: add `#![feature(unstable_undeclared)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_undeclared'
   --> $DIR/explore-issue-38412.rs:46:7
@@ -78,6 +82,7 @@ LL |     r.unstable_undeclared();
    |
    = note: see issue #38412 <https://github.com/rust-lang/rust/issues/38412> for more information
    = help: add `#![feature(unstable_undeclared)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0624]: method `pub_crate` is private
   --> $DIR/explore-issue-38412.rs:48:7
@@ -120,6 +125,7 @@ LL |     t.unstable_undeclared_trait_method();
    |
    = note: see issue #38412 <https://github.com/rust-lang/rust/issues/38412> for more information
    = help: add `#![feature(unstable_undeclared)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_undeclared'
   --> $DIR/explore-issue-38412.rs:59:7
@@ -129,6 +135,7 @@ LL |     t.unstable_undeclared();
    |
    = note: see issue #38412 <https://github.com/rust-lang/rust/issues/38412> for more information
    = help: add `#![feature(unstable_undeclared)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0624]: method `pub_crate` is private
   --> $DIR/explore-issue-38412.rs:61:7
diff --git a/tests/ui/expr/if/attrs/stmt-expr-gated.stderr b/tests/ui/expr/if/attrs/stmt-expr-gated.stderr
index afc26757c4615..b30de46411835 100644
--- a/tests/ui/expr/if/attrs/stmt-expr-gated.stderr
+++ b/tests/ui/expr/if/attrs/stmt-expr-gated.stderr
@@ -6,6 +6,7 @@ LL |     let _ = #[deny(warnings)] if true {
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/extern/issue-112363-extern-item-where-clauses-debug-ice.stderr b/tests/ui/extern/issue-112363-extern-item-where-clauses-debug-ice.stderr
index bdc6755038aa4..039e50b5e12da 100644
--- a/tests/ui/extern/issue-112363-extern-item-where-clauses-debug-ice.stderr
+++ b/tests/ui/extern/issue-112363-extern-item-where-clauses-debug-ice.stderr
@@ -40,6 +40,7 @@ LL |     type Item = [T] where [T]: Sized;
    |
    = note: see issue #43467 <https://github.com/rust-lang/rust/issues/43467> for more information
    = help: add `#![feature(extern_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 5 previous errors
 
diff --git a/tests/ui/feature-gates/doc-rust-logo.stderr b/tests/ui/feature-gates/doc-rust-logo.stderr
index 15398c8505f0f..5c64652667ed8 100644
--- a/tests/ui/feature-gates/doc-rust-logo.stderr
+++ b/tests/ui/feature-gates/doc-rust-logo.stderr
@@ -6,6 +6,7 @@ LL | #![doc(rust_logo)]
    |
    = note: see issue #90418 <https://github.com/rust-lang/rust/issues/90418> for more information
    = help: add `#![feature(rustdoc_internals)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-abi-avr-interrupt.stderr b/tests/ui/feature-gates/feature-gate-abi-avr-interrupt.stderr
index d017d03a3853a..c6786699de1b8 100644
--- a/tests/ui/feature-gates/feature-gate-abi-avr-interrupt.stderr
+++ b/tests/ui/feature-gates/feature-gate-abi-avr-interrupt.stderr
@@ -6,6 +6,7 @@ LL | extern "avr-non-blocking-interrupt" fn fu() {}
    |
    = note: see issue #69664 <https://github.com/rust-lang/rust/issues/69664> for more information
    = help: add `#![feature(abi_avr_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: avr-interrupt and avr-non-blocking-interrupt ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi-avr-interrupt.rs:13:8
@@ -15,6 +16,7 @@ LL | extern "avr-interrupt" fn f() {}
    |
    = note: see issue #69664 <https://github.com/rust-lang/rust/issues/69664> for more information
    = help: add `#![feature(abi_avr_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: avr-interrupt and avr-non-blocking-interrupt ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi-avr-interrupt.rs:17:12
@@ -24,6 +26,7 @@ LL |     extern "avr-interrupt" fn m();
    |
    = note: see issue #69664 <https://github.com/rust-lang/rust/issues/69664> for more information
    = help: add `#![feature(abi_avr_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: avr-interrupt and avr-non-blocking-interrupt ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi-avr-interrupt.rs:19:12
@@ -33,6 +36,7 @@ LL |     extern "avr-non-blocking-interrupt" fn mu();
    |
    = note: see issue #69664 <https://github.com/rust-lang/rust/issues/69664> for more information
    = help: add `#![feature(abi_avr_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: avr-interrupt and avr-non-blocking-interrupt ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi-avr-interrupt.rs:22:12
@@ -42,6 +46,7 @@ LL |     extern "avr-interrupt" fn dm() {}
    |
    = note: see issue #69664 <https://github.com/rust-lang/rust/issues/69664> for more information
    = help: add `#![feature(abi_avr_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: avr-interrupt and avr-non-blocking-interrupt ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi-avr-interrupt.rs:24:12
@@ -51,6 +56,7 @@ LL |     extern "avr-non-blocking-interrupt" fn dmu() {}
    |
    = note: see issue #69664 <https://github.com/rust-lang/rust/issues/69664> for more information
    = help: add `#![feature(abi_avr_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: avr-interrupt and avr-non-blocking-interrupt ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi-avr-interrupt.rs:30:12
@@ -60,6 +66,7 @@ LL |     extern "avr-interrupt" fn m() {}
    |
    = note: see issue #69664 <https://github.com/rust-lang/rust/issues/69664> for more information
    = help: add `#![feature(abi_avr_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: avr-interrupt and avr-non-blocking-interrupt ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi-avr-interrupt.rs:32:12
@@ -69,6 +76,7 @@ LL |     extern "avr-non-blocking-interrupt" fn mu() {}
    |
    = note: see issue #69664 <https://github.com/rust-lang/rust/issues/69664> for more information
    = help: add `#![feature(abi_avr_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: avr-interrupt and avr-non-blocking-interrupt ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi-avr-interrupt.rs:37:12
@@ -78,6 +86,7 @@ LL |     extern "avr-interrupt" fn im() {}
    |
    = note: see issue #69664 <https://github.com/rust-lang/rust/issues/69664> for more information
    = help: add `#![feature(abi_avr_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: avr-interrupt and avr-non-blocking-interrupt ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi-avr-interrupt.rs:39:12
@@ -87,6 +96,7 @@ LL |     extern "avr-non-blocking-interrupt" fn imu() {}
    |
    = note: see issue #69664 <https://github.com/rust-lang/rust/issues/69664> for more information
    = help: add `#![feature(abi_avr_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: avr-interrupt and avr-non-blocking-interrupt ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi-avr-interrupt.rs:43:18
@@ -96,6 +106,7 @@ LL | type TA = extern "avr-interrupt" fn();
    |
    = note: see issue #69664 <https://github.com/rust-lang/rust/issues/69664> for more information
    = help: add `#![feature(abi_avr_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: avr-interrupt and avr-non-blocking-interrupt ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi-avr-interrupt.rs:45:19
@@ -105,6 +116,7 @@ LL | type TAU = extern "avr-non-blocking-interrupt" fn();
    |
    = note: see issue #69664 <https://github.com/rust-lang/rust/issues/69664> for more information
    = help: add `#![feature(abi_avr_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: avr-interrupt and avr-non-blocking-interrupt ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi-avr-interrupt.rs:48:8
@@ -114,6 +126,7 @@ LL | extern "avr-interrupt" {}
    |
    = note: see issue #69664 <https://github.com/rust-lang/rust/issues/69664> for more information
    = help: add `#![feature(abi_avr_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: avr-interrupt and avr-non-blocking-interrupt ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi-avr-interrupt.rs:50:8
@@ -123,6 +136,7 @@ LL | extern "avr-non-blocking-interrupt" {}
    |
    = note: see issue #69664 <https://github.com/rust-lang/rust/issues/69664> for more information
    = help: add `#![feature(abi_avr_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 14 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-abi-msp430-interrupt.stderr b/tests/ui/feature-gates/feature-gate-abi-msp430-interrupt.stderr
index c19ec97896ba3..5dacc86dcc59c 100644
--- a/tests/ui/feature-gates/feature-gate-abi-msp430-interrupt.stderr
+++ b/tests/ui/feature-gates/feature-gate-abi-msp430-interrupt.stderr
@@ -6,6 +6,7 @@ LL | extern "msp430-interrupt" fn f() {}
    |
    = note: see issue #38487 <https://github.com/rust-lang/rust/issues/38487> for more information
    = help: add `#![feature(abi_msp430_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: msp430-interrupt ABI is experimental and subject to change
   --> $DIR/feature-gate-abi-msp430-interrupt.rs:12:12
@@ -15,6 +16,7 @@ LL |     extern "msp430-interrupt" fn m();
    |
    = note: see issue #38487 <https://github.com/rust-lang/rust/issues/38487> for more information
    = help: add `#![feature(abi_msp430_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: msp430-interrupt ABI is experimental and subject to change
   --> $DIR/feature-gate-abi-msp430-interrupt.rs:15:12
@@ -24,6 +26,7 @@ LL |     extern "msp430-interrupt" fn dm() {}
    |
    = note: see issue #38487 <https://github.com/rust-lang/rust/issues/38487> for more information
    = help: add `#![feature(abi_msp430_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: msp430-interrupt ABI is experimental and subject to change
   --> $DIR/feature-gate-abi-msp430-interrupt.rs:21:12
@@ -33,6 +36,7 @@ LL |     extern "msp430-interrupt" fn m() {}
    |
    = note: see issue #38487 <https://github.com/rust-lang/rust/issues/38487> for more information
    = help: add `#![feature(abi_msp430_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: msp430-interrupt ABI is experimental and subject to change
   --> $DIR/feature-gate-abi-msp430-interrupt.rs:26:12
@@ -42,6 +46,7 @@ LL |     extern "msp430-interrupt" fn im() {}
    |
    = note: see issue #38487 <https://github.com/rust-lang/rust/issues/38487> for more information
    = help: add `#![feature(abi_msp430_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: msp430-interrupt ABI is experimental and subject to change
   --> $DIR/feature-gate-abi-msp430-interrupt.rs:30:18
@@ -51,6 +56,7 @@ LL | type TA = extern "msp430-interrupt" fn();
    |
    = note: see issue #38487 <https://github.com/rust-lang/rust/issues/38487> for more information
    = help: add `#![feature(abi_msp430_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: msp430-interrupt ABI is experimental and subject to change
   --> $DIR/feature-gate-abi-msp430-interrupt.rs:33:8
@@ -60,6 +66,7 @@ LL | extern "msp430-interrupt" {}
    |
    = note: see issue #38487 <https://github.com/rust-lang/rust/issues/38487> for more information
    = help: add `#![feature(abi_msp430_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 7 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-abi-riscv-interrupt.stderr b/tests/ui/feature-gates/feature-gate-abi-riscv-interrupt.stderr
index 60c7fa0ea67b8..6b7853a320b0d 100644
--- a/tests/ui/feature-gates/feature-gate-abi-riscv-interrupt.stderr
+++ b/tests/ui/feature-gates/feature-gate-abi-riscv-interrupt.stderr
@@ -6,6 +6,7 @@ LL | extern "riscv-interrupt-m" fn f() {}
    |
    = note: see issue #111889 <https://github.com/rust-lang/rust/issues/111889> for more information
    = help: add `#![feature(abi_riscv_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: riscv-interrupt ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi-riscv-interrupt.rs:13:8
@@ -15,6 +16,7 @@ LL | extern "riscv-interrupt-s" fn f_s() {}
    |
    = note: see issue #111889 <https://github.com/rust-lang/rust/issues/111889> for more information
    = help: add `#![feature(abi_riscv_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: riscv-interrupt ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi-riscv-interrupt.rs:17:12
@@ -24,6 +26,7 @@ LL |     extern "riscv-interrupt-m" fn m();
    |
    = note: see issue #111889 <https://github.com/rust-lang/rust/issues/111889> for more information
    = help: add `#![feature(abi_riscv_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: riscv-interrupt ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi-riscv-interrupt.rs:23:12
@@ -33,6 +36,7 @@ LL |     extern "riscv-interrupt-m" fn m() {}
    |
    = note: see issue #111889 <https://github.com/rust-lang/rust/issues/111889> for more information
    = help: add `#![feature(abi_riscv_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: riscv-interrupt ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi-riscv-interrupt.rs:28:12
@@ -42,6 +46,7 @@ LL |     extern "riscv-interrupt-m" fn im() {}
    |
    = note: see issue #111889 <https://github.com/rust-lang/rust/issues/111889> for more information
    = help: add `#![feature(abi_riscv_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: riscv-interrupt ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi-riscv-interrupt.rs:32:18
@@ -51,6 +56,7 @@ LL | type TA = extern "riscv-interrupt-m" fn();
    |
    = note: see issue #111889 <https://github.com/rust-lang/rust/issues/111889> for more information
    = help: add `#![feature(abi_riscv_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 6 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-abi-x86-interrupt.stderr b/tests/ui/feature-gates/feature-gate-abi-x86-interrupt.stderr
index 3b727a745e8ff..860005cac3416 100644
--- a/tests/ui/feature-gates/feature-gate-abi-x86-interrupt.stderr
+++ b/tests/ui/feature-gates/feature-gate-abi-x86-interrupt.stderr
@@ -6,6 +6,7 @@ LL | extern "x86-interrupt" fn f7() {}
    |
    = note: see issue #40180 <https://github.com/rust-lang/rust/issues/40180> for more information
    = help: add `#![feature(abi_x86_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: x86-interrupt ABI is experimental and subject to change
   --> $DIR/feature-gate-abi-x86-interrupt.rs:10:12
@@ -15,6 +16,7 @@ LL |     extern "x86-interrupt" fn m7();
    |
    = note: see issue #40180 <https://github.com/rust-lang/rust/issues/40180> for more information
    = help: add `#![feature(abi_x86_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: x86-interrupt ABI is experimental and subject to change
   --> $DIR/feature-gate-abi-x86-interrupt.rs:11:12
@@ -24,6 +26,7 @@ LL |     extern "x86-interrupt" fn dm7() {}
    |
    = note: see issue #40180 <https://github.com/rust-lang/rust/issues/40180> for more information
    = help: add `#![feature(abi_x86_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: x86-interrupt ABI is experimental and subject to change
   --> $DIR/feature-gate-abi-x86-interrupt.rs:18:12
@@ -33,6 +36,7 @@ LL |     extern "x86-interrupt" fn m7() {}
    |
    = note: see issue #40180 <https://github.com/rust-lang/rust/issues/40180> for more information
    = help: add `#![feature(abi_x86_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: x86-interrupt ABI is experimental and subject to change
   --> $DIR/feature-gate-abi-x86-interrupt.rs:23:12
@@ -42,6 +46,7 @@ LL |     extern "x86-interrupt" fn im7() {}
    |
    = note: see issue #40180 <https://github.com/rust-lang/rust/issues/40180> for more information
    = help: add `#![feature(abi_x86_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: x86-interrupt ABI is experimental and subject to change
   --> $DIR/feature-gate-abi-x86-interrupt.rs:26:18
@@ -51,6 +56,7 @@ LL | type A7 = extern "x86-interrupt" fn();
    |
    = note: see issue #40180 <https://github.com/rust-lang/rust/issues/40180> for more information
    = help: add `#![feature(abi_x86_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: x86-interrupt ABI is experimental and subject to change
   --> $DIR/feature-gate-abi-x86-interrupt.rs:28:8
@@ -60,6 +66,7 @@ LL | extern "x86-interrupt" {}
    |
    = note: see issue #40180 <https://github.com/rust-lang/rust/issues/40180> for more information
    = help: add `#![feature(abi_x86_interrupt)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 7 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-abi.stderr b/tests/ui/feature-gates/feature-gate-abi.stderr
index e9791b9513f4d..d031c2adf50cc 100644
--- a/tests/ui/feature-gates/feature-gate-abi.stderr
+++ b/tests/ui/feature-gates/feature-gate-abi.stderr
@@ -5,6 +5,7 @@ LL | extern "rust-intrinsic" fn f1() {}
    |        ^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: platform intrinsics are experimental and possibly buggy
   --> $DIR/feature-gate-abi.rs:17:8
@@ -14,6 +15,7 @@ LL | extern "platform-intrinsic" fn f2() {}
    |
    = note: see issue #27731 <https://github.com/rust-lang/rust/issues/27731> for more information
    = help: add `#![feature(platform_intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: rust-call ABI is subject to change
   --> $DIR/feature-gate-abi.rs:19:8
@@ -23,6 +25,7 @@ LL | extern "rust-call" fn f4(_: ()) {}
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: intrinsics are subject to change
   --> $DIR/feature-gate-abi.rs:23:12
@@ -31,6 +34,7 @@ LL |     extern "rust-intrinsic" fn m1();
    |            ^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: platform intrinsics are experimental and possibly buggy
   --> $DIR/feature-gate-abi.rs:25:12
@@ -40,6 +44,7 @@ LL |     extern "platform-intrinsic" fn m2();
    |
    = note: see issue #27731 <https://github.com/rust-lang/rust/issues/27731> for more information
    = help: add `#![feature(platform_intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: rust-call ABI is subject to change
   --> $DIR/feature-gate-abi.rs:27:12
@@ -49,6 +54,7 @@ LL |     extern "rust-call" fn m4(_: ());
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: rust-call ABI is subject to change
   --> $DIR/feature-gate-abi.rs:29:12
@@ -58,6 +64,7 @@ LL |     extern "rust-call" fn dm4(_: ()) {}
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: intrinsics are subject to change
   --> $DIR/feature-gate-abi.rs:36:12
@@ -66,6 +73,7 @@ LL |     extern "rust-intrinsic" fn m1() {}
    |            ^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: platform intrinsics are experimental and possibly buggy
   --> $DIR/feature-gate-abi.rs:38:12
@@ -75,6 +83,7 @@ LL |     extern "platform-intrinsic" fn m2() {}
    |
    = note: see issue #27731 <https://github.com/rust-lang/rust/issues/27731> for more information
    = help: add `#![feature(platform_intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: rust-call ABI is subject to change
   --> $DIR/feature-gate-abi.rs:40:12
@@ -84,6 +93,7 @@ LL |     extern "rust-call" fn m4(_: ()) {}
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: intrinsics are subject to change
   --> $DIR/feature-gate-abi.rs:45:12
@@ -92,6 +102,7 @@ LL |     extern "rust-intrinsic" fn im1() {}
    |            ^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: platform intrinsics are experimental and possibly buggy
   --> $DIR/feature-gate-abi.rs:47:12
@@ -101,6 +112,7 @@ LL |     extern "platform-intrinsic" fn im2() {}
    |
    = note: see issue #27731 <https://github.com/rust-lang/rust/issues/27731> for more information
    = help: add `#![feature(platform_intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: rust-call ABI is subject to change
   --> $DIR/feature-gate-abi.rs:49:12
@@ -110,6 +122,7 @@ LL |     extern "rust-call" fn im4(_: ()) {}
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: intrinsics are subject to change
   --> $DIR/feature-gate-abi.rs:53:18
@@ -118,6 +131,7 @@ LL | type A1 = extern "rust-intrinsic" fn();
    |                  ^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: platform intrinsics are experimental and possibly buggy
   --> $DIR/feature-gate-abi.rs:54:18
@@ -127,6 +141,7 @@ LL | type A2 = extern "platform-intrinsic" fn();
    |
    = note: see issue #27731 <https://github.com/rust-lang/rust/issues/27731> for more information
    = help: add `#![feature(platform_intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: rust-call ABI is subject to change
   --> $DIR/feature-gate-abi.rs:55:18
@@ -136,6 +151,7 @@ LL | type A4 = extern "rust-call" fn(_: ());
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: intrinsics are subject to change
   --> $DIR/feature-gate-abi.rs:58:8
@@ -144,6 +160,7 @@ LL | extern "rust-intrinsic" {}
    |        ^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: platform intrinsics are experimental and possibly buggy
   --> $DIR/feature-gate-abi.rs:59:8
@@ -153,6 +170,7 @@ LL | extern "platform-intrinsic" {}
    |
    = note: see issue #27731 <https://github.com/rust-lang/rust/issues/27731> for more information
    = help: add `#![feature(platform_intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: rust-call ABI is subject to change
   --> $DIR/feature-gate-abi.rs:60:8
@@ -162,6 +180,7 @@ LL | extern "rust-call" {}
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: intrinsic must be in `extern "rust-intrinsic" { ... }` block
   --> $DIR/feature-gate-abi.rs:23:32
diff --git a/tests/ui/feature-gates/feature-gate-abi_amdgpu_kernel.stderr b/tests/ui/feature-gates/feature-gate-abi_amdgpu_kernel.stderr
index c89ab7bae1169..c5ae52c789b67 100644
--- a/tests/ui/feature-gates/feature-gate-abi_amdgpu_kernel.stderr
+++ b/tests/ui/feature-gates/feature-gate-abi_amdgpu_kernel.stderr
@@ -6,6 +6,7 @@ LL | extern "amdgpu-kernel" fn fu() {}
    |
    = note: see issue #51575 <https://github.com/rust-lang/rust/issues/51575> for more information
    = help: add `#![feature(abi_amdgpu_kernel)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: amdgpu-kernel ABI is experimental and subject to change
   --> $DIR/feature-gate-abi_amdgpu_kernel.rs:11:12
@@ -15,6 +16,7 @@ LL |     extern "amdgpu-kernel" fn mu();
    |
    = note: see issue #51575 <https://github.com/rust-lang/rust/issues/51575> for more information
    = help: add `#![feature(abi_amdgpu_kernel)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: amdgpu-kernel ABI is experimental and subject to change
   --> $DIR/feature-gate-abi_amdgpu_kernel.rs:12:12
@@ -24,6 +26,7 @@ LL |     extern "amdgpu-kernel" fn dmu() {}
    |
    = note: see issue #51575 <https://github.com/rust-lang/rust/issues/51575> for more information
    = help: add `#![feature(abi_amdgpu_kernel)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: amdgpu-kernel ABI is experimental and subject to change
   --> $DIR/feature-gate-abi_amdgpu_kernel.rs:18:12
@@ -33,6 +36,7 @@ LL |     extern "amdgpu-kernel" fn mu() {}
    |
    = note: see issue #51575 <https://github.com/rust-lang/rust/issues/51575> for more information
    = help: add `#![feature(abi_amdgpu_kernel)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: amdgpu-kernel ABI is experimental and subject to change
   --> $DIR/feature-gate-abi_amdgpu_kernel.rs:23:12
@@ -42,6 +46,7 @@ LL |     extern "amdgpu-kernel" fn imu() {}
    |
    = note: see issue #51575 <https://github.com/rust-lang/rust/issues/51575> for more information
    = help: add `#![feature(abi_amdgpu_kernel)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: amdgpu-kernel ABI is experimental and subject to change
   --> $DIR/feature-gate-abi_amdgpu_kernel.rs:27:19
@@ -51,6 +56,7 @@ LL | type TAU = extern "amdgpu-kernel" fn();
    |
    = note: see issue #51575 <https://github.com/rust-lang/rust/issues/51575> for more information
    = help: add `#![feature(abi_amdgpu_kernel)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: amdgpu-kernel ABI is experimental and subject to change
   --> $DIR/feature-gate-abi_amdgpu_kernel.rs:29:8
@@ -60,6 +66,7 @@ LL | extern "amdgpu-kernel" {}
    |
    = note: see issue #51575 <https://github.com/rust-lang/rust/issues/51575> for more information
    = help: add `#![feature(abi_amdgpu_kernel)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0570]: `"amdgpu-kernel"` is not a supported ABI for the current target
   --> $DIR/feature-gate-abi_amdgpu_kernel.rs:29:1
diff --git a/tests/ui/feature-gates/feature-gate-abi_ptx.stderr b/tests/ui/feature-gates/feature-gate-abi_ptx.stderr
index 40782d361ee33..22b493e577dd5 100644
--- a/tests/ui/feature-gates/feature-gate-abi_ptx.stderr
+++ b/tests/ui/feature-gates/feature-gate-abi_ptx.stderr
@@ -6,6 +6,7 @@ LL | extern "ptx-kernel" fn fu() {}
    |
    = note: see issue #38788 <https://github.com/rust-lang/rust/issues/38788> for more information
    = help: add `#![feature(abi_ptx)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: PTX ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi_ptx.rs:11:12
@@ -15,6 +16,7 @@ LL |     extern "ptx-kernel" fn mu();
    |
    = note: see issue #38788 <https://github.com/rust-lang/rust/issues/38788> for more information
    = help: add `#![feature(abi_ptx)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: PTX ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi_ptx.rs:12:12
@@ -24,6 +26,7 @@ LL |     extern "ptx-kernel" fn dmu() {}
    |
    = note: see issue #38788 <https://github.com/rust-lang/rust/issues/38788> for more information
    = help: add `#![feature(abi_ptx)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: PTX ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi_ptx.rs:17:12
@@ -33,6 +36,7 @@ LL |     extern "ptx-kernel" fn mu() {}
    |
    = note: see issue #38788 <https://github.com/rust-lang/rust/issues/38788> for more information
    = help: add `#![feature(abi_ptx)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: PTX ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi_ptx.rs:21:12
@@ -42,6 +46,7 @@ LL |     extern "ptx-kernel" fn imu() {}
    |
    = note: see issue #38788 <https://github.com/rust-lang/rust/issues/38788> for more information
    = help: add `#![feature(abi_ptx)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: PTX ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi_ptx.rs:24:19
@@ -51,6 +56,7 @@ LL | type TAU = extern "ptx-kernel" fn();
    |
    = note: see issue #38788 <https://github.com/rust-lang/rust/issues/38788> for more information
    = help: add `#![feature(abi_ptx)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: PTX ABIs are experimental and subject to change
   --> $DIR/feature-gate-abi_ptx.rs:26:8
@@ -60,6 +66,7 @@ LL | extern "ptx-kernel" {}
    |
    = note: see issue #38788 <https://github.com/rust-lang/rust/issues/38788> for more information
    = help: add `#![feature(abi_ptx)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 7 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-abi_unadjusted.stderr b/tests/ui/feature-gates/feature-gate-abi_unadjusted.stderr
index 3cc7b100db2f9..1d5fb11cd3d2b 100644
--- a/tests/ui/feature-gates/feature-gate-abi_unadjusted.stderr
+++ b/tests/ui/feature-gates/feature-gate-abi_unadjusted.stderr
@@ -5,6 +5,7 @@ LL | extern "unadjusted" fn foo() {
    |        ^^^^^^^^^^^^
    |
    = help: add `#![feature(abi_unadjusted)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-alloc-error-handler.stderr b/tests/ui/feature-gates/feature-gate-alloc-error-handler.stderr
index 1f22c8c585130..2ebd7cd9b0239 100644
--- a/tests/ui/feature-gates/feature-gate-alloc-error-handler.stderr
+++ b/tests/ui/feature-gates/feature-gate-alloc-error-handler.stderr
@@ -6,6 +6,7 @@ LL | #[alloc_error_handler]
    |
    = note: see issue #51540 <https://github.com/rust-lang/rust/issues/51540> for more information
    = help: add `#![feature(alloc_error_handler)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-allocator_internals.stderr b/tests/ui/feature-gates/feature-gate-allocator_internals.stderr
index 66a1c1be3f4e8..905c0252484bf 100644
--- a/tests/ui/feature-gates/feature-gate-allocator_internals.stderr
+++ b/tests/ui/feature-gates/feature-gate-allocator_internals.stderr
@@ -5,6 +5,7 @@ LL | #![default_lib_allocator]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(allocator_internals)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-allow-internal-unsafe-nested-macro.stderr b/tests/ui/feature-gates/feature-gate-allow-internal-unsafe-nested-macro.stderr
index c2d29db686695..7a0dcb0843590 100644
--- a/tests/ui/feature-gates/feature-gate-allow-internal-unsafe-nested-macro.stderr
+++ b/tests/ui/feature-gates/feature-gate-allow-internal-unsafe-nested-macro.stderr
@@ -8,6 +8,7 @@ LL | bar!();
    | ------ in this macro invocation
    |
    = help: add `#![feature(allow_internal_unsafe)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the macro `bar` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 1 previous error
diff --git a/tests/ui/feature-gates/feature-gate-allow-internal-unstable-nested-macro.stderr b/tests/ui/feature-gates/feature-gate-allow-internal-unstable-nested-macro.stderr
index c0ab67025b265..4aacfebd6b1fa 100644
--- a/tests/ui/feature-gates/feature-gate-allow-internal-unstable-nested-macro.stderr
+++ b/tests/ui/feature-gates/feature-gate-allow-internal-unstable-nested-macro.stderr
@@ -8,6 +8,7 @@ LL | bar!();
    | ------ in this macro invocation
    |
    = help: add `#![feature(allow_internal_unstable)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the macro `bar` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 1 previous error
diff --git a/tests/ui/feature-gates/feature-gate-allow-internal-unstable-struct.stderr b/tests/ui/feature-gates/feature-gate-allow-internal-unstable-struct.stderr
index df7773ba4fb65..28f1a0d6ed5ab 100644
--- a/tests/ui/feature-gates/feature-gate-allow-internal-unstable-struct.stderr
+++ b/tests/ui/feature-gates/feature-gate-allow-internal-unstable-struct.stderr
@@ -5,6 +5,7 @@ LL | #[allow_internal_unstable()]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(allow_internal_unstable)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: attribute should be applied to a macro
   --> $DIR/feature-gate-allow-internal-unstable-struct.rs:4:1
diff --git a/tests/ui/feature-gates/feature-gate-allow-internal-unstable.stderr b/tests/ui/feature-gates/feature-gate-allow-internal-unstable.stderr
index cb6cf4699fd81..3e3ecc1e5bab1 100644
--- a/tests/ui/feature-gates/feature-gate-allow-internal-unstable.stderr
+++ b/tests/ui/feature-gates/feature-gate-allow-internal-unstable.stderr
@@ -5,6 +5,7 @@ LL | #[allow_internal_unstable()]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(allow_internal_unstable)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-arbitrary-self-types.stderr b/tests/ui/feature-gates/feature-gate-arbitrary-self-types.stderr
index a1c69a5afb611..7f0e02c91f8f8 100644
--- a/tests/ui/feature-gates/feature-gate-arbitrary-self-types.stderr
+++ b/tests/ui/feature-gates/feature-gate-arbitrary-self-types.stderr
@@ -6,6 +6,7 @@ LL |     fn foo(self: Ptr<Self>) {}
    |
    = note: see issue #44874 <https://github.com/rust-lang/rust/issues/44874> for more information
    = help: add `#![feature(arbitrary_self_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: consider changing to `self`, `&self`, `&mut self`, `self: Box<Self>`, `self: Rc<Self>`, `self: Arc<Self>`, or `self: Pin<P>` (where P is one of the previous types except `Self`)
 
 error[E0658]: `Box<Ptr<Bar>>` cannot be used as the type of `self` without the `arbitrary_self_types` feature
@@ -16,6 +17,7 @@ LL |     fn bar(self: Box<Ptr<Self>>) {}
    |
    = note: see issue #44874 <https://github.com/rust-lang/rust/issues/44874> for more information
    = help: add `#![feature(arbitrary_self_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: consider changing to `self`, `&self`, `&mut self`, `self: Box<Self>`, `self: Rc<Self>`, `self: Arc<Self>`, or `self: Pin<P>` (where P is one of the previous types except `Self`)
 
 error[E0658]: `Ptr<Self>` cannot be used as the type of `self` without the `arbitrary_self_types` feature
@@ -26,6 +28,7 @@ LL |     fn foo(self: Ptr<Self>);
    |
    = note: see issue #44874 <https://github.com/rust-lang/rust/issues/44874> for more information
    = help: add `#![feature(arbitrary_self_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: consider changing to `self`, `&self`, `&mut self`, `self: Box<Self>`, `self: Rc<Self>`, `self: Arc<Self>`, or `self: Pin<P>` (where P is one of the previous types except `Self`)
 
 error: aborting due to 3 previous errors
diff --git a/tests/ui/feature-gates/feature-gate-arbitrary_self_types-raw-pointer.stderr b/tests/ui/feature-gates/feature-gate-arbitrary_self_types-raw-pointer.stderr
index a9f611b874527..711025ff93b44 100644
--- a/tests/ui/feature-gates/feature-gate-arbitrary_self_types-raw-pointer.stderr
+++ b/tests/ui/feature-gates/feature-gate-arbitrary_self_types-raw-pointer.stderr
@@ -6,6 +6,7 @@ LL |     fn foo(self: *const Self) {}
    |
    = note: see issue #44874 <https://github.com/rust-lang/rust/issues/44874> for more information
    = help: add `#![feature(arbitrary_self_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: consider changing to `self`, `&self`, `&mut self`, `self: Box<Self>`, `self: Rc<Self>`, `self: Arc<Self>`, or `self: Pin<P>` (where P is one of the previous types except `Self`)
 
 error[E0658]: `*const ()` cannot be used as the type of `self` without the `arbitrary_self_types` feature
@@ -16,6 +17,7 @@ LL |     fn bar(self: *const Self) {}
    |
    = note: see issue #44874 <https://github.com/rust-lang/rust/issues/44874> for more information
    = help: add `#![feature(arbitrary_self_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: consider changing to `self`, `&self`, `&mut self`, `self: Box<Self>`, `self: Rc<Self>`, `self: Arc<Self>`, or `self: Pin<P>` (where P is one of the previous types except `Self`)
 
 error[E0658]: `*const Self` cannot be used as the type of `self` without the `arbitrary_self_types` feature
@@ -26,6 +28,7 @@ LL |     fn bar(self: *const Self);
    |
    = note: see issue #44874 <https://github.com/rust-lang/rust/issues/44874> for more information
    = help: add `#![feature(arbitrary_self_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: consider changing to `self`, `&self`, `&mut self`, `self: Box<Self>`, `self: Rc<Self>`, `self: Arc<Self>`, or `self: Pin<P>` (where P is one of the previous types except `Self`)
 
 error: aborting due to 3 previous errors
diff --git a/tests/ui/feature-gates/feature-gate-asm_const.stderr b/tests/ui/feature-gates/feature-gate-asm_const.stderr
index c248374ec4924..4f83fee675933 100644
--- a/tests/ui/feature-gates/feature-gate-asm_const.stderr
+++ b/tests/ui/feature-gates/feature-gate-asm_const.stderr
@@ -6,6 +6,7 @@ LL |     asm!("mov eax, {}", const N + 1);
    |
    = note: see issue #93332 <https://github.com/rust-lang/rust/issues/93332> for more information
    = help: add `#![feature(asm_const)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: const operands for inline assembly are unstable
   --> $DIR/feature-gate-asm_const.rs:13:29
@@ -15,6 +16,7 @@ LL |         asm!("mov eax, {}", const 123);
    |
    = note: see issue #93332 <https://github.com/rust-lang/rust/issues/93332> for more information
    = help: add `#![feature(asm_const)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-asm_experimental_arch.stderr b/tests/ui/feature-gates/feature-gate-asm_experimental_arch.stderr
index 9db088475a16c..d930429779c01 100644
--- a/tests/ui/feature-gates/feature-gate-asm_experimental_arch.stderr
+++ b/tests/ui/feature-gates/feature-gate-asm_experimental_arch.stderr
@@ -6,6 +6,7 @@ LL |     asm!("");
    |
    = note: see issue #93335 <https://github.com/rust-lang/rust/issues/93335> for more information
    = help: add `#![feature(asm_experimental_arch)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-asm_unwind.stderr b/tests/ui/feature-gates/feature-gate-asm_unwind.stderr
index eeabf7a5b0c8e..bae263ee3a073 100644
--- a/tests/ui/feature-gates/feature-gate-asm_unwind.stderr
+++ b/tests/ui/feature-gates/feature-gate-asm_unwind.stderr
@@ -6,6 +6,7 @@ LL |         asm!("", options(may_unwind));
    |
    = note: see issue #93334 <https://github.com/rust-lang/rust/issues/93334> for more information
    = help: add `#![feature(asm_unwind)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-assoc-type-defaults.stderr b/tests/ui/feature-gates/feature-gate-assoc-type-defaults.stderr
index 2ebaf40dcf6e0..d7f4e6da7826c 100644
--- a/tests/ui/feature-gates/feature-gate-assoc-type-defaults.stderr
+++ b/tests/ui/feature-gates/feature-gate-assoc-type-defaults.stderr
@@ -6,6 +6,7 @@ LL |     type Bar = u8;
    |
    = note: see issue #29661 <https://github.com/rust-lang/rust/issues/29661> for more information
    = help: add `#![feature(associated_type_defaults)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-associated_const_equality.stderr b/tests/ui/feature-gates/feature-gate-associated_const_equality.stderr
index a5f92b44c41d1..5a0fb69b6ba7e 100644
--- a/tests/ui/feature-gates/feature-gate-associated_const_equality.stderr
+++ b/tests/ui/feature-gates/feature-gate-associated_const_equality.stderr
@@ -6,6 +6,7 @@ LL | fn foo<A: TraitWAssocConst<A=32>>() {}
    |
    = note: see issue #92827 <https://github.com/rust-lang/rust/issues/92827> for more information
    = help: add `#![feature(associated_const_equality)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-associated_type_bounds.stderr b/tests/ui/feature-gates/feature-gate-associated_type_bounds.stderr
index 4a643d31259f2..efab91f25f0d2 100644
--- a/tests/ui/feature-gates/feature-gate-associated_type_bounds.stderr
+++ b/tests/ui/feature-gates/feature-gate-associated_type_bounds.stderr
@@ -6,6 +6,7 @@ LL |     type A: Iterator<Item: Copy>;
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: associated type bounds are unstable
   --> $DIR/feature-gate-associated_type_bounds.rs:16:22
@@ -15,6 +16,7 @@ LL |     type B: Iterator<Item: 'static>;
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: associated type bounds are unstable
   --> $DIR/feature-gate-associated_type_bounds.rs:20:20
@@ -24,6 +26,7 @@ LL | struct _St1<T: Tr1<As1: Tr2>> {
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: associated type bounds are unstable
   --> $DIR/feature-gate-associated_type_bounds.rs:27:18
@@ -33,6 +36,7 @@ LL | enum _En1<T: Tr1<As1: Tr2>> {
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: associated type bounds are unstable
   --> $DIR/feature-gate-associated_type_bounds.rs:34:19
@@ -42,6 +46,7 @@ LL | union _Un1<T: Tr1<As1: Tr2>> {
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: associated type bounds are unstable
   --> $DIR/feature-gate-associated_type_bounds.rs:41:37
@@ -51,6 +56,7 @@ LL | type _TaWhere1<T> where T: Iterator<Item: Copy> = T;
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: associated type bounds are unstable
   --> $DIR/feature-gate-associated_type_bounds.rs:44:22
@@ -60,6 +66,7 @@ LL | fn _apit(_: impl Tr1<As1: Copy>) {}
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: associated type bounds are unstable
   --> $DIR/feature-gate-associated_type_bounds.rs:46:26
@@ -69,6 +76,7 @@ LL | fn _apit_dyn(_: &dyn Tr1<As1: Copy>) {}
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: associated type bounds are unstable
   --> $DIR/feature-gate-associated_type_bounds.rs:49:24
@@ -78,6 +86,7 @@ LL | fn _rpit() -> impl Tr1<As1: Copy> { S1 }
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: associated type bounds are unstable
   --> $DIR/feature-gate-associated_type_bounds.rs:52:31
@@ -87,6 +96,7 @@ LL | fn _rpit_dyn() -> Box<dyn Tr1<As1: Copy>> { Box::new(S1) }
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: associated type bounds are unstable
   --> $DIR/feature-gate-associated_type_bounds.rs:55:23
@@ -96,6 +106,7 @@ LL | const _cdef: impl Tr1<As1: Copy> = S1;
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: associated type bounds are unstable
   --> $DIR/feature-gate-associated_type_bounds.rs:61:24
@@ -105,6 +116,7 @@ LL | static _sdef: impl Tr1<As1: Copy> = S1;
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: associated type bounds are unstable
   --> $DIR/feature-gate-associated_type_bounds.rs:68:21
@@ -114,6 +126,7 @@ LL |     let _: impl Tr1<As1: Copy> = S1;
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0562]: `impl Trait` is not allowed in const types
   --> $DIR/feature-gate-associated_type_bounds.rs:55:14
diff --git a/tests/ui/feature-gates/feature-gate-auto-traits.stderr b/tests/ui/feature-gates/feature-gate-auto-traits.stderr
index e015418161e5a..139229ca809b2 100644
--- a/tests/ui/feature-gates/feature-gate-auto-traits.stderr
+++ b/tests/ui/feature-gates/feature-gate-auto-traits.stderr
@@ -6,6 +6,7 @@ LL | auto trait AutoDummyTrait {}
    |
    = note: see issue #13231 <https://github.com/rust-lang/rust/issues/13231> for more information
    = help: add `#![feature(auto_traits)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now
   --> $DIR/feature-gate-auto-traits.rs:9:6
@@ -15,6 +16,7 @@ LL | impl !AutoDummyTrait for DummyStruct {}
    |
    = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
    = help: add `#![feature(negative_impls)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-box_patterns.stderr b/tests/ui/feature-gates/feature-gate-box_patterns.stderr
index da15f698b75cb..fb61b2b1810a3 100644
--- a/tests/ui/feature-gates/feature-gate-box_patterns.stderr
+++ b/tests/ui/feature-gates/feature-gate-box_patterns.stderr
@@ -6,6 +6,7 @@ LL |     let box x = Box::new('c');
    |
    = note: see issue #29641 <https://github.com/rust-lang/rust/issues/29641> for more information
    = help: add `#![feature(box_patterns)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-builtin_syntax.stderr b/tests/ui/feature-gates/feature-gate-builtin_syntax.stderr
index 6601d4cb417a0..297363b3de711 100644
--- a/tests/ui/feature-gates/feature-gate-builtin_syntax.stderr
+++ b/tests/ui/feature-gates/feature-gate-builtin_syntax.stderr
@@ -6,6 +6,7 @@ LL |     builtin # offset_of(Foo, v);
    |
    = note: see issue #110680 <https://github.com/rust-lang/rust/issues/110680> for more information
    = help: add `#![feature(builtin_syntax)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-c_variadic.stderr b/tests/ui/feature-gates/feature-gate-c_variadic.stderr
index a439f297ba334..1b6a8c92af5ed 100644
--- a/tests/ui/feature-gates/feature-gate-c_variadic.stderr
+++ b/tests/ui/feature-gates/feature-gate-c_variadic.stderr
@@ -6,6 +6,7 @@ LL | pub unsafe extern "C" fn test(_: i32, ap: ...) { }
    |
    = note: see issue #44930 <https://github.com/rust-lang/rust/issues/44930> for more information
    = help: add `#![feature(c_variadic)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-cfg-relocation-model.stderr b/tests/ui/feature-gates/feature-gate-cfg-relocation-model.stderr
index bd43e190513fb..e107e49b0881f 100644
--- a/tests/ui/feature-gates/feature-gate-cfg-relocation-model.stderr
+++ b/tests/ui/feature-gates/feature-gate-cfg-relocation-model.stderr
@@ -6,6 +6,7 @@ LL | #[cfg(relocation_model = "pic")]
    |
    = note: see issue #114929 <https://github.com/rust-lang/rust/issues/114929> for more information
    = help: add `#![feature(cfg_relocation_model)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-cfg-sanitizer_cfi.stderr b/tests/ui/feature-gates/feature-gate-cfg-sanitizer_cfi.stderr
index 8c2a8411c7b4b..0d49635b2e6f2 100644
--- a/tests/ui/feature-gates/feature-gate-cfg-sanitizer_cfi.stderr
+++ b/tests/ui/feature-gates/feature-gate-cfg-sanitizer_cfi.stderr
@@ -6,6 +6,7 @@ LL | #[cfg(sanitizer_cfi_generalize_pointers)]
    |
    = note: see issue #89653 <https://github.com/rust-lang/rust/issues/89653> for more information
    = help: add `#![feature(cfg_sanitizer_cfi)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `cfg(sanitizer_cfi_normalize_integers)` is experimental and subject to change
   --> $DIR/feature-gate-cfg-sanitizer_cfi.rs:5:7
@@ -15,6 +16,7 @@ LL | #[cfg(sanitizer_cfi_normalize_integers)]
    |
    = note: see issue #89653 <https://github.com/rust-lang/rust/issues/89653> for more information
    = help: add `#![feature(cfg_sanitizer_cfi)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-cfg-target-abi.stderr b/tests/ui/feature-gates/feature-gate-cfg-target-abi.stderr
index 013705d4886de..4829f8572cc5f 100644
--- a/tests/ui/feature-gates/feature-gate-cfg-target-abi.stderr
+++ b/tests/ui/feature-gates/feature-gate-cfg-target-abi.stderr
@@ -6,6 +6,7 @@ LL | #[cfg(target_abi = "x")]
    |
    = note: see issue #80970 <https://github.com/rust-lang/rust/issues/80970> for more information
    = help: add `#![feature(cfg_target_abi)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `cfg(target_abi)` is experimental and subject to change
   --> $DIR/feature-gate-cfg-target-abi.rs:4:12
@@ -15,6 +16,7 @@ LL | #[cfg_attr(target_abi = "x", x)]
    |
    = note: see issue #80970 <https://github.com/rust-lang/rust/issues/80970> for more information
    = help: add `#![feature(cfg_target_abi)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `cfg(target_abi)` is experimental and subject to change
   --> $DIR/feature-gate-cfg-target-abi.rs:7:19
@@ -24,6 +26,7 @@ LL | #[cfg(not(any(all(target_abi = "x"))))]
    |
    = note: see issue #80970 <https://github.com/rust-lang/rust/issues/80970> for more information
    = help: add `#![feature(cfg_target_abi)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `cfg(target_abi)` is experimental and subject to change
   --> $DIR/feature-gate-cfg-target-abi.rs:11:10
@@ -33,6 +36,7 @@ LL |     cfg!(target_abi = "x");
    |
    = note: see issue #80970 <https://github.com/rust-lang/rust/issues/80970> for more information
    = help: add `#![feature(cfg_target_abi)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 4 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-cfg-target-compact.stderr b/tests/ui/feature-gates/feature-gate-cfg-target-compact.stderr
index be6fe23ded171..1fd59651957ed 100644
--- a/tests/ui/feature-gates/feature-gate-cfg-target-compact.stderr
+++ b/tests/ui/feature-gates/feature-gate-cfg-target-compact.stderr
@@ -6,6 +6,7 @@ LL | #[cfg(target(os = "x"))]
    |
    = note: see issue #96901 <https://github.com/rust-lang/rust/issues/96901> for more information
    = help: add `#![feature(cfg_target_compact)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: compact `cfg(target(..))` is experimental and subject to change
   --> $DIR/feature-gate-cfg-target-compact.rs:4:12
@@ -15,6 +16,7 @@ LL | #[cfg_attr(target(os = "x"), x)]
    |
    = note: see issue #96901 <https://github.com/rust-lang/rust/issues/96901> for more information
    = help: add `#![feature(cfg_target_compact)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: compact `cfg(target(..))` is experimental and subject to change
   --> $DIR/feature-gate-cfg-target-compact.rs:7:19
@@ -24,6 +26,7 @@ LL | #[cfg(not(any(all(target(os = "x")))))]
    |
    = note: see issue #96901 <https://github.com/rust-lang/rust/issues/96901> for more information
    = help: add `#![feature(cfg_target_compact)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: compact `cfg(target(..))` is experimental and subject to change
   --> $DIR/feature-gate-cfg-target-compact.rs:11:10
@@ -33,6 +36,7 @@ LL |     cfg!(target(os = "x"));
    |
    = note: see issue #96901 <https://github.com/rust-lang/rust/issues/96901> for more information
    = help: add `#![feature(cfg_target_compact)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 4 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-cfg-target-has-atomic-equal-alignment.stderr b/tests/ui/feature-gates/feature-gate-cfg-target-has-atomic-equal-alignment.stderr
index 8ad3b034aa51f..8d5d232ccc485 100644
--- a/tests/ui/feature-gates/feature-gate-cfg-target-has-atomic-equal-alignment.stderr
+++ b/tests/ui/feature-gates/feature-gate-cfg-target-has-atomic-equal-alignment.stderr
@@ -6,6 +6,7 @@ LL |     cfg!(target_has_atomic_equal_alignment = "8");
    |
    = note: see issue #93822 <https://github.com/rust-lang/rust/issues/93822> for more information
    = help: add `#![feature(cfg_target_has_atomic_equal_alignment)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `cfg(target_has_atomic_equal_alignment)` is experimental and subject to change
   --> $DIR/feature-gate-cfg-target-has-atomic-equal-alignment.rs:4:10
@@ -15,6 +16,7 @@ LL |     cfg!(target_has_atomic_equal_alignment = "16");
    |
    = note: see issue #93822 <https://github.com/rust-lang/rust/issues/93822> for more information
    = help: add `#![feature(cfg_target_has_atomic_equal_alignment)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `cfg(target_has_atomic_equal_alignment)` is experimental and subject to change
   --> $DIR/feature-gate-cfg-target-has-atomic-equal-alignment.rs:6:10
@@ -24,6 +26,7 @@ LL |     cfg!(target_has_atomic_equal_alignment = "32");
    |
    = note: see issue #93822 <https://github.com/rust-lang/rust/issues/93822> for more information
    = help: add `#![feature(cfg_target_has_atomic_equal_alignment)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `cfg(target_has_atomic_equal_alignment)` is experimental and subject to change
   --> $DIR/feature-gate-cfg-target-has-atomic-equal-alignment.rs:8:10
@@ -33,6 +36,7 @@ LL |     cfg!(target_has_atomic_equal_alignment = "64");
    |
    = note: see issue #93822 <https://github.com/rust-lang/rust/issues/93822> for more information
    = help: add `#![feature(cfg_target_has_atomic_equal_alignment)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `cfg(target_has_atomic_equal_alignment)` is experimental and subject to change
   --> $DIR/feature-gate-cfg-target-has-atomic-equal-alignment.rs:10:10
@@ -42,6 +46,7 @@ LL |     cfg!(target_has_atomic_equal_alignment = "128");
    |
    = note: see issue #93822 <https://github.com/rust-lang/rust/issues/93822> for more information
    = help: add `#![feature(cfg_target_has_atomic_equal_alignment)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `cfg(target_has_atomic_equal_alignment)` is experimental and subject to change
   --> $DIR/feature-gate-cfg-target-has-atomic-equal-alignment.rs:12:10
@@ -51,6 +56,7 @@ LL |     cfg!(target_has_atomic_equal_alignment = "ptr");
    |
    = note: see issue #93822 <https://github.com/rust-lang/rust/issues/93822> for more information
    = help: add `#![feature(cfg_target_has_atomic_equal_alignment)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 6 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-cfg-target-has-atomic.stderr b/tests/ui/feature-gates/feature-gate-cfg-target-has-atomic.stderr
index b9e6830a9f0f8..f253ec3bef1c9 100644
--- a/tests/ui/feature-gates/feature-gate-cfg-target-has-atomic.stderr
+++ b/tests/ui/feature-gates/feature-gate-cfg-target-has-atomic.stderr
@@ -6,6 +6,7 @@ LL |     cfg!(target_has_atomic_load_store = "8");
    |
    = note: see issue #94039 <https://github.com/rust-lang/rust/issues/94039> for more information
    = help: add `#![feature(cfg_target_has_atomic)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `cfg(target_has_atomic_load_store)` is experimental and subject to change
   --> $DIR/feature-gate-cfg-target-has-atomic.rs:4:10
@@ -15,6 +16,7 @@ LL |     cfg!(target_has_atomic_load_store = "16");
    |
    = note: see issue #94039 <https://github.com/rust-lang/rust/issues/94039> for more information
    = help: add `#![feature(cfg_target_has_atomic)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `cfg(target_has_atomic_load_store)` is experimental and subject to change
   --> $DIR/feature-gate-cfg-target-has-atomic.rs:6:10
@@ -24,6 +26,7 @@ LL |     cfg!(target_has_atomic_load_store = "32");
    |
    = note: see issue #94039 <https://github.com/rust-lang/rust/issues/94039> for more information
    = help: add `#![feature(cfg_target_has_atomic)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `cfg(target_has_atomic_load_store)` is experimental and subject to change
   --> $DIR/feature-gate-cfg-target-has-atomic.rs:8:10
@@ -33,6 +36,7 @@ LL |     cfg!(target_has_atomic_load_store = "64");
    |
    = note: see issue #94039 <https://github.com/rust-lang/rust/issues/94039> for more information
    = help: add `#![feature(cfg_target_has_atomic)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `cfg(target_has_atomic_load_store)` is experimental and subject to change
   --> $DIR/feature-gate-cfg-target-has-atomic.rs:10:10
@@ -42,6 +46,7 @@ LL |     cfg!(target_has_atomic_load_store = "128");
    |
    = note: see issue #94039 <https://github.com/rust-lang/rust/issues/94039> for more information
    = help: add `#![feature(cfg_target_has_atomic)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `cfg(target_has_atomic_load_store)` is experimental and subject to change
   --> $DIR/feature-gate-cfg-target-has-atomic.rs:12:10
@@ -51,6 +56,7 @@ LL |     cfg!(target_has_atomic_load_store = "ptr");
    |
    = note: see issue #94039 <https://github.com/rust-lang/rust/issues/94039> for more information
    = help: add `#![feature(cfg_target_has_atomic)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 6 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-cfg-target-thread-local.stderr b/tests/ui/feature-gates/feature-gate-cfg-target-thread-local.stderr
index 3400808bb728e..0e1fe5572a982 100644
--- a/tests/ui/feature-gates/feature-gate-cfg-target-thread-local.stderr
+++ b/tests/ui/feature-gates/feature-gate-cfg-target-thread-local.stderr
@@ -6,6 +6,7 @@ LL |     #[cfg_attr(target_thread_local, thread_local)]
    |
    = note: see issue #29594 <https://github.com/rust-lang/rust/issues/29594> for more information
    = help: add `#![feature(cfg_target_thread_local)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-cfg-version.stderr b/tests/ui/feature-gates/feature-gate-cfg-version.stderr
index ae899d409ecf9..c1c3e8e5897a6 100644
--- a/tests/ui/feature-gates/feature-gate-cfg-version.stderr
+++ b/tests/ui/feature-gates/feature-gate-cfg-version.stderr
@@ -6,6 +6,7 @@ LL | #[cfg(version(42))]
    |
    = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
    = help: add `#![feature(cfg_version)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: expected a version literal
   --> $DIR/feature-gate-cfg-version.rs:1:15
@@ -21,6 +22,7 @@ LL | #[cfg(version(1.20))]
    |
    = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
    = help: add `#![feature(cfg_version)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: expected a version literal
   --> $DIR/feature-gate-cfg-version.rs:4:15
@@ -36,6 +38,7 @@ LL | #[cfg(version("1.44"))]
    |
    = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
    = help: add `#![feature(cfg_version)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `cfg(version)` is experimental and subject to change
   --> $DIR/feature-gate-cfg-version.rs:10:11
@@ -45,6 +48,7 @@ LL | #[cfg(not(version("1.44")))]
    |
    = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
    = help: add `#![feature(cfg_version)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `cfg(version)` is experimental and subject to change
   --> $DIR/feature-gate-cfg-version.rs:14:7
@@ -54,6 +58,7 @@ LL | #[cfg(version("1.43", "1.44", "1.45"))]
    |
    = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
    = help: add `#![feature(cfg_version)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: expected single version literal
   --> $DIR/feature-gate-cfg-version.rs:14:7
@@ -69,6 +74,7 @@ LL | #[cfg(version(false))]
    |
    = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
    = help: add `#![feature(cfg_version)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: expected a version literal
   --> $DIR/feature-gate-cfg-version.rs:17:15
@@ -84,6 +90,7 @@ LL | #[cfg(version("foo"))]
    |
    = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
    = help: add `#![feature(cfg_version)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 warning: unknown version literal format, assuming it refers to a future version
   --> $DIR/feature-gate-cfg-version.rs:20:15
@@ -99,6 +106,7 @@ LL | #[cfg(version("999"))]
    |
    = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
    = help: add `#![feature(cfg_version)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 warning: unknown version literal format, assuming it refers to a future version
   --> $DIR/feature-gate-cfg-version.rs:23:15
@@ -114,6 +122,7 @@ LL | #[cfg(version("-1"))]
    |
    = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
    = help: add `#![feature(cfg_version)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 warning: unknown version literal format, assuming it refers to a future version
   --> $DIR/feature-gate-cfg-version.rs:26:15
@@ -129,6 +138,7 @@ LL | #[cfg(version("65536"))]
    |
    = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
    = help: add `#![feature(cfg_version)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 warning: unknown version literal format, assuming it refers to a future version
   --> $DIR/feature-gate-cfg-version.rs:29:15
@@ -144,6 +154,7 @@ LL | #[cfg(version("0"))]
    |
    = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
    = help: add `#![feature(cfg_version)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 warning: unknown version literal format, assuming it refers to a future version
   --> $DIR/feature-gate-cfg-version.rs:32:15
@@ -159,6 +170,7 @@ LL | #[cfg(version("1.0"))]
    |
    = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
    = help: add `#![feature(cfg_version)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `cfg(version)` is experimental and subject to change
   --> $DIR/feature-gate-cfg-version.rs:38:7
@@ -168,6 +180,7 @@ LL | #[cfg(version("1.65536.2"))]
    |
    = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
    = help: add `#![feature(cfg_version)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 warning: unknown version literal format, assuming it refers to a future version
   --> $DIR/feature-gate-cfg-version.rs:38:15
@@ -183,6 +196,7 @@ LL | #[cfg(version("1.20.0-stable"))]
    |
    = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
    = help: add `#![feature(cfg_version)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 warning: unknown version literal format, assuming it refers to a future version
   --> $DIR/feature-gate-cfg-version.rs:41:15
@@ -198,6 +212,7 @@ LL |     assert!(cfg!(version("1.42")));
    |
    = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
    = help: add `#![feature(cfg_version)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 19 previous errors; 7 warnings emitted
 
diff --git a/tests/ui/feature-gates/feature-gate-cfg_overflow_checks.stderr b/tests/ui/feature-gates/feature-gate-cfg_overflow_checks.stderr
index 22f9af8390d4b..d5c0cd5927a89 100644
--- a/tests/ui/feature-gates/feature-gate-cfg_overflow_checks.stderr
+++ b/tests/ui/feature-gates/feature-gate-cfg_overflow_checks.stderr
@@ -6,6 +6,7 @@ LL | #[cfg(overflow_checks)]
    |
    = note: see issue #111466 <https://github.com/rust-lang/rust/issues/111466> for more information
    = help: add `#![feature(cfg_overflow_checks)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-cfg_sanitize.stderr b/tests/ui/feature-gates/feature-gate-cfg_sanitize.stderr
index b53fc3acdbcc9..da29b0c96a3f9 100644
--- a/tests/ui/feature-gates/feature-gate-cfg_sanitize.stderr
+++ b/tests/ui/feature-gates/feature-gate-cfg_sanitize.stderr
@@ -6,6 +6,7 @@ LL | #[cfg(not(sanitize = "thread"))]
    |
    = note: see issue #39699 <https://github.com/rust-lang/rust/issues/39699> for more information
    = help: add `#![feature(cfg_sanitize)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-cfi_encoding.stderr b/tests/ui/feature-gates/feature-gate-cfi_encoding.stderr
index 04b206499405a..ae5efc0275f21 100644
--- a/tests/ui/feature-gates/feature-gate-cfi_encoding.stderr
+++ b/tests/ui/feature-gates/feature-gate-cfi_encoding.stderr
@@ -6,6 +6,7 @@ LL | #[cfi_encoding = "3Bar"]
    |
    = note: see issue #89653 <https://github.com/rust-lang/rust/issues/89653> for more information
    = help: add `#![feature(cfi_encoding)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-closure_lifetime_binder.stderr b/tests/ui/feature-gates/feature-gate-closure_lifetime_binder.stderr
index aea5cfeed0705..96e428fb9a37e 100644
--- a/tests/ui/feature-gates/feature-gate-closure_lifetime_binder.stderr
+++ b/tests/ui/feature-gates/feature-gate-closure_lifetime_binder.stderr
@@ -6,6 +6,7 @@ LL |     for<> || -> () {};
    |
    = note: see issue #97362 <https://github.com/rust-lang/rust/issues/97362> for more information
    = help: add `#![feature(closure_lifetime_binder)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: consider removing `for<...>`
 
 error[E0658]: `for<...>` binders for closures are experimental
@@ -16,6 +17,7 @@ LL |     for<'a> || -> () {};
    |
    = note: see issue #97362 <https://github.com/rust-lang/rust/issues/97362> for more information
    = help: add `#![feature(closure_lifetime_binder)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: consider removing `for<...>`
 
 error[E0658]: `for<...>` binders for closures are experimental
@@ -26,6 +28,7 @@ LL |     for<'a, 'b> |_: &'a ()| -> () {};
    |
    = note: see issue #97362 <https://github.com/rust-lang/rust/issues/97362> for more information
    = help: add `#![feature(closure_lifetime_binder)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: consider removing `for<...>`
 
 error: aborting due to 3 previous errors
diff --git a/tests/ui/feature-gates/feature-gate-closure_track_caller.stderr b/tests/ui/feature-gates/feature-gate-closure_track_caller.stderr
index d5ef5d09ed451..17b5e6016a461 100644
--- a/tests/ui/feature-gates/feature-gate-closure_track_caller.stderr
+++ b/tests/ui/feature-gates/feature-gate-closure_track_caller.stderr
@@ -6,6 +6,7 @@ LL |     let _closure = #[track_caller] || {};
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `#[track_caller]` on closures is currently unstable
   --> $DIR/feature-gate-closure_track_caller.rs:7:22
@@ -15,6 +16,7 @@ LL |     let _coroutine = #[track_caller] || { yield; };
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `#[track_caller]` on closures is currently unstable
   --> $DIR/feature-gate-closure_track_caller.rs:8:19
@@ -24,6 +26,7 @@ LL |     let _future = #[track_caller] async {};
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-collapse_debuginfo.stderr b/tests/ui/feature-gates/feature-gate-collapse_debuginfo.stderr
index f0b8fd1f373a6..f361a76b4a739 100644
--- a/tests/ui/feature-gates/feature-gate-collapse_debuginfo.stderr
+++ b/tests/ui/feature-gates/feature-gate-collapse_debuginfo.stderr
@@ -6,6 +6,7 @@ LL | #[collapse_debuginfo]
    |
    = note: see issue #100758 <https://github.com/rust-lang/rust/issues/100758> for more information
    = help: add `#![feature(collapse_debuginfo)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-compiler-builtins.stderr b/tests/ui/feature-gates/feature-gate-compiler-builtins.stderr
index eadc4ddcb286a..65137a442b043 100644
--- a/tests/ui/feature-gates/feature-gate-compiler-builtins.stderr
+++ b/tests/ui/feature-gates/feature-gate-compiler-builtins.stderr
@@ -5,6 +5,7 @@ LL | #![compiler_builtins]
    | ^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(compiler_builtins)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-concat_bytes.stderr b/tests/ui/feature-gates/feature-gate-concat_bytes.stderr
index 69b196335daeb..ed9692d369304 100644
--- a/tests/ui/feature-gates/feature-gate-concat_bytes.stderr
+++ b/tests/ui/feature-gates/feature-gate-concat_bytes.stderr
@@ -6,6 +6,7 @@ LL |     let a = concat_bytes!(b'A', b"BC");
    |
    = note: see issue #87555 <https://github.com/rust-lang/rust/issues/87555> for more information
    = help: add `#![feature(concat_bytes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-concat_idents.stderr b/tests/ui/feature-gates/feature-gate-concat_idents.stderr
index 0454fd4945cd9..eaaef0f2539bc 100644
--- a/tests/ui/feature-gates/feature-gate-concat_idents.stderr
+++ b/tests/ui/feature-gates/feature-gate-concat_idents.stderr
@@ -6,6 +6,7 @@ LL |     let a = concat_idents!(X, Y_1);
    |
    = note: see issue #29599 <https://github.com/rust-lang/rust/issues/29599> for more information
    = help: add `#![feature(concat_idents)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'concat_idents': `concat_idents` is not stable enough for use and is subject to change
   --> $DIR/feature-gate-concat_idents.rs:6:13
@@ -15,6 +16,7 @@ LL |     let b = concat_idents!(X, Y_2);
    |
    = note: see issue #29599 <https://github.com/rust-lang/rust/issues/29599> for more information
    = help: add `#![feature(concat_idents)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-concat_idents2.stderr b/tests/ui/feature-gates/feature-gate-concat_idents2.stderr
index 8663bc7ca7e77..2fe786ff4063d 100644
--- a/tests/ui/feature-gates/feature-gate-concat_idents2.stderr
+++ b/tests/ui/feature-gates/feature-gate-concat_idents2.stderr
@@ -6,6 +6,7 @@ LL |     concat_idents!(a, b);
    |
    = note: see issue #29599 <https://github.com/rust-lang/rust/issues/29599> for more information
    = help: add `#![feature(concat_idents)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0425]: cannot find value `ab` in this scope
   --> $DIR/feature-gate-concat_idents2.rs:2:5
diff --git a/tests/ui/feature-gates/feature-gate-concat_idents3.stderr b/tests/ui/feature-gates/feature-gate-concat_idents3.stderr
index 1316107a3dca6..a7daa1f949f01 100644
--- a/tests/ui/feature-gates/feature-gate-concat_idents3.stderr
+++ b/tests/ui/feature-gates/feature-gate-concat_idents3.stderr
@@ -6,6 +6,7 @@ LL |     assert_eq!(10, concat_idents!(X, Y_1));
    |
    = note: see issue #29599 <https://github.com/rust-lang/rust/issues/29599> for more information
    = help: add `#![feature(concat_idents)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'concat_idents': `concat_idents` is not stable enough for use and is subject to change
   --> $DIR/feature-gate-concat_idents3.rs:6:20
@@ -15,6 +16,7 @@ LL |     assert_eq!(20, concat_idents!(X, Y_2));
    |
    = note: see issue #29599 <https://github.com/rust-lang/rust/issues/29599> for more information
    = help: add `#![feature(concat_idents)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-coroutines.e2024.stderr b/tests/ui/feature-gates/feature-gate-coroutines.e2024.stderr
index 2e529236ad8fe..1cef163cef5c2 100644
--- a/tests/ui/feature-gates/feature-gate-coroutines.e2024.stderr
+++ b/tests/ui/feature-gates/feature-gate-coroutines.e2024.stderr
@@ -6,6 +6,7 @@ LL |     yield true;
    |
    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
    = help: add `#![feature(coroutines)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: yield syntax is experimental
   --> $DIR/feature-gate-coroutines.rs:9:16
@@ -15,6 +16,7 @@ LL |     let _ = || yield true;
    |
    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
    = help: add `#![feature(coroutines)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0627]: yield expression outside of coroutine literal
   --> $DIR/feature-gate-coroutines.rs:5:5
diff --git a/tests/ui/feature-gates/feature-gate-coroutines.none.stderr b/tests/ui/feature-gates/feature-gate-coroutines.none.stderr
index ab24805e46777..403f0549aef27 100644
--- a/tests/ui/feature-gates/feature-gate-coroutines.none.stderr
+++ b/tests/ui/feature-gates/feature-gate-coroutines.none.stderr
@@ -6,6 +6,7 @@ LL |     yield true;
    |
    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
    = help: add `#![feature(coroutines)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: yield syntax is experimental
   --> $DIR/feature-gate-coroutines.rs:9:16
@@ -15,6 +16,7 @@ LL |     let _ = || yield true;
    |
    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
    = help: add `#![feature(coroutines)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: yield syntax is experimental
   --> $DIR/feature-gate-coroutines.rs:16:5
@@ -24,6 +26,7 @@ LL |     yield;
    |
    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
    = help: add `#![feature(coroutines)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: yield syntax is experimental
   --> $DIR/feature-gate-coroutines.rs:17:5
@@ -33,6 +36,7 @@ LL |     yield 0;
    |
    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
    = help: add `#![feature(coroutines)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: yield syntax is experimental
   --> $DIR/feature-gate-coroutines.rs:5:5
@@ -42,6 +46,7 @@ LL |     yield true;
    |
    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
    = help: add `#![feature(coroutines)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error[E0658]: yield syntax is experimental
@@ -52,6 +57,7 @@ LL |     let _ = || yield true;
    |
    = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
    = help: add `#![feature(coroutines)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error[E0627]: yield expression outside of coroutine literal
diff --git a/tests/ui/feature-gates/feature-gate-coverage-attribute.stderr b/tests/ui/feature-gates/feature-gate-coverage-attribute.stderr
index 0131a19a39dde..00e0f0afbde67 100644
--- a/tests/ui/feature-gates/feature-gate-coverage-attribute.stderr
+++ b/tests/ui/feature-gates/feature-gate-coverage-attribute.stderr
@@ -14,6 +14,7 @@ LL | #[coverage(off)]
    |
    = note: see issue #84605 <https://github.com/rust-lang/rust/issues/84605> for more information
    = help: add `#![feature(coverage_attribute)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-custom_mir.stderr b/tests/ui/feature-gates/feature-gate-custom_mir.stderr
index f0f67adcca581..34899e5e66c08 100644
--- a/tests/ui/feature-gates/feature-gate-custom_mir.stderr
+++ b/tests/ui/feature-gates/feature-gate-custom_mir.stderr
@@ -5,6 +5,7 @@ LL | #[custom_mir(dialect = "built")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(custom_mir)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-custom_test_frameworks.stderr b/tests/ui/feature-gates/feature-gate-custom_test_frameworks.stderr
index b65b009a34228..016be980d4d64 100644
--- a/tests/ui/feature-gates/feature-gate-custom_test_frameworks.stderr
+++ b/tests/ui/feature-gates/feature-gate-custom_test_frameworks.stderr
@@ -6,6 +6,7 @@ LL | #[test_case]
    |
    = note: see issue #50297 <https://github.com/rust-lang/rust/issues/50297> for more information
    = help: add `#![feature(custom_test_frameworks)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: custom test frameworks are an unstable feature
   --> $DIR/feature-gate-custom_test_frameworks.rs:1:1
@@ -15,6 +16,7 @@ LL | #![test_runner(main)]
    |
    = note: see issue #50297 <https://github.com/rust-lang/rust/issues/50297> for more information
    = help: add `#![feature(custom_test_frameworks)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-decl_macro.stderr b/tests/ui/feature-gates/feature-gate-decl_macro.stderr
index 94b609f05262d..e76fe3714ea14 100644
--- a/tests/ui/feature-gates/feature-gate-decl_macro.stderr
+++ b/tests/ui/feature-gates/feature-gate-decl_macro.stderr
@@ -6,6 +6,7 @@ LL | macro m() {}
    |
    = note: see issue #39412 <https://github.com/rust-lang/rust/issues/39412> for more information
    = help: add `#![feature(decl_macro)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-deprecated_safe.stderr b/tests/ui/feature-gates/feature-gate-deprecated_safe.stderr
index 5e98a1faaa301..415d54463d1a4 100644
--- a/tests/ui/feature-gates/feature-gate-deprecated_safe.stderr
+++ b/tests/ui/feature-gates/feature-gate-deprecated_safe.stderr
@@ -6,6 +6,7 @@ LL | #[deprecated_safe(since = "TBD", note = "...")]
    |
    = note: see issue #94978 <https://github.com/rust-lang/rust/issues/94978> for more information
    = help: add `#![feature(deprecated_safe)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: the `#[deprecated_safe]` attribute is an experimental feature
   --> $DIR/feature-gate-deprecated_safe.rs:4:1
@@ -15,6 +16,7 @@ LL | #[deprecated_safe(since = "TBD", note = "...")]
    |
    = note: see issue #94978 <https://github.com/rust-lang/rust/issues/94978> for more information
    = help: add `#![feature(deprecated_safe)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-doc_cfg.stderr b/tests/ui/feature-gates/feature-gate-doc_cfg.stderr
index 1a313a86f7cc2..5315aaeeb3edb 100644
--- a/tests/ui/feature-gates/feature-gate-doc_cfg.stderr
+++ b/tests/ui/feature-gates/feature-gate-doc_cfg.stderr
@@ -6,6 +6,7 @@ LL | #[doc(cfg(unix))]
    |
    = note: see issue #43781 <https://github.com/rust-lang/rust/issues/43781> for more information
    = help: add `#![feature(doc_cfg)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-doc_masked.stderr b/tests/ui/feature-gates/feature-gate-doc_masked.stderr
index 96377d8d03647..10607a19757cb 100644
--- a/tests/ui/feature-gates/feature-gate-doc_masked.stderr
+++ b/tests/ui/feature-gates/feature-gate-doc_masked.stderr
@@ -6,6 +6,7 @@ LL | #[doc(masked)]
    |
    = note: see issue #44027 <https://github.com/rust-lang/rust/issues/44027> for more information
    = help: add `#![feature(doc_masked)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-doc_notable_trait.stderr b/tests/ui/feature-gates/feature-gate-doc_notable_trait.stderr
index d19d3fa0ff7f0..1b40b9ac18a8f 100644
--- a/tests/ui/feature-gates/feature-gate-doc_notable_trait.stderr
+++ b/tests/ui/feature-gates/feature-gate-doc_notable_trait.stderr
@@ -6,6 +6,7 @@ LL | #[doc(notable_trait)]
    |
    = note: see issue #45040 <https://github.com/rust-lang/rust/issues/45040> for more information
    = help: add `#![feature(doc_notable_trait)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-exclusive-range-pattern.stderr b/tests/ui/feature-gates/feature-gate-exclusive-range-pattern.stderr
index 4a0c8d7fdc3f9..d05971fb0529d 100644
--- a/tests/ui/feature-gates/feature-gate-exclusive-range-pattern.stderr
+++ b/tests/ui/feature-gates/feature-gate-exclusive-range-pattern.stderr
@@ -6,6 +6,7 @@ LL |         0 .. 3 => {}
    |
    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-explicit_tail_calls.stderr b/tests/ui/feature-gates/feature-gate-explicit_tail_calls.stderr
index b58da19c1745f..8447ac41e2ca3 100644
--- a/tests/ui/feature-gates/feature-gate-explicit_tail_calls.stderr
+++ b/tests/ui/feature-gates/feature-gate-explicit_tail_calls.stderr
@@ -6,6 +6,7 @@ LL |     become bottom();
    |
    = note: see issue #112788 <https://github.com/rust-lang/rust/issues/112788> for more information
    = help: add `#![feature(explicit_tail_calls)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `become` expression is experimental
   --> $DIR/feature-gate-explicit_tail_calls.rs:6:5
@@ -15,6 +16,7 @@ LL |     become you();
    |
    = note: see issue #112788 <https://github.com/rust-lang/rust/issues/112788> for more information
    = help: add `#![feature(explicit_tail_calls)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-extern_types.stderr b/tests/ui/feature-gates/feature-gate-extern_types.stderr
index 17ce01fd59bbf..599713b452a6c 100644
--- a/tests/ui/feature-gates/feature-gate-extern_types.stderr
+++ b/tests/ui/feature-gates/feature-gate-extern_types.stderr
@@ -6,6 +6,7 @@ LL |     type T;
    |
    = note: see issue #43467 <https://github.com/rust-lang/rust/issues/43467> for more information
    = help: add `#![feature(extern_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-ffi_const.stderr b/tests/ui/feature-gates/feature-gate-ffi_const.stderr
index c86606f335275..d083b826d6e1c 100644
--- a/tests/ui/feature-gates/feature-gate-ffi_const.stderr
+++ b/tests/ui/feature-gates/feature-gate-ffi_const.stderr
@@ -6,6 +6,7 @@ LL |     #[ffi_const]
    |
    = note: see issue #58328 <https://github.com/rust-lang/rust/issues/58328> for more information
    = help: add `#![feature(ffi_const)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-ffi_pure.stderr b/tests/ui/feature-gates/feature-gate-ffi_pure.stderr
index 4392fb16deb4f..6544d450eeb9f 100644
--- a/tests/ui/feature-gates/feature-gate-ffi_pure.stderr
+++ b/tests/ui/feature-gates/feature-gate-ffi_pure.stderr
@@ -6,6 +6,7 @@ LL |     #[ffi_pure]
    |
    = note: see issue #58329 <https://github.com/rust-lang/rust/issues/58329> for more information
    = help: add `#![feature(ffi_pure)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-ffi_returns_twice.stderr b/tests/ui/feature-gates/feature-gate-ffi_returns_twice.stderr
index 7a030d4546042..8d19874c36a0c 100644
--- a/tests/ui/feature-gates/feature-gate-ffi_returns_twice.stderr
+++ b/tests/ui/feature-gates/feature-gate-ffi_returns_twice.stderr
@@ -6,6 +6,7 @@ LL |     #[ffi_returns_twice]
    |
    = note: see issue #58314 <https://github.com/rust-lang/rust/issues/58314> for more information
    = help: add `#![feature(ffi_returns_twice)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-fn_align.stderr b/tests/ui/feature-gates/feature-gate-fn_align.stderr
index 3351ceaf2f019..eec332792b76e 100644
--- a/tests/ui/feature-gates/feature-gate-fn_align.stderr
+++ b/tests/ui/feature-gates/feature-gate-fn_align.stderr
@@ -6,6 +6,7 @@ LL | #[repr(align(16))]
    |
    = note: see issue #82232 <https://github.com/rust-lang/rust/issues/82232> for more information
    = help: add `#![feature(fn_align)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-format_args_nl.stderr b/tests/ui/feature-gates/feature-gate-format_args_nl.stderr
index 35a712aad8a15..f72d34d9b0bcb 100644
--- a/tests/ui/feature-gates/feature-gate-format_args_nl.stderr
+++ b/tests/ui/feature-gates/feature-gate-format_args_nl.stderr
@@ -5,6 +5,7 @@ LL |     format_args_nl!("");
    |     ^^^^^^^^^^^^^^
    |
    = help: add `#![feature(format_args_nl)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-fundamental.stderr b/tests/ui/feature-gates/feature-gate-fundamental.stderr
index 14ee169bdaa2c..61b30dfb29cd8 100644
--- a/tests/ui/feature-gates/feature-gate-fundamental.stderr
+++ b/tests/ui/feature-gates/feature-gate-fundamental.stderr
@@ -6,6 +6,7 @@ LL | #[fundamental]
    |
    = note: see issue #29635 <https://github.com/rust-lang/rust/issues/29635> for more information
    = help: add `#![feature(fundamental)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-gen_blocks.e2024.stderr b/tests/ui/feature-gates/feature-gate-gen_blocks.e2024.stderr
index 526354f6cfbdf..7cdcaeaee5750 100644
--- a/tests/ui/feature-gates/feature-gate-gen_blocks.e2024.stderr
+++ b/tests/ui/feature-gates/feature-gate-gen_blocks.e2024.stderr
@@ -6,6 +6,7 @@ LL |     gen {};
    |
    = note: see issue #117078 <https://github.com/rust-lang/rust/issues/117078> for more information
    = help: add `#![feature(gen_blocks)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: gen blocks are experimental
   --> $DIR/feature-gate-gen_blocks.rs:12:5
@@ -15,6 +16,7 @@ LL |     async gen {};
    |
    = note: see issue #117078 <https://github.com/rust-lang/rust/issues/117078> for more information
    = help: add `#![feature(gen_blocks)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: gen blocks are experimental
   --> $DIR/feature-gate-gen_blocks.rs:22:5
@@ -24,6 +26,7 @@ LL |     gen {};
    |
    = note: see issue #117078 <https://github.com/rust-lang/rust/issues/117078> for more information
    = help: add `#![feature(gen_blocks)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: gen blocks are experimental
   --> $DIR/feature-gate-gen_blocks.rs:25:5
@@ -33,6 +36,7 @@ LL |     async gen {};
    |
    = note: see issue #117078 <https://github.com/rust-lang/rust/issues/117078> for more information
    = help: add `#![feature(gen_blocks)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0282]: type annotations needed
   --> $DIR/feature-gate-gen_blocks.rs:5:5
diff --git a/tests/ui/feature-gates/feature-gate-generic_arg_infer.normal.stderr b/tests/ui/feature-gates/feature-gate-generic_arg_infer.normal.stderr
index 56123a983b34f..bc022476c19c0 100644
--- a/tests/ui/feature-gates/feature-gate-generic_arg_infer.normal.stderr
+++ b/tests/ui/feature-gates/feature-gate-generic_arg_infer.normal.stderr
@@ -18,6 +18,7 @@ LL |     let _y: [u8; _] = [0; 3];
    |
    = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
    = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0747]: type provided when a constant was expected
   --> $DIR/feature-gate-generic_arg_infer.rs:20:20
@@ -36,6 +37,7 @@ LL |     let _x: [u8; 3] = [0; _];
    |
    = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
    = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 5 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-generic_associated_types_extended.stderr b/tests/ui/feature-gates/feature-gate-generic_associated_types_extended.stderr
index e5265b67eaba1..a5ab1b0d6313e 100644
--- a/tests/ui/feature-gates/feature-gate-generic_associated_types_extended.stderr
+++ b/tests/ui/feature-gates/feature-gate-generic_associated_types_extended.stderr
@@ -5,6 +5,7 @@ LL | #[rustc_error]
    | ^^^^^^^^^^^^^^
    |
    = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-impl_trait_in_assoc_type.stderr b/tests/ui/feature-gates/feature-gate-impl_trait_in_assoc_type.stderr
index 420363ced6f75..7dfd79c728641 100644
--- a/tests/ui/feature-gates/feature-gate-impl_trait_in_assoc_type.stderr
+++ b/tests/ui/feature-gates/feature-gate-impl_trait_in_assoc_type.stderr
@@ -6,6 +6,7 @@ LL |     type Bar = impl std::fmt::Debug;
    |
    = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
    = help: add `#![feature(impl_trait_in_assoc_type)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `impl Trait` in associated types is unstable
   --> $DIR/feature-gate-impl_trait_in_assoc_type.rs:14:16
@@ -15,6 +16,7 @@ LL |     type Bop = impl std::fmt::Debug;
    |
    = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
    = help: add `#![feature(impl_trait_in_assoc_type)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: inherent associated types are unstable
   --> $DIR/feature-gate-impl_trait_in_assoc_type.rs:14:5
@@ -24,6 +26,7 @@ LL |     type Bop = impl std::fmt::Debug;
    |
    = note: see issue #8995 <https://github.com/rust-lang/rust/issues/8995> for more information
    = help: add `#![feature(inherent_associated_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: unconstrained opaque type
   --> $DIR/feature-gate-impl_trait_in_assoc_type.rs:6:16
diff --git a/tests/ui/feature-gates/feature-gate-impl_trait_in_fn_trait_return.stderr b/tests/ui/feature-gates/feature-gate-impl_trait_in_fn_trait_return.stderr
index dacf1ca4c37c5..d939d8c5c28e1 100644
--- a/tests/ui/feature-gates/feature-gate-impl_trait_in_fn_trait_return.stderr
+++ b/tests/ui/feature-gates/feature-gate-impl_trait_in_fn_trait_return.stderr
@@ -7,6 +7,7 @@ LL | fn f() -> impl Fn() -> impl Sized { || () }
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
    = note: see issue #99697 <https://github.com/rust-lang/rust/issues/99697> for more information
    = help: add `#![feature(impl_trait_in_fn_trait_return)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0562]: `impl Trait` is not allowed in the return type of `Fn` trait bounds
   --> $DIR/feature-gate-impl_trait_in_fn_trait_return.rs:3:32
@@ -17,6 +18,7 @@ LL | fn g() -> &'static dyn Fn() -> impl Sized { &|| () }
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
    = note: see issue #99697 <https://github.com/rust-lang/rust/issues/99697> for more information
    = help: add `#![feature(impl_trait_in_fn_trait_return)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-imported_main.stderr b/tests/ui/feature-gates/feature-gate-imported_main.stderr
index 94cb74047c859..987bda7059c86 100644
--- a/tests/ui/feature-gates/feature-gate-imported_main.stderr
+++ b/tests/ui/feature-gates/feature-gate-imported_main.stderr
@@ -6,6 +6,7 @@ LL | use foo::bar as main;
    |
    = note: see issue #28937 <https://github.com/rust-lang/rust/issues/28937> for more information
    = help: add `#![feature(imported_main)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-inherent_associated_types.stderr b/tests/ui/feature-gates/feature-gate-inherent_associated_types.stderr
index 8e117422a7964..0eb7558b08ff6 100644
--- a/tests/ui/feature-gates/feature-gate-inherent_associated_types.stderr
+++ b/tests/ui/feature-gates/feature-gate-inherent_associated_types.stderr
@@ -6,6 +6,7 @@ LL |     type Bar = isize;
    |
    = note: see issue #8995 <https://github.com/rust-lang/rust/issues/8995> for more information
    = help: add `#![feature(inherent_associated_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-inline_const.stderr b/tests/ui/feature-gates/feature-gate-inline_const.stderr
index 3cb4aad003f48..6cf675065f34d 100644
--- a/tests/ui/feature-gates/feature-gate-inline_const.stderr
+++ b/tests/ui/feature-gates/feature-gate-inline_const.stderr
@@ -6,6 +6,7 @@ LL |     let _ = const {
    |
    = note: see issue #76001 <https://github.com/rust-lang/rust/issues/76001> for more information
    = help: add `#![feature(inline_const)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-inline_const_pat.stderr b/tests/ui/feature-gates/feature-gate-inline_const_pat.stderr
index eab024dde662a..7d7376fa818bb 100644
--- a/tests/ui/feature-gates/feature-gate-inline_const_pat.stderr
+++ b/tests/ui/feature-gates/feature-gate-inline_const_pat.stderr
@@ -6,6 +6,7 @@ LL |     let const { () } = ();
    |
    = note: see issue #76001 <https://github.com/rust-lang/rust/issues/76001> for more information
    = help: add `#![feature(inline_const_pat)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-intrinsics.stderr b/tests/ui/feature-gates/feature-gate-intrinsics.stderr
index 8f943d357ce02..ebd0f41715ea6 100644
--- a/tests/ui/feature-gates/feature-gate-intrinsics.stderr
+++ b/tests/ui/feature-gates/feature-gate-intrinsics.stderr
@@ -5,6 +5,7 @@ LL | extern "rust-intrinsic" {
    |        ^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: intrinsics are subject to change
   --> $DIR/feature-gate-intrinsics.rs:5:8
@@ -13,6 +14,7 @@ LL | extern "rust-intrinsic" fn baz() {}
    |        ^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0093]: unrecognized intrinsic function: `bar`
   --> $DIR/feature-gate-intrinsics.rs:2:5
diff --git a/tests/ui/feature-gates/feature-gate-is_sorted.stderr b/tests/ui/feature-gates/feature-gate-is_sorted.stderr
index ccac827076bc8..f3e87659b02f1 100644
--- a/tests/ui/feature-gates/feature-gate-is_sorted.stderr
+++ b/tests/ui/feature-gates/feature-gate-is_sorted.stderr
@@ -6,6 +6,7 @@ LL |     assert!([1, 2, 2, 9].iter().is_sorted());
    |
    = note: see issue #53485 <https://github.com/rust-lang/rust/issues/53485> for more information
    = help: add `#![feature(is_sorted)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'is_sorted': new API
   --> $DIR/feature-gate-is_sorted.rs:5:39
@@ -15,6 +16,7 @@ LL |     assert!(![-2i32, -1, 0, 3].iter().is_sorted_by_key(|n| n.abs()));
    |
    = note: see issue #53485 <https://github.com/rust-lang/rust/issues/53485> for more information
    = help: add `#![feature(is_sorted)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'is_sorted': new API
   --> $DIR/feature-gate-is_sorted.rs:9:26
@@ -24,6 +26,7 @@ LL |     assert!([1, 2, 2, 9].is_sorted());
    |
    = note: see issue #53485 <https://github.com/rust-lang/rust/issues/53485> for more information
    = help: add `#![feature(is_sorted)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'is_sorted': new API
   --> $DIR/feature-gate-is_sorted.rs:11:32
@@ -33,6 +36,7 @@ LL |     assert!(![-2i32, -1, 0, 3].is_sorted_by_key(|n| n.abs()));
    |
    = note: see issue #53485 <https://github.com/rust-lang/rust/issues/53485> for more information
    = help: add `#![feature(is_sorted)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 4 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-lang-items.stderr b/tests/ui/feature-gates/feature-gate-lang-items.stderr
index c2496863fea44..54787e03784e4 100644
--- a/tests/ui/feature-gates/feature-gate-lang-items.stderr
+++ b/tests/ui/feature-gates/feature-gate-lang-items.stderr
@@ -5,6 +5,7 @@ LL | #[lang = "foo"]
    | ^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(lang_items)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0522]: definition of an unknown language item: `foo`
   --> $DIR/feature-gate-lang-items.rs:1:1
diff --git a/tests/ui/feature-gates/feature-gate-large-assignments.stderr b/tests/ui/feature-gates/feature-gate-large-assignments.stderr
index c025be4f63652..7b0b4470c4e1e 100644
--- a/tests/ui/feature-gates/feature-gate-large-assignments.stderr
+++ b/tests/ui/feature-gates/feature-gate-large-assignments.stderr
@@ -6,6 +6,7 @@ LL | #![move_size_limit = "42"]
    |
    = note: see issue #83518 <https://github.com/rust-lang/rust/issues/83518> for more information
    = help: add `#![feature(large_assignments)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-link-arg-attribute.stderr b/tests/ui/feature-gates/feature-gate-link-arg-attribute.stderr
index 673835b8b9ebf..8cbad78478e18 100644
--- a/tests/ui/feature-gates/feature-gate-link-arg-attribute.stderr
+++ b/tests/ui/feature-gates/feature-gate-link-arg-attribute.stderr
@@ -6,6 +6,7 @@ LL | #[link(kind = "link-arg", name = "foo")]
    |
    = note: see issue #99427 <https://github.com/rust-lang/rust/issues/99427> for more information
    = help: add `#![feature(link_arg_attribute)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-link_cfg.stderr b/tests/ui/feature-gates/feature-gate-link_cfg.stderr
index 6e42be3954d1e..bfe7f74a92137 100644
--- a/tests/ui/feature-gates/feature-gate-link_cfg.stderr
+++ b/tests/ui/feature-gates/feature-gate-link_cfg.stderr
@@ -5,6 +5,7 @@ LL | #[link(name = "foo", cfg(foo))]
    |                      ^^^^^^^^
    |
    = help: add `#![feature(link_cfg)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-link_llvm_intrinsics.stderr b/tests/ui/feature-gates/feature-gate-link_llvm_intrinsics.stderr
index 0cad260a14a45..686007dcbb7ea 100644
--- a/tests/ui/feature-gates/feature-gate-link_llvm_intrinsics.stderr
+++ b/tests/ui/feature-gates/feature-gate-link_llvm_intrinsics.stderr
@@ -6,6 +6,7 @@ LL |     fn sqrt(x: f32) -> f32;
    |
    = note: see issue #29602 <https://github.com/rust-lang/rust/issues/29602> for more information
    = help: add `#![feature(link_llvm_intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-linkage.stderr b/tests/ui/feature-gates/feature-gate-linkage.stderr
index ca1f54145689c..2044b8a3c2470 100644
--- a/tests/ui/feature-gates/feature-gate-linkage.stderr
+++ b/tests/ui/feature-gates/feature-gate-linkage.stderr
@@ -6,6 +6,7 @@ LL |     #[linkage = "extern_weak"] static foo: *mut isize;
    |
    = note: see issue #29603 <https://github.com/rust-lang/rust/issues/29603> for more information
    = help: add `#![feature(linkage)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-lint-reasons.stderr b/tests/ui/feature-gates/feature-gate-lint-reasons.stderr
index 6d49b7ed2cd04..efcb3a10f32df 100644
--- a/tests/ui/feature-gates/feature-gate-lint-reasons.stderr
+++ b/tests/ui/feature-gates/feature-gate-lint-reasons.stderr
@@ -6,6 +6,7 @@ LL | #![warn(nonstandard_style, reason = "the standard should be respected")]
    |
    = note: see issue #54503 <https://github.com/rust-lang/rust/issues/54503> for more information
    = help: add `#![feature(lint_reasons)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: lint reasons are experimental
   --> $DIR/feature-gate-lint-reasons.rs:1:28
@@ -15,6 +16,7 @@ LL | #![warn(nonstandard_style, reason = "the standard should be respected")]
    |
    = note: see issue #54503 <https://github.com/rust-lang/rust/issues/54503> for more information
    = help: add `#![feature(lint_reasons)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error: aborting due to 2 previous errors
diff --git a/tests/ui/feature-gates/feature-gate-log_syntax.stderr b/tests/ui/feature-gates/feature-gate-log_syntax.stderr
index 500c752e20d07..0eba231a287e9 100644
--- a/tests/ui/feature-gates/feature-gate-log_syntax.stderr
+++ b/tests/ui/feature-gates/feature-gate-log_syntax.stderr
@@ -6,6 +6,7 @@ LL |     log_syntax!()
    |
    = note: see issue #29598 <https://github.com/rust-lang/rust/issues/29598> for more information
    = help: add `#![feature(log_syntax)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-log_syntax2.stderr b/tests/ui/feature-gates/feature-gate-log_syntax2.stderr
index a808a9463a046..e1f92dd60a3ca 100644
--- a/tests/ui/feature-gates/feature-gate-log_syntax2.stderr
+++ b/tests/ui/feature-gates/feature-gate-log_syntax2.stderr
@@ -6,6 +6,7 @@ LL |     println!("{:?}", log_syntax!());
    |
    = note: see issue #29598 <https://github.com/rust-lang/rust/issues/29598> for more information
    = help: add `#![feature(log_syntax)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-marker_trait_attr.stderr b/tests/ui/feature-gates/feature-gate-marker_trait_attr.stderr
index 4555ef1874f32..15888a38589cb 100644
--- a/tests/ui/feature-gates/feature-gate-marker_trait_attr.stderr
+++ b/tests/ui/feature-gates/feature-gate-marker_trait_attr.stderr
@@ -6,6 +6,7 @@ LL | #[marker] trait ExplicitMarker {}
    |
    = note: see issue #29864 <https://github.com/rust-lang/rust/issues/29864> for more information
    = help: add `#![feature(marker_trait_attr)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-may-dangle.stderr b/tests/ui/feature-gates/feature-gate-may-dangle.stderr
index c12b3ba517d10..67d00714d95c5 100644
--- a/tests/ui/feature-gates/feature-gate-may-dangle.stderr
+++ b/tests/ui/feature-gates/feature-gate-may-dangle.stderr
@@ -6,6 +6,7 @@ LL | unsafe impl<#[may_dangle] A> Drop for Pt<A> {
    |
    = note: see issue #34761 <https://github.com/rust-lang/rust/issues/34761> for more information
    = help: add `#![feature(dropck_eyepatch)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-more-qualified-paths.stderr b/tests/ui/feature-gates/feature-gate-more-qualified-paths.stderr
index 80ebcabcf8df8..e14ef828a57aa 100644
--- a/tests/ui/feature-gates/feature-gate-more-qualified-paths.stderr
+++ b/tests/ui/feature-gates/feature-gate-more-qualified-paths.stderr
@@ -6,6 +6,7 @@ LL |     let <Foo as A>::Assoc { br } = StructStruct { br: 2 };
    |
    = note: see issue #86935 <https://github.com/rust-lang/rust/issues/86935> for more information
    = help: add `#![feature(more_qualified_paths)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: usage of qualified paths in this context is experimental
   --> $DIR/feature-gate-more-qualified-paths.rs:5:13
@@ -15,6 +16,7 @@ LL |     let _ = <Foo as A>::Assoc { br: 2 };
    |
    = note: see issue #86935 <https://github.com/rust-lang/rust/issues/86935> for more information
    = help: add `#![feature(more_qualified_paths)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: usage of qualified paths in this context is experimental
   --> $DIR/feature-gate-more-qualified-paths.rs:7:9
@@ -24,6 +26,7 @@ LL |     let <E>::V(..) = E::V(0);
    |
    = note: see issue #86935 <https://github.com/rust-lang/rust/issues/86935> for more information
    = help: add `#![feature(more_qualified_paths)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-multiple_supertrait_upcastable.stderr b/tests/ui/feature-gates/feature-gate-multiple_supertrait_upcastable.stderr
index f6fcf4ee3ed0d..8a43d6159633a 100644
--- a/tests/ui/feature-gates/feature-gate-multiple_supertrait_upcastable.stderr
+++ b/tests/ui/feature-gates/feature-gate-multiple_supertrait_upcastable.stderr
@@ -6,6 +6,7 @@ LL | #![deny(multiple_supertrait_upcastable)]
    |
    = note: the `multiple_supertrait_upcastable` lint is unstable
    = help: add `#![feature(multiple_supertrait_upcastable)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: `#[warn(unknown_lints)]` on by default
 
 warning: unknown lint: `multiple_supertrait_upcastable`
@@ -16,6 +17,7 @@ LL | #![warn(multiple_supertrait_upcastable)]
    |
    = note: the `multiple_supertrait_upcastable` lint is unstable
    = help: add `#![feature(multiple_supertrait_upcastable)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 warning: 2 warnings emitted
 
diff --git a/tests/ui/feature-gates/feature-gate-naked_functions.stderr b/tests/ui/feature-gates/feature-gate-naked_functions.stderr
index dc6c9138c5d2d..e1b826582171f 100644
--- a/tests/ui/feature-gates/feature-gate-naked_functions.stderr
+++ b/tests/ui/feature-gates/feature-gate-naked_functions.stderr
@@ -6,6 +6,7 @@ LL | #[naked]
    |
    = note: see issue #90957 <https://github.com/rust-lang/rust/issues/90957> for more information
    = help: add `#![feature(naked_functions)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: the `#[naked]` attribute is an experimental feature
   --> $DIR/feature-gate-naked_functions.rs:11:1
@@ -15,6 +16,7 @@ LL | #[naked]
    |
    = note: see issue #90957 <https://github.com/rust-lang/rust/issues/90957> for more information
    = help: add `#![feature(naked_functions)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-native_link_modifiers_as_needed.stderr b/tests/ui/feature-gates/feature-gate-native_link_modifiers_as_needed.stderr
index 4c7ae9e2ef5e5..216477828e739 100644
--- a/tests/ui/feature-gates/feature-gate-native_link_modifiers_as_needed.stderr
+++ b/tests/ui/feature-gates/feature-gate-native_link_modifiers_as_needed.stderr
@@ -6,6 +6,7 @@ LL | #[link(name = "foo", kind = "dylib", modifiers = "+as-needed")]
    |
    = note: see issue #81490 <https://github.com/rust-lang/rust/issues/81490> for more information
    = help: add `#![feature(native_link_modifiers_as_needed)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-needs-allocator.stderr b/tests/ui/feature-gates/feature-gate-needs-allocator.stderr
index ca21f222588d0..f26243de25f38 100644
--- a/tests/ui/feature-gates/feature-gate-needs-allocator.stderr
+++ b/tests/ui/feature-gates/feature-gate-needs-allocator.stderr
@@ -5,6 +5,7 @@ LL | #![needs_allocator]
    | ^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(allocator_internals)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-never_patterns.stderr b/tests/ui/feature-gates/feature-gate-never_patterns.stderr
index dd10829d49594..1b5485d22fbf2 100644
--- a/tests/ui/feature-gates/feature-gate-never_patterns.stderr
+++ b/tests/ui/feature-gates/feature-gate-never_patterns.stderr
@@ -29,6 +29,7 @@ LL |     let (Ok(_x) | Err(&!)) = res.as_ref();
    |
    = note: see issue #118155 <https://github.com/rust-lang/rust/issues/118155> for more information
    = help: add `#![feature(never_patterns)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `!` patterns are experimental
   --> $DIR/feature-gate-never_patterns.rs:15:13
@@ -38,6 +39,7 @@ LL |             !
    |
    = note: see issue #118155 <https://github.com/rust-lang/rust/issues/118155> for more information
    = help: add `#![feature(never_patterns)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `!` patterns are experimental
   --> $DIR/feature-gate-never_patterns.rs:21:13
@@ -47,6 +49,7 @@ LL |             !
    |
    = note: see issue #118155 <https://github.com/rust-lang/rust/issues/118155> for more information
    = help: add `#![feature(never_patterns)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `!` patterns are experimental
   --> $DIR/feature-gate-never_patterns.rs:26:13
@@ -56,6 +59,7 @@ LL |             ! => {}
    |
    = note: see issue #118155 <https://github.com/rust-lang/rust/issues/118155> for more information
    = help: add `#![feature(never_patterns)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: `match` arm with no body
   --> $DIR/feature-gate-never_patterns.rs:39:9
@@ -83,6 +87,7 @@ LL |         Err(!),
    |
    = note: see issue #118155 <https://github.com/rust-lang/rust/issues/118155> for more information
    = help: add `#![feature(never_patterns)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `!` patterns are experimental
   --> $DIR/feature-gate-never_patterns.rs:55:13
@@ -92,6 +97,7 @@ LL |         Err(!) if false,
    |
    = note: see issue #118155 <https://github.com/rust-lang/rust/issues/118155> for more information
    = help: add `#![feature(never_patterns)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: `match` arm with no body
   --> $DIR/feature-gate-never_patterns.rs:65:9
diff --git a/tests/ui/feature-gates/feature-gate-never_type.stderr b/tests/ui/feature-gates/feature-gate-never_type.stderr
index 0a59cae9c8c46..0fca58519ce13 100644
--- a/tests/ui/feature-gates/feature-gate-never_type.stderr
+++ b/tests/ui/feature-gates/feature-gate-never_type.stderr
@@ -6,6 +6,7 @@ LL | type Ma = (u32, !, i32);
    |
    = note: see issue #35121 <https://github.com/rust-lang/rust/issues/35121> for more information
    = help: add `#![feature(never_type)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: the `!` type is experimental
   --> $DIR/feature-gate-never_type.rs:8:20
@@ -15,6 +16,7 @@ LL | type Meeshka = Vec<!>;
    |
    = note: see issue #35121 <https://github.com/rust-lang/rust/issues/35121> for more information
    = help: add `#![feature(never_type)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: the `!` type is experimental
   --> $DIR/feature-gate-never_type.rs:9:24
@@ -24,6 +26,7 @@ LL | type Mow = &'static fn(!) -> !;
    |
    = note: see issue #35121 <https://github.com/rust-lang/rust/issues/35121> for more information
    = help: add `#![feature(never_type)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: the `!` type is experimental
   --> $DIR/feature-gate-never_type.rs:10:27
@@ -33,6 +36,7 @@ LL | type Skwoz = &'static mut !;
    |
    = note: see issue #35121 <https://github.com/rust-lang/rust/issues/35121> for more information
    = help: add `#![feature(never_type)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: the `!` type is experimental
   --> $DIR/feature-gate-never_type.rs:13:16
@@ -42,6 +46,7 @@ LL |     type Wub = !;
    |
    = note: see issue #35121 <https://github.com/rust-lang/rust/issues/35121> for more information
    = help: add `#![feature(never_type)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 5 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-no_core.stderr b/tests/ui/feature-gates/feature-gate-no_core.stderr
index e525c95ac36ba..f5f04c346aef7 100644
--- a/tests/ui/feature-gates/feature-gate-no_core.stderr
+++ b/tests/ui/feature-gates/feature-gate-no_core.stderr
@@ -6,6 +6,7 @@ LL | #![no_core]
    |
    = note: see issue #29639 <https://github.com/rust-lang/rust/issues/29639> for more information
    = help: add `#![feature(no_core)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-no_sanitize.stderr b/tests/ui/feature-gates/feature-gate-no_sanitize.stderr
index bb808961eb217..a33bf6a9e40c1 100644
--- a/tests/ui/feature-gates/feature-gate-no_sanitize.stderr
+++ b/tests/ui/feature-gates/feature-gate-no_sanitize.stderr
@@ -6,6 +6,7 @@ LL | #[no_sanitize(address)]
    |
    = note: see issue #39699 <https://github.com/rust-lang/rust/issues/39699> for more information
    = help: add `#![feature(no_sanitize)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-non_exhaustive_omitted_patterns_lint.stderr b/tests/ui/feature-gates/feature-gate-non_exhaustive_omitted_patterns_lint.stderr
index 955d7fe3f3eaf..41764c8e018d3 100644
--- a/tests/ui/feature-gates/feature-gate-non_exhaustive_omitted_patterns_lint.stderr
+++ b/tests/ui/feature-gates/feature-gate-non_exhaustive_omitted_patterns_lint.stderr
@@ -7,6 +7,7 @@ LL | #![deny(non_exhaustive_omitted_patterns)]
    = note: the `non_exhaustive_omitted_patterns` lint is unstable
    = note: see issue #89554 <https://github.com/rust-lang/rust/issues/89554> for more information
    = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: `#[warn(unknown_lints)]` on by default
 
 warning: unknown lint: `non_exhaustive_omitted_patterns`
@@ -18,6 +19,7 @@ LL | #![allow(non_exhaustive_omitted_patterns)]
    = note: the `non_exhaustive_omitted_patterns` lint is unstable
    = note: see issue #89554 <https://github.com/rust-lang/rust/issues/89554> for more information
    = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 warning: unknown lint: `non_exhaustive_omitted_patterns`
   --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:15:5
@@ -28,6 +30,7 @@ LL |     #[allow(non_exhaustive_omitted_patterns)]
    = note: the `non_exhaustive_omitted_patterns` lint is unstable
    = note: see issue #89554 <https://github.com/rust-lang/rust/issues/89554> for more information
    = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 warning: unknown lint: `non_exhaustive_omitted_patterns`
   --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:15:5
@@ -38,6 +41,7 @@ LL |     #[allow(non_exhaustive_omitted_patterns)]
    = note: the `non_exhaustive_omitted_patterns` lint is unstable
    = note: see issue #89554 <https://github.com/rust-lang/rust/issues/89554> for more information
    = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 warning: unknown lint: `non_exhaustive_omitted_patterns`
@@ -49,6 +53,7 @@ LL |     #[warn(non_exhaustive_omitted_patterns)]
    = note: the `non_exhaustive_omitted_patterns` lint is unstable
    = note: see issue #89554 <https://github.com/rust-lang/rust/issues/89554> for more information
    = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 warning: unknown lint: `non_exhaustive_omitted_patterns`
   --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:24:5
@@ -59,6 +64,7 @@ LL |     #[warn(non_exhaustive_omitted_patterns)]
    = note: the `non_exhaustive_omitted_patterns` lint is unstable
    = note: see issue #89554 <https://github.com/rust-lang/rust/issues/89554> for more information
    = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 error[E0004]: non-exhaustive patterns: `Foo::C` not covered
diff --git a/tests/ui/feature-gates/feature-gate-non_lifetime_binders.stderr b/tests/ui/feature-gates/feature-gate-non_lifetime_binders.stderr
index f727fdae90ecd..6dbebc7cf3388 100644
--- a/tests/ui/feature-gates/feature-gate-non_lifetime_binders.stderr
+++ b/tests/ui/feature-gates/feature-gate-non_lifetime_binders.stderr
@@ -6,6 +6,7 @@ LL | fn foo() where for<T> T:, {}
    |
    = note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information
    = help: add `#![feature(non_lifetime_binders)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-offset-of-enum.stderr b/tests/ui/feature-gates/feature-gate-offset-of-enum.stderr
index 893f78702375c..02ee54e8607ac 100644
--- a/tests/ui/feature-gates/feature-gate-offset-of-enum.stderr
+++ b/tests/ui/feature-gates/feature-gate-offset-of-enum.stderr
@@ -15,6 +15,7 @@ LL |     offset_of!(Alpha, One);
    |
    = note: see issue #106655 <https://github.com/rust-lang/rust/issues/106655> for more information
    = help: add `#![feature(offset_of_enum)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0795]: `One` is an enum variant; expected field at end of `offset_of`
   --> $DIR/feature-gate-offset-of-enum.rs:12:23
@@ -30,6 +31,7 @@ LL |     offset_of!(Alpha, Two.0);
    |
    = note: see issue #106655 <https://github.com/rust-lang/rust/issues/106655> for more information
    = help: add `#![feature(offset_of_enum)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 4 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-omit-gdb-pretty-printer-section.stderr b/tests/ui/feature-gates/feature-gate-omit-gdb-pretty-printer-section.stderr
index 86f6040b14ff3..2e1d27fb7764d 100644
--- a/tests/ui/feature-gates/feature-gate-omit-gdb-pretty-printer-section.stderr
+++ b/tests/ui/feature-gates/feature-gate-omit-gdb-pretty-printer-section.stderr
@@ -5,6 +5,7 @@ LL | #[omit_gdb_pretty_printer_section]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(omit_gdb_pretty_printer_section)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-optimize_attribute.stderr b/tests/ui/feature-gates/feature-gate-optimize_attribute.stderr
index a3ced35155f37..815013733a98b 100644
--- a/tests/ui/feature-gates/feature-gate-optimize_attribute.stderr
+++ b/tests/ui/feature-gates/feature-gate-optimize_attribute.stderr
@@ -6,6 +6,7 @@ LL | #[optimize(size)]
    |
    = note: see issue #54882 <https://github.com/rust-lang/rust/issues/54882> for more information
    = help: add `#![feature(optimize_attribute)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: the `#[optimize]` attribute is an experimental feature
   --> $DIR/feature-gate-optimize_attribute.rs:10:1
@@ -15,6 +16,7 @@ LL | #[optimize(speed)]
    |
    = note: see issue #54882 <https://github.com/rust-lang/rust/issues/54882> for more information
    = help: add `#![feature(optimize_attribute)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: the `#[optimize]` attribute is an experimental feature
   --> $DIR/feature-gate-optimize_attribute.rs:13:1
@@ -24,6 +26,7 @@ LL | #[optimize(banana)]
    |
    = note: see issue #54882 <https://github.com/rust-lang/rust/issues/54882> for more information
    = help: add `#![feature(optimize_attribute)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: the `#[optimize]` attribute is an experimental feature
   --> $DIR/feature-gate-optimize_attribute.rs:4:1
@@ -33,6 +36,7 @@ LL | #[optimize(size)]
    |
    = note: see issue #54882 <https://github.com/rust-lang/rust/issues/54882> for more information
    = help: add `#![feature(optimize_attribute)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: the `#[optimize]` attribute is an experimental feature
   --> $DIR/feature-gate-optimize_attribute.rs:2:1
@@ -42,6 +46,7 @@ LL | #![optimize(speed)]
    |
    = note: see issue #54882 <https://github.com/rust-lang/rust/issues/54882> for more information
    = help: add `#![feature(optimize_attribute)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0722]: invalid argument
   --> $DIR/feature-gate-optimize_attribute.rs:13:12
diff --git a/tests/ui/feature-gates/feature-gate-prelude_import.stderr b/tests/ui/feature-gates/feature-gate-prelude_import.stderr
index b2e2a7c8cc114..3b22c65cd1fcd 100644
--- a/tests/ui/feature-gates/feature-gate-prelude_import.stderr
+++ b/tests/ui/feature-gates/feature-gate-prelude_import.stderr
@@ -5,6 +5,7 @@ LL | #[prelude_import]
    | ^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(prelude_import)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-proc_macro_byte_character.stderr b/tests/ui/feature-gates/feature-gate-proc_macro_byte_character.stderr
index f8fa8c54198b0..c14d19381c8bc 100644
--- a/tests/ui/feature-gates/feature-gate-proc_macro_byte_character.stderr
+++ b/tests/ui/feature-gates/feature-gate-proc_macro_byte_character.stderr
@@ -6,6 +6,7 @@ LL |     Literal::byte_character(b'a');
    |
    = note: see issue #115268 <https://github.com/rust-lang/rust/issues/115268> for more information
    = help: add `#![feature(proc_macro_byte_character)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-profiler-runtime.stderr b/tests/ui/feature-gates/feature-gate-profiler-runtime.stderr
index cc6506c5680e6..23792fb09baf7 100644
--- a/tests/ui/feature-gates/feature-gate-profiler-runtime.stderr
+++ b/tests/ui/feature-gates/feature-gate-profiler-runtime.stderr
@@ -5,6 +5,7 @@ LL | #![profiler_runtime]
    | ^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(profiler_runtime)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-register_tool.stderr b/tests/ui/feature-gates/feature-gate-register_tool.stderr
index d72249e02129b..a0db6ba744670 100644
--- a/tests/ui/feature-gates/feature-gate-register_tool.stderr
+++ b/tests/ui/feature-gates/feature-gate-register_tool.stderr
@@ -6,6 +6,7 @@ LL | #![register_tool(tool)]
    |
    = note: see issue #66079 <https://github.com/rust-lang/rust/issues/66079> for more information
    = help: add `#![feature(register_tool)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-repr-simd.stderr b/tests/ui/feature-gates/feature-gate-repr-simd.stderr
index 5b1270a19845f..5b490c0c0c33f 100644
--- a/tests/ui/feature-gates/feature-gate-repr-simd.stderr
+++ b/tests/ui/feature-gates/feature-gate-repr-simd.stderr
@@ -6,6 +6,7 @@ LL | #[repr(simd)]
    |
    = note: see issue #27731 <https://github.com/rust-lang/rust/issues/27731> for more information
    = help: add `#![feature(repr_simd)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: SIMD types are experimental and possibly buggy
   --> $DIR/feature-gate-repr-simd.rs:6:1
@@ -15,6 +16,7 @@ LL | #[repr(simd)]
    |
    = note: see issue #27731 <https://github.com/rust-lang/rust/issues/27731> for more information
    = help: add `#![feature(repr_simd)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0566]: conflicting representation hints
   --> $DIR/feature-gate-repr-simd.rs:4:8
diff --git a/tests/ui/feature-gates/feature-gate-repr128.stderr b/tests/ui/feature-gates/feature-gate-repr128.stderr
index 657802632b058..2607032447b39 100644
--- a/tests/ui/feature-gates/feature-gate-repr128.stderr
+++ b/tests/ui/feature-gates/feature-gate-repr128.stderr
@@ -6,6 +6,7 @@ LL | enum A {
    |
    = note: see issue #56071 <https://github.com/rust-lang/rust/issues/56071> for more information
    = help: add `#![feature(repr128)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-return_type_notation.cfg.stderr b/tests/ui/feature-gates/feature-gate-return_type_notation.cfg.stderr
index a15b01618f5b0..41bd66b13e70d 100644
--- a/tests/ui/feature-gates/feature-gate-return_type_notation.cfg.stderr
+++ b/tests/ui/feature-gates/feature-gate-return_type_notation.cfg.stderr
@@ -6,6 +6,7 @@ LL | fn foo<T: Trait<m(): Send>>() {}
    |
    = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
    = help: add `#![feature(return_type_notation)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: parenthesized generic arguments cannot be used in associated type constraints
   --> $DIR/feature-gate-return_type_notation.rs:14:17
diff --git a/tests/ui/feature-gates/feature-gate-return_type_notation.no.stderr b/tests/ui/feature-gates/feature-gate-return_type_notation.no.stderr
index dd6ebb6103862..79c626cef35dc 100644
--- a/tests/ui/feature-gates/feature-gate-return_type_notation.no.stderr
+++ b/tests/ui/feature-gates/feature-gate-return_type_notation.no.stderr
@@ -6,6 +6,7 @@ LL | fn foo<T: Trait<m(): Send>>() {}
    |
    = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
    = help: add `#![feature(return_type_notation)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = warning: unstable syntax can change at any point in the future, causing a hard error!
    = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
 
diff --git a/tests/ui/feature-gates/feature-gate-rust_cold_cc.stderr b/tests/ui/feature-gates/feature-gate-rust_cold_cc.stderr
index ab7e5f0366da5..eeff9534d528f 100644
--- a/tests/ui/feature-gates/feature-gate-rust_cold_cc.stderr
+++ b/tests/ui/feature-gates/feature-gate-rust_cold_cc.stderr
@@ -6,6 +6,7 @@ LL | extern "rust-cold" fn fu() {}
    |
    = note: see issue #97544 <https://github.com/rust-lang/rust/issues/97544> for more information
    = help: add `#![feature(rust_cold_cc)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: rust-cold is experimental and subject to change
   --> $DIR/feature-gate-rust_cold_cc.rs:6:12
@@ -15,6 +16,7 @@ LL |     extern "rust-cold" fn mu();
    |
    = note: see issue #97544 <https://github.com/rust-lang/rust/issues/97544> for more information
    = help: add `#![feature(rust_cold_cc)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: rust-cold is experimental and subject to change
   --> $DIR/feature-gate-rust_cold_cc.rs:7:12
@@ -24,6 +26,7 @@ LL |     extern "rust-cold" fn dmu() {}
    |
    = note: see issue #97544 <https://github.com/rust-lang/rust/issues/97544> for more information
    = help: add `#![feature(rust_cold_cc)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: rust-cold is experimental and subject to change
   --> $DIR/feature-gate-rust_cold_cc.rs:12:12
@@ -33,6 +36,7 @@ LL |     extern "rust-cold" fn mu() {}
    |
    = note: see issue #97544 <https://github.com/rust-lang/rust/issues/97544> for more information
    = help: add `#![feature(rust_cold_cc)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: rust-cold is experimental and subject to change
   --> $DIR/feature-gate-rust_cold_cc.rs:16:12
@@ -42,6 +46,7 @@ LL |     extern "rust-cold" fn imu() {}
    |
    = note: see issue #97544 <https://github.com/rust-lang/rust/issues/97544> for more information
    = help: add `#![feature(rust_cold_cc)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: rust-cold is experimental and subject to change
   --> $DIR/feature-gate-rust_cold_cc.rs:19:19
@@ -51,6 +56,7 @@ LL | type TAU = extern "rust-cold" fn();
    |
    = note: see issue #97544 <https://github.com/rust-lang/rust/issues/97544> for more information
    = help: add `#![feature(rust_cold_cc)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: rust-cold is experimental and subject to change
   --> $DIR/feature-gate-rust_cold_cc.rs:21:8
@@ -60,6 +66,7 @@ LL | extern "rust-cold" {}
    |
    = note: see issue #97544 <https://github.com/rust-lang/rust/issues/97544> for more information
    = help: add `#![feature(rust_cold_cc)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 7 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-rustc-allow-const-fn-unstable.stderr b/tests/ui/feature-gates/feature-gate-rustc-allow-const-fn-unstable.stderr
index b33721ca43d9d..44f7a4bb0e688 100644
--- a/tests/ui/feature-gates/feature-gate-rustc-allow-const-fn-unstable.stderr
+++ b/tests/ui/feature-gates/feature-gate-rustc-allow-const-fn-unstable.stderr
@@ -6,6 +6,7 @@ LL | #[rustc_allow_const_fn_unstable()]
    |
    = note: see issue #69399 <https://github.com/rust-lang/rust/issues/69399> for more information
    = help: add `#![feature(rustc_allow_const_fn_unstable)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-rustc-attrs-1.stderr b/tests/ui/feature-gates/feature-gate-rustc-attrs-1.stderr
index 45a095903d2a7..8177d5ef6bedb 100644
--- a/tests/ui/feature-gates/feature-gate-rustc-attrs-1.stderr
+++ b/tests/ui/feature-gates/feature-gate-rustc-attrs-1.stderr
@@ -5,6 +5,7 @@ LL | #[rustc_variance]
    | ^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: the `#[rustc_error]` attribute is just used for rustc unit tests and will never be stable
   --> $DIR/feature-gate-rustc-attrs-1.rs:4:1
@@ -13,6 +14,7 @@ LL | #[rustc_error]
    | ^^^^^^^^^^^^^^
    |
    = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: the `#[rustc_nonnull_optimization_guaranteed]` attribute is just used to enable niche optimizations in libcore and libstd and will never be stable
   --> $DIR/feature-gate-rustc-attrs-1.rs:5:1
@@ -21,6 +23,7 @@ LL | #[rustc_nonnull_optimization_guaranteed]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-rustc-attrs.stderr b/tests/ui/feature-gates/feature-gate-rustc-attrs.stderr
index 1517a7a5c731a..c7a5ef3e44be7 100644
--- a/tests/ui/feature-gates/feature-gate-rustc-attrs.stderr
+++ b/tests/ui/feature-gates/feature-gate-rustc-attrs.stderr
@@ -41,6 +41,7 @@ LL | #[rustc_dummy]
    | ^^^^^^^^^^^^^^
    |
    = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 7 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-rustdoc_internals.stderr b/tests/ui/feature-gates/feature-gate-rustdoc_internals.stderr
index c4272a2c04c2a..bbb9edd58f096 100644
--- a/tests/ui/feature-gates/feature-gate-rustdoc_internals.stderr
+++ b/tests/ui/feature-gates/feature-gate-rustdoc_internals.stderr
@@ -6,6 +6,7 @@ LL | #[doc(keyword = "match")]
    |
    = note: see issue #90418 <https://github.com/rust-lang/rust/issues/90418> for more information
    = help: add `#![feature(rustdoc_internals)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `#[doc(fake_variadic)]` is meant for internal use only
   --> $DIR/feature-gate-rustdoc_internals.rs:7:1
@@ -15,6 +16,7 @@ LL | #[doc(fake_variadic)]
    |
    = note: see issue #90418 <https://github.com/rust-lang/rust/issues/90418> for more information
    = help: add `#![feature(rustdoc_internals)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-simd.stderr b/tests/ui/feature-gates/feature-gate-simd.stderr
index fa30d461f9c13..b020db35a51ca 100644
--- a/tests/ui/feature-gates/feature-gate-simd.stderr
+++ b/tests/ui/feature-gates/feature-gate-simd.stderr
@@ -6,6 +6,7 @@ LL | #[repr(simd)]
    |
    = note: see issue #27731 <https://github.com/rust-lang/rust/issues/27731> for more information
    = help: add `#![feature(repr_simd)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-start.stderr b/tests/ui/feature-gates/feature-gate-start.stderr
index 157bf18c9e87a..b1859c43718c8 100644
--- a/tests/ui/feature-gates/feature-gate-start.stderr
+++ b/tests/ui/feature-gates/feature-gate-start.stderr
@@ -6,6 +6,7 @@ LL | fn foo(_: isize, _: *const *const u8) -> isize { 0 }
    |
    = note: see issue #29633 <https://github.com/rust-lang/rust/issues/29633> for more information
    = help: add `#![feature(start)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-stmt_expr_attributes.stderr b/tests/ui/feature-gates/feature-gate-stmt_expr_attributes.stderr
index 4ff85dc0797ec..67fdae030c04e 100644
--- a/tests/ui/feature-gates/feature-gate-stmt_expr_attributes.stderr
+++ b/tests/ui/feature-gates/feature-gate-stmt_expr_attributes.stderr
@@ -6,6 +6,7 @@ LL | const X: i32 = #[allow(dead_code)] 8;
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-strict_provenance.stderr b/tests/ui/feature-gates/feature-gate-strict_provenance.stderr
index 36224ee864b34..82078d576ad68 100644
--- a/tests/ui/feature-gates/feature-gate-strict_provenance.stderr
+++ b/tests/ui/feature-gates/feature-gate-strict_provenance.stderr
@@ -7,6 +7,7 @@ LL | #![deny(fuzzy_provenance_casts)]
    = note: the `fuzzy_provenance_casts` lint is unstable
    = note: see issue #95228 <https://github.com/rust-lang/rust/issues/95228> for more information
    = help: add `#![feature(strict_provenance)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: `#[warn(unknown_lints)]` on by default
 
 warning: unknown lint: `lossy_provenance_casts`
@@ -18,6 +19,7 @@ LL | #![deny(lossy_provenance_casts)]
    = note: the `lossy_provenance_casts` lint is unstable
    = note: see issue #95228 <https://github.com/rust-lang/rust/issues/95228> for more information
    = help: add `#![feature(strict_provenance)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 warning: 2 warnings emitted
 
diff --git a/tests/ui/feature-gates/feature-gate-test_unstable_lint.stderr b/tests/ui/feature-gates/feature-gate-test_unstable_lint.stderr
index aec32ac4abb2e..5dc303da74205 100644
--- a/tests/ui/feature-gates/feature-gate-test_unstable_lint.stderr
+++ b/tests/ui/feature-gates/feature-gate-test_unstable_lint.stderr
@@ -6,6 +6,7 @@ LL | #![allow(test_unstable_lint)]
    |
    = note: the `test_unstable_lint` lint is unstable
    = help: add `#![feature(test_unstable_lint)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: `#[warn(unknown_lints)]` on by default
 
 warning: 1 warning emitted
diff --git a/tests/ui/feature-gates/feature-gate-thread_local.stderr b/tests/ui/feature-gates/feature-gate-thread_local.stderr
index 8fbbfb59a4829..de6debafb9d02 100644
--- a/tests/ui/feature-gates/feature-gate-thread_local.stderr
+++ b/tests/ui/feature-gates/feature-gate-thread_local.stderr
@@ -6,6 +6,7 @@ LL | #[thread_local]
    |
    = note: see issue #29594 <https://github.com/rust-lang/rust/issues/29594> for more information
    = help: add `#![feature(thread_local)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-trace_macros.stderr b/tests/ui/feature-gates/feature-gate-trace_macros.stderr
index 305186e51173c..68d3f75e99594 100644
--- a/tests/ui/feature-gates/feature-gate-trace_macros.stderr
+++ b/tests/ui/feature-gates/feature-gate-trace_macros.stderr
@@ -6,6 +6,7 @@ LL |     trace_macros!(true);
    |
    = note: see issue #29598 <https://github.com/rust-lang/rust/issues/29598> for more information
    = help: add `#![feature(trace_macros)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-trait-alias.stderr b/tests/ui/feature-gates/feature-gate-trait-alias.stderr
index 919a97673fb0c..175c16cf3669e 100644
--- a/tests/ui/feature-gates/feature-gate-trait-alias.stderr
+++ b/tests/ui/feature-gates/feature-gate-trait-alias.stderr
@@ -6,6 +6,7 @@ LL | trait Foo = Default;
    |
    = note: see issue #41517 <https://github.com/rust-lang/rust/issues/41517> for more information
    = help: add `#![feature(trait_alias)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-transparent_unions.stderr b/tests/ui/feature-gates/feature-gate-transparent_unions.stderr
index 13ea3603a8dab..fc1dc12c5714d 100644
--- a/tests/ui/feature-gates/feature-gate-transparent_unions.stderr
+++ b/tests/ui/feature-gates/feature-gate-transparent_unions.stderr
@@ -6,6 +6,7 @@ LL | union OkButUnstableUnion {
    |
    = note: see issue #60405 <https://github.com/rust-lang/rust/issues/60405> for more information
    = help: add `#![feature(transparent_unions)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-try_blocks.stderr b/tests/ui/feature-gates/feature-gate-try_blocks.stderr
index 028dff34c9d38..dbef7fbe9d25e 100644
--- a/tests/ui/feature-gates/feature-gate-try_blocks.stderr
+++ b/tests/ui/feature-gates/feature-gate-try_blocks.stderr
@@ -10,6 +10,7 @@ LL | |     };
    |
    = note: see issue #31436 <https://github.com/rust-lang/rust/issues/31436> for more information
    = help: add `#![feature(try_blocks)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-type_ascription.stderr b/tests/ui/feature-gates/feature-gate-type_ascription.stderr
index 2c78e4e38320c..88da58d07e1a1 100644
--- a/tests/ui/feature-gates/feature-gate-type_ascription.stderr
+++ b/tests/ui/feature-gates/feature-gate-type_ascription.stderr
@@ -6,6 +6,7 @@ LL |     let a = type_ascribe!(10, u8);
    |
    = note: see issue #23416 <https://github.com/rust-lang/rust/issues/23416> for more information
    = help: add `#![feature(type_ascription)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-type_privacy_lints.stderr b/tests/ui/feature-gates/feature-gate-type_privacy_lints.stderr
index 5cc30de9c578c..72ac3792fff50 100644
--- a/tests/ui/feature-gates/feature-gate-type_privacy_lints.stderr
+++ b/tests/ui/feature-gates/feature-gate-type_privacy_lints.stderr
@@ -7,6 +7,7 @@ LL | #![warn(unnameable_types)]
    = note: the `unnameable_types` lint is unstable
    = note: see issue #48054 <https://github.com/rust-lang/rust/issues/48054> for more information
    = help: add `#![feature(type_privacy_lints)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: `#[warn(unknown_lints)]` on by default
 
 warning: 1 warning emitted
diff --git a/tests/ui/feature-gates/feature-gate-unboxed-closures-manual-impls.stderr b/tests/ui/feature-gates/feature-gate-unboxed-closures-manual-impls.stderr
index b417dfb506ada..5d598ec2969fc 100644
--- a/tests/ui/feature-gates/feature-gate-unboxed-closures-manual-impls.stderr
+++ b/tests/ui/feature-gates/feature-gate-unboxed-closures-manual-impls.stderr
@@ -6,6 +6,7 @@ LL |     extern "rust-call" fn call(self, args: ()) -> () {}
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: rust-call ABI is subject to change
   --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:22:12
@@ -15,6 +16,7 @@ LL |     extern "rust-call" fn call_once(self, args: ()) -> () {}
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: rust-call ABI is subject to change
   --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:30:12
@@ -24,6 +26,7 @@ LL |     extern "rust-call" fn call_mut(&self, args: ()) -> () {}
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: rust-call ABI is subject to change
   --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:39:12
@@ -33,6 +36,7 @@ LL |     extern "rust-call" fn call_once(&self, args: ()) -> () {}
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change
   --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:9:6
@@ -42,6 +46,7 @@ LL | impl Fn<()> for Foo {
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0183]: manual implementations of `Fn` are experimental
   --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:9:6
@@ -79,6 +84,7 @@ LL | impl FnMut<()> for Bar {
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0183]: manual implementations of `FnMut` are experimental
   --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:26:6
@@ -96,6 +102,7 @@ LL | impl FnOnce<()> for Baz {
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0183]: manual implementations of `FnOnce` are experimental
   --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:35:6
diff --git a/tests/ui/feature-gates/feature-gate-unboxed-closures-method-calls.stderr b/tests/ui/feature-gates/feature-gate-unboxed-closures-method-calls.stderr
index c61382c64f5c0..0ef732d391b7b 100644
--- a/tests/ui/feature-gates/feature-gate-unboxed-closures-method-calls.stderr
+++ b/tests/ui/feature-gates/feature-gate-unboxed-closures-method-calls.stderr
@@ -6,6 +6,7 @@ LL |     f.call(());
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(fn_traits)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'fn_traits'
   --> $DIR/feature-gate-unboxed-closures-method-calls.rs:5:7
@@ -15,6 +16,7 @@ LL |     f.call_mut(());
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(fn_traits)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'fn_traits'
   --> $DIR/feature-gate-unboxed-closures-method-calls.rs:6:7
@@ -24,6 +26,7 @@ LL |     f.call_once(());
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(fn_traits)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-unboxed-closures-ufcs-calls.stderr b/tests/ui/feature-gates/feature-gate-unboxed-closures-ufcs-calls.stderr
index 50eaeecde3d29..f4d75fc6a8644 100644
--- a/tests/ui/feature-gates/feature-gate-unboxed-closures-ufcs-calls.stderr
+++ b/tests/ui/feature-gates/feature-gate-unboxed-closures-ufcs-calls.stderr
@@ -6,6 +6,7 @@ LL |     Fn::call(&f, ());
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(fn_traits)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'fn_traits'
   --> $DIR/feature-gate-unboxed-closures-ufcs-calls.rs:5:5
@@ -15,6 +16,7 @@ LL |     FnMut::call_mut(&mut f, ());
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(fn_traits)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'fn_traits'
   --> $DIR/feature-gate-unboxed-closures-ufcs-calls.rs:6:5
@@ -24,6 +26,7 @@ LL |     FnOnce::call_once(f, ());
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(fn_traits)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-unboxed-closures.stderr b/tests/ui/feature-gates/feature-gate-unboxed-closures.stderr
index a763c28de602b..52c18ec34c564 100644
--- a/tests/ui/feature-gates/feature-gate-unboxed-closures.stderr
+++ b/tests/ui/feature-gates/feature-gate-unboxed-closures.stderr
@@ -6,6 +6,7 @@ LL |     extern "rust-call" fn call_once(self, (a, b): (u32, u32)) -> u32 {
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change
   --> $DIR/feature-gate-unboxed-closures.rs:5:6
@@ -15,6 +16,7 @@ LL | impl FnOnce<(u32, u32)> for Test {
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0183]: manual implementations of `FnOnce` are experimental
   --> $DIR/feature-gate-unboxed-closures.rs:5:6
diff --git a/tests/ui/feature-gates/feature-gate-unix_sigpipe.stderr b/tests/ui/feature-gates/feature-gate-unix_sigpipe.stderr
index 6fbade424b8e2..88c18e726835e 100644
--- a/tests/ui/feature-gates/feature-gate-unix_sigpipe.stderr
+++ b/tests/ui/feature-gates/feature-gate-unix_sigpipe.stderr
@@ -6,6 +6,7 @@ LL | #[unix_sigpipe = "inherit"]
    |
    = note: see issue #97889 <https://github.com/rust-lang/rust/issues/97889> for more information
    = help: add `#![feature(unix_sigpipe)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-unnamed_fields.stderr b/tests/ui/feature-gates/feature-gate-unnamed_fields.stderr
index f026f2c3600b3..82f08912bc843 100644
--- a/tests/ui/feature-gates/feature-gate-unnamed_fields.stderr
+++ b/tests/ui/feature-gates/feature-gate-unnamed_fields.stderr
@@ -6,6 +6,7 @@ LL |     _: union {
    |
    = note: see issue #49804 <https://github.com/rust-lang/rust/issues/49804> for more information
    = help: add `#![feature(unnamed_fields)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: unnamed fields are not yet fully implemented
   --> $DIR/feature-gate-unnamed_fields.rs:3:8
@@ -21,6 +22,7 @@ LL | |     }
    |
    = note: see issue #49804 <https://github.com/rust-lang/rust/issues/49804> for more information
    = help: add `#![feature(unnamed_fields)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: unnamed fields are not yet fully implemented
   --> $DIR/feature-gate-unnamed_fields.rs:13:5
@@ -30,6 +32,7 @@ LL |     _: struct {
    |
    = note: see issue #49804 <https://github.com/rust-lang/rust/issues/49804> for more information
    = help: add `#![feature(unnamed_fields)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: unnamed fields are not yet fully implemented
   --> $DIR/feature-gate-unnamed_fields.rs:13:8
@@ -45,6 +48,7 @@ LL | |     }
    |
    = note: see issue #49804 <https://github.com/rust-lang/rust/issues/49804> for more information
    = help: add `#![feature(unnamed_fields)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: unnamed fields are not yet fully implemented
   --> $DIR/feature-gate-unnamed_fields.rs:23:5
@@ -54,6 +58,7 @@ LL |     _: S
    |
    = note: see issue #49804 <https://github.com/rust-lang/rust/issues/49804> for more information
    = help: add `#![feature(unnamed_fields)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: anonymous unions are unimplemented
   --> $DIR/feature-gate-unnamed_fields.rs:3:8
diff --git a/tests/ui/feature-gates/feature-gate-unsized_tuple_coercion.stderr b/tests/ui/feature-gates/feature-gate-unsized_tuple_coercion.stderr
index dd5a1cd89e7f2..251928658df2f 100644
--- a/tests/ui/feature-gates/feature-gate-unsized_tuple_coercion.stderr
+++ b/tests/ui/feature-gates/feature-gate-unsized_tuple_coercion.stderr
@@ -6,6 +6,7 @@ LL |     let _ : &(dyn Send,) = &((),);
    |
    = note: see issue #42877 <https://github.com/rust-lang/rust/issues/42877> for more information
    = help: add `#![feature(unsized_tuple_coercion)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-used_with_arg.stderr b/tests/ui/feature-gates/feature-gate-used_with_arg.stderr
index d115bf4e365a7..6288715604f7f 100644
--- a/tests/ui/feature-gates/feature-gate-used_with_arg.stderr
+++ b/tests/ui/feature-gates/feature-gate-used_with_arg.stderr
@@ -6,6 +6,7 @@ LL | #[used(linker)]
    |
    = note: see issue #93798 <https://github.com/rust-lang/rust/issues/93798> for more information
    = help: add `#![feature(used_with_arg)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `#[used(compiler)]` is currently unstable
   --> $DIR/feature-gate-used_with_arg.rs:4:1
@@ -15,6 +16,7 @@ LL | #[used(compiler)]
    |
    = note: see issue #93798 <https://github.com/rust-lang/rust/issues/93798> for more information
    = help: add `#![feature(used_with_arg)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-vectorcall.stderr b/tests/ui/feature-gates/feature-gate-vectorcall.stderr
index 55ee76ec3f1bb..df93e8812c1ec 100644
--- a/tests/ui/feature-gates/feature-gate-vectorcall.stderr
+++ b/tests/ui/feature-gates/feature-gate-vectorcall.stderr
@@ -5,6 +5,7 @@ LL | extern "vectorcall" fn f() {}
    |        ^^^^^^^^^^^^
    |
    = help: add `#![feature(abi_vectorcall)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: vectorcall is experimental and subject to change
   --> $DIR/feature-gate-vectorcall.rs:15:12
@@ -13,6 +14,7 @@ LL |     extern "vectorcall" fn m();
    |            ^^^^^^^^^^^^
    |
    = help: add `#![feature(abi_vectorcall)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: vectorcall is experimental and subject to change
   --> $DIR/feature-gate-vectorcall.rs:17:12
@@ -21,6 +23,7 @@ LL |     extern "vectorcall" fn dm() {}
    |            ^^^^^^^^^^^^
    |
    = help: add `#![feature(abi_vectorcall)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: vectorcall is experimental and subject to change
   --> $DIR/feature-gate-vectorcall.rs:22:12
@@ -29,6 +32,7 @@ LL |     extern "vectorcall" fn m() {}
    |            ^^^^^^^^^^^^
    |
    = help: add `#![feature(abi_vectorcall)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: vectorcall is experimental and subject to change
   --> $DIR/feature-gate-vectorcall.rs:26:12
@@ -37,6 +41,7 @@ LL |     extern "vectorcall" fn im() {}
    |            ^^^^^^^^^^^^
    |
    = help: add `#![feature(abi_vectorcall)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: vectorcall is experimental and subject to change
   --> $DIR/feature-gate-vectorcall.rs:29:18
@@ -45,6 +50,7 @@ LL | type TA = extern "vectorcall" fn();
    |                  ^^^^^^^^^^^^
    |
    = help: add `#![feature(abi_vectorcall)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: vectorcall is experimental and subject to change
   --> $DIR/feature-gate-vectorcall.rs:31:8
@@ -53,6 +59,7 @@ LL | extern "vectorcall" {}
    |        ^^^^^^^^^^^^
    |
    = help: add `#![feature(abi_vectorcall)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 7 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-wasm_abi.stderr b/tests/ui/feature-gates/feature-gate-wasm_abi.stderr
index 0140002e350a3..973c42af19c58 100644
--- a/tests/ui/feature-gates/feature-gate-wasm_abi.stderr
+++ b/tests/ui/feature-gates/feature-gate-wasm_abi.stderr
@@ -6,6 +6,7 @@ LL | extern "wasm" fn fu() {}
    |
    = note: see issue #83788 <https://github.com/rust-lang/rust/issues/83788> for more information
    = help: add `#![feature(wasm_abi)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: wasm ABI is experimental and subject to change
   --> $DIR/feature-gate-wasm_abi.rs:11:12
@@ -15,6 +16,7 @@ LL |     extern "wasm" fn mu();
    |
    = note: see issue #83788 <https://github.com/rust-lang/rust/issues/83788> for more information
    = help: add `#![feature(wasm_abi)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: wasm ABI is experimental and subject to change
   --> $DIR/feature-gate-wasm_abi.rs:12:12
@@ -24,6 +26,7 @@ LL |     extern "wasm" fn dmu() {}
    |
    = note: see issue #83788 <https://github.com/rust-lang/rust/issues/83788> for more information
    = help: add `#![feature(wasm_abi)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: wasm ABI is experimental and subject to change
   --> $DIR/feature-gate-wasm_abi.rs:17:12
@@ -33,6 +36,7 @@ LL |     extern "wasm" fn mu() {}
    |
    = note: see issue #83788 <https://github.com/rust-lang/rust/issues/83788> for more information
    = help: add `#![feature(wasm_abi)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: wasm ABI is experimental and subject to change
   --> $DIR/feature-gate-wasm_abi.rs:21:12
@@ -42,6 +46,7 @@ LL |     extern "wasm" fn imu() {}
    |
    = note: see issue #83788 <https://github.com/rust-lang/rust/issues/83788> for more information
    = help: add `#![feature(wasm_abi)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: wasm ABI is experimental and subject to change
   --> $DIR/feature-gate-wasm_abi.rs:24:19
@@ -51,6 +56,7 @@ LL | type TAU = extern "wasm" fn();
    |
    = note: see issue #83788 <https://github.com/rust-lang/rust/issues/83788> for more information
    = help: add `#![feature(wasm_abi)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: wasm ABI is experimental and subject to change
   --> $DIR/feature-gate-wasm_abi.rs:26:8
@@ -60,6 +66,7 @@ LL | extern "wasm" {}
    |
    = note: see issue #83788 <https://github.com/rust-lang/rust/issues/83788> for more information
    = help: add `#![feature(wasm_abi)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 7 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-yeet_expr-in-cfg.stderr b/tests/ui/feature-gates/feature-gate-yeet_expr-in-cfg.stderr
index f90c379bdafe3..890517b2506f9 100644
--- a/tests/ui/feature-gates/feature-gate-yeet_expr-in-cfg.stderr
+++ b/tests/ui/feature-gates/feature-gate-yeet_expr-in-cfg.stderr
@@ -6,6 +6,7 @@ LL |         do yeet
    |
    = note: see issue #96373 <https://github.com/rust-lang/rust/issues/96373> for more information
    = help: add `#![feature(yeet_expr)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `do yeet` expression is experimental
   --> $DIR/feature-gate-yeet_expr-in-cfg.rs:14:5
@@ -15,6 +16,7 @@ LL |     do yeet "hello";
    |
    = note: see issue #96373 <https://github.com/rust-lang/rust/issues/96373> for more information
    = help: add `#![feature(yeet_expr)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gate-yeet_expr.stderr b/tests/ui/feature-gates/feature-gate-yeet_expr.stderr
index 8d1b92370fbe2..4c576714357eb 100644
--- a/tests/ui/feature-gates/feature-gate-yeet_expr.stderr
+++ b/tests/ui/feature-gates/feature-gate-yeet_expr.stderr
@@ -6,6 +6,7 @@ LL |     do yeet
    |
    = note: see issue #96373 <https://github.com/rust-lang/rust/issues/96373> for more information
    = help: add `#![feature(yeet_expr)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `do yeet` expression is experimental
   --> $DIR/feature-gate-yeet_expr.rs:8:5
@@ -15,6 +16,7 @@ LL |     do yeet "hello";
    |
    = note: see issue #96373 <https://github.com/rust-lang/rust/issues/96373> for more information
    = help: add `#![feature(yeet_expr)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/feature-gates/feature-gated-feature-in-macro-arg.stderr b/tests/ui/feature-gates/feature-gated-feature-in-macro-arg.stderr
index 0053d9d5cff8d..b0ed6e6076051 100644
--- a/tests/ui/feature-gates/feature-gated-feature-in-macro-arg.stderr
+++ b/tests/ui/feature-gates/feature-gated-feature-in-macro-arg.stderr
@@ -5,6 +5,7 @@ LL |         extern "rust-intrinsic" {
    |                ^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/issue-43106-gating-of-builtin-attrs-error.rs b/tests/ui/feature-gates/issue-43106-gating-of-builtin-attrs-error.rs
index 0f833f793bd85..bd3b69c2b4a6a 100644
--- a/tests/ui/feature-gates/issue-43106-gating-of-builtin-attrs-error.rs
+++ b/tests/ui/feature-gates/issue-43106-gating-of-builtin-attrs-error.rs
@@ -13,6 +13,7 @@
 //~^ ERROR: `macro_export` attribute cannot be used at crate level
 #![rustc_main] //~ ERROR: the `#[rustc_main]` attribute is used internally to specify
 //~^ ERROR: `rustc_main` attribute cannot be used at crate level
+//~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 #![start]
 //~^ ERROR: `start` attribute cannot be used at crate level
 #![repr()]
diff --git a/tests/ui/feature-gates/issue-43106-gating-of-builtin-attrs-error.stderr b/tests/ui/feature-gates/issue-43106-gating-of-builtin-attrs-error.stderr
index f01153dcb96c0..89fa2abffc2fc 100644
--- a/tests/ui/feature-gates/issue-43106-gating-of-builtin-attrs-error.stderr
+++ b/tests/ui/feature-gates/issue-43106-gating-of-builtin-attrs-error.stderr
@@ -5,9 +5,10 @@ LL | #![rustc_main]
    | ^^^^^^^^^^^^^^
    |
    = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: attribute must be of the form `#[inline]` or `#[inline(always|never)]`
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:46:5
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:47:5
    |
 LL |     #[inline = "2100"] fn f() { }
    |     ^^^^^^^^^^^^^^^^^^
@@ -17,37 +18,37 @@ LL |     #[inline = "2100"] fn f() { }
    = note: `#[deny(ill_formed_attribute_input)]` on by default
 
 error: `start` attribute can only be used on functions
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:125:1
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:126:1
    |
 LL | #[start]
    | ^^^^^^^^
 
 error: `start` attribute can only be used on functions
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:128:17
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:129:17
    |
 LL |     mod inner { #![start] }
    |                 ^^^^^^^^^
 
 error: `start` attribute can only be used on functions
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:133:5
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:134:5
    |
 LL |     #[start] struct S;
    |     ^^^^^^^^
 
 error: `start` attribute can only be used on functions
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:136:5
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:137:5
    |
 LL |     #[start] type T = S;
    |     ^^^^^^^^
 
 error: `start` attribute can only be used on functions
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:139:5
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:140:5
    |
 LL |     #[start] impl S { }
    |     ^^^^^^^^
 
 error[E0518]: attribute should be applied to function or closure
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:31:1
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:32:1
    |
 LL |   #[inline]
    |   ^^^^^^^^^
@@ -62,7 +63,7 @@ LL | | }
    | |_- not a function or closure
 
 error: attribute should be applied to an `extern crate` item
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:65:1
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:66:1
    |
 LL |   #[no_link]
    |   ^^^^^^^^^^
@@ -77,7 +78,7 @@ LL | | }
    | |_- not an `extern crate` item
 
 error: attribute should be applied to a free function, impl method or static
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:91:1
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:92:1
    |
 LL |   #[export_name = "2200"]
    |   ^^^^^^^^^^^^^^^^^^^^^^^
@@ -92,7 +93,7 @@ LL | | }
    | |_- not a free function, impl method or static
 
 error[E0517]: attribute should be applied to a struct, enum, or union
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:143:8
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:144:8
    |
 LL |   #[repr(C)]
    |          ^
@@ -107,19 +108,19 @@ LL | | }
    | |_- not a struct, enum, or union
 
 error: attribute should be applied to an `extern crate` item
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:25:1
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:26:1
    |
 LL | #![no_link]
    | ^^^^^^^^^^^ not an `extern crate` item
 
 error: attribute should be applied to a free function, impl method or static
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:27:1
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:28:1
    |
 LL | #![export_name = "2200"]
    | ^^^^^^^^^^^^^^^^^^^^^^^^ not a free function, impl method or static
 
 error[E0518]: attribute should be applied to function or closure
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:29:1
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:30:1
    |
 LL | #![inline]
    | ^^^^^^^^^^ not a function or closure
@@ -155,7 +156,7 @@ LL + #[rustc_main]
    |
 
 error: `start` attribute cannot be used at crate level
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:16:1
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:17:1
    |
 LL | #![start]
    | ^^^^^^^^^
@@ -170,7 +171,7 @@ LL + #[start]
    |
 
 error: `repr` attribute cannot be used at crate level
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:18:1
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:19:1
    |
 LL | #![repr()]
    | ^^^^^^^^^^
@@ -185,7 +186,7 @@ LL + #[repr()]
    |
 
 error: `path` attribute cannot be used at crate level
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:20:1
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:21:1
    |
 LL | #![path = "3800"]
    | ^^^^^^^^^^^^^^^^^
@@ -200,7 +201,7 @@ LL + #[path = "3800"]
    |
 
 error: `automatically_derived` attribute cannot be used at crate level
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:22:1
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:23:1
    |
 LL | #![automatically_derived]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -215,115 +216,115 @@ LL + #[automatically_derived]
    |
 
 error[E0518]: attribute should be applied to function or closure
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:42:17
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:43:17
    |
 LL |     mod inner { #![inline] }
    |     ------------^^^^^^^^^^-- not a function or closure
 
 error[E0518]: attribute should be applied to function or closure
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:52:5
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:53:5
    |
 LL |     #[inline] struct S;
    |     ^^^^^^^^^ --------- not a function or closure
 
 error[E0518]: attribute should be applied to function or closure
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:56:5
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:57:5
    |
 LL |     #[inline] type T = S;
    |     ^^^^^^^^^ ----------- not a function or closure
 
 error[E0518]: attribute should be applied to function or closure
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:60:5
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:61:5
    |
 LL |     #[inline] impl S { }
    |     ^^^^^^^^^ ---------- not a function or closure
 
 error: attribute should be applied to an `extern crate` item
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:70:17
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:71:17
    |
 LL |     mod inner { #![no_link] }
    |     ------------^^^^^^^^^^^-- not an `extern crate` item
 
 error: attribute should be applied to an `extern crate` item
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:74:5
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:75:5
    |
 LL |     #[no_link] fn f() { }
    |     ^^^^^^^^^^ ---------- not an `extern crate` item
 
 error: attribute should be applied to an `extern crate` item
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:78:5
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:79:5
    |
 LL |     #[no_link] struct S;
    |     ^^^^^^^^^^ --------- not an `extern crate` item
 
 error: attribute should be applied to an `extern crate` item
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:82:5
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:83:5
    |
 LL |     #[no_link]type T = S;
    |     ^^^^^^^^^^----------- not an `extern crate` item
 
 error: attribute should be applied to an `extern crate` item
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:86:5
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:87:5
    |
 LL |     #[no_link] impl S { }
    |     ^^^^^^^^^^ ---------- not an `extern crate` item
 
 error: attribute should be applied to a free function, impl method or static
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:96:17
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:97:17
    |
 LL |     mod inner { #![export_name="2200"] }
    |     ------------^^^^^^^^^^^^^^^^^^^^^^-- not a free function, impl method or static
 
 error: attribute should be applied to a free function, impl method or static
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:102:5
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:103:5
    |
 LL |     #[export_name = "2200"] struct S;
    |     ^^^^^^^^^^^^^^^^^^^^^^^ --------- not a free function, impl method or static
 
 error: attribute should be applied to a free function, impl method or static
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:106:5
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:107:5
    |
 LL |     #[export_name = "2200"] type T = S;
    |     ^^^^^^^^^^^^^^^^^^^^^^^ ----------- not a free function, impl method or static
 
 error: attribute should be applied to a free function, impl method or static
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:110:5
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:111:5
    |
 LL |     #[export_name = "2200"] impl S { }
    |     ^^^^^^^^^^^^^^^^^^^^^^^ ---------- not a free function, impl method or static
 
 error: attribute should be applied to a free function, impl method or static
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:115:9
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:116:9
    |
 LL |         #[export_name = "2200"] fn foo();
    |         ^^^^^^^^^^^^^^^^^^^^^^^ --------- not a free function, impl method or static
 
 error: attribute should be applied to a free function, impl method or static
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:119:9
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:120:9
    |
 LL |         #[export_name = "2200"] fn bar() {}
    |         ^^^^^^^^^^^^^^^^^^^^^^^ ----------- not a free function, impl method or static
 
 error[E0517]: attribute should be applied to a struct, enum, or union
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:147:25
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:148:25
    |
 LL |     mod inner { #![repr(C)] }
    |     --------------------^---- not a struct, enum, or union
 
 error[E0517]: attribute should be applied to a struct, enum, or union
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:151:12
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:152:12
    |
 LL |     #[repr(C)] fn f() { }
    |            ^   ---------- not a struct, enum, or union
 
 error[E0517]: attribute should be applied to a struct, enum, or union
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:157:12
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:158:12
    |
 LL |     #[repr(C)] type T = S;
    |            ^   ----------- not a struct, enum, or union
 
 error[E0517]: attribute should be applied to a struct, enum, or union
-  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:161:12
+  --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:162:12
    |
 LL |     #[repr(C)] impl S { }
    |            ^   ---------- not a struct, enum, or union
diff --git a/tests/ui/feature-gates/issue-43106-gating-of-derive.stderr b/tests/ui/feature-gates/issue-43106-gating-of-derive.stderr
index bb8651ffb0955..4dee7a00544e4 100644
--- a/tests/ui/feature-gates/issue-43106-gating-of-derive.stderr
+++ b/tests/ui/feature-gates/issue-43106-gating-of-derive.stderr
@@ -21,6 +21,7 @@ LL |     mod inner { #![derive(Debug)] }
    |
    = note: see issue #54726 <https://github.com/rust-lang/rust/issues/54726> for more information
    = help: add `#![feature(custom_inner_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0774]: `derive` may only be applied to `struct`s, `enum`s and `union`s
   --> $DIR/issue-43106-gating-of-derive.rs:7:17
diff --git a/tests/ui/feature-gates/issue-49983-see-issue-0.stderr b/tests/ui/feature-gates/issue-49983-see-issue-0.stderr
index 5f9e5d440fb24..8f090c9eef906 100644
--- a/tests/ui/feature-gates/issue-49983-see-issue-0.stderr
+++ b/tests/ui/feature-gates/issue-49983-see-issue-0.stderr
@@ -5,6 +5,7 @@ LL | #[allow(unused_imports)] use core::ptr::Unique;
    |                              ^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(ptr_internals)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/rustc-private.stderr b/tests/ui/feature-gates/rustc-private.stderr
index 7419af80a3232..03397cba763d2 100644
--- a/tests/ui/feature-gates/rustc-private.stderr
+++ b/tests/ui/feature-gates/rustc-private.stderr
@@ -6,6 +6,7 @@ LL | extern crate libc;
    |
    = note: see issue #27812 <https://github.com/rust-lang/rust/issues/27812> for more information
    = help: add `#![feature(rustc_private)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/soft-syntax-gates-with-errors.stderr b/tests/ui/feature-gates/soft-syntax-gates-with-errors.stderr
index 49550d811ba52..6f7b402d03b17 100644
--- a/tests/ui/feature-gates/soft-syntax-gates-with-errors.stderr
+++ b/tests/ui/feature-gates/soft-syntax-gates-with-errors.stderr
@@ -6,6 +6,7 @@ LL | macro a() {}
    |
    = note: see issue #39412 <https://github.com/rust-lang/rust/issues/39412> for more information
    = help: add `#![feature(decl_macro)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `macro` is experimental
   --> $DIR/soft-syntax-gates-with-errors.rs:16:5
@@ -15,6 +16,7 @@ LL |     macro c() {}
    |
    = note: see issue #39412 <https://github.com/rust-lang/rust/issues/39412> for more information
    = help: add `#![feature(decl_macro)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/feature-gates/soft-syntax-gates-without-errors.stderr b/tests/ui/feature-gates/soft-syntax-gates-without-errors.stderr
index 3d9c22e548710..817e28570f21e 100644
--- a/tests/ui/feature-gates/soft-syntax-gates-without-errors.stderr
+++ b/tests/ui/feature-gates/soft-syntax-gates-without-errors.stderr
@@ -6,6 +6,7 @@ LL | macro b() {}
    |
    = note: see issue #39412 <https://github.com/rust-lang/rust/issues/39412> for more information
    = help: add `#![feature(decl_macro)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = warning: unstable syntax can change at any point in the future, causing a hard error!
    = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
 
@@ -17,6 +18,7 @@ LL |     macro e() {}
    |
    = note: see issue #39412 <https://github.com/rust-lang/rust/issues/39412> for more information
    = help: add `#![feature(decl_macro)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = warning: unstable syntax can change at any point in the future, causing a hard error!
    = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
 
diff --git a/tests/ui/feature-gates/trace_macros-gate.stderr b/tests/ui/feature-gates/trace_macros-gate.stderr
index 1ca10aeece566..1313a0e8ae26c 100644
--- a/tests/ui/feature-gates/trace_macros-gate.stderr
+++ b/tests/ui/feature-gates/trace_macros-gate.stderr
@@ -6,6 +6,7 @@ LL |     trace_macros!();
    |
    = note: see issue #29598 <https://github.com/rust-lang/rust/issues/29598> for more information
    = help: add `#![feature(trace_macros)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: trace_macros! accepts only `true` or `false`
   --> $DIR/trace_macros-gate.rs:4:5
@@ -21,6 +22,7 @@ LL |     trace_macros!(true);
    |
    = note: see issue #29598 <https://github.com/rust-lang/rust/issues/29598> for more information
    = help: add `#![feature(trace_macros)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'trace_macros': `trace_macros` is not stable enough for use and is subject to change
   --> $DIR/trace_macros-gate.rs:7:5
@@ -30,6 +32,7 @@ LL |     trace_macros!(false);
    |
    = note: see issue #29598 <https://github.com/rust-lang/rust/issues/29598> for more information
    = help: add `#![feature(trace_macros)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'trace_macros': `trace_macros` is not stable enough for use and is subject to change
   --> $DIR/trace_macros-gate.rs:10:26
@@ -42,6 +45,7 @@ LL |     expando!(true);
    |
    = note: see issue #29598 <https://github.com/rust-lang/rust/issues/29598> for more information
    = help: add `#![feature(trace_macros)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the macro `expando` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 5 previous errors
diff --git a/tests/ui/generic-const-items/feature-gate-generic_const_items.stderr b/tests/ui/generic-const-items/feature-gate-generic_const_items.stderr
index a1fdf5f6ef33e..12882bd3470ae 100644
--- a/tests/ui/generic-const-items/feature-gate-generic_const_items.stderr
+++ b/tests/ui/generic-const-items/feature-gate-generic_const_items.stderr
@@ -6,6 +6,7 @@ LL |     const ONE<T>: i32;
    |
    = note: see issue #113521 <https://github.com/rust-lang/rust/issues/113521> for more information
    = help: add `#![feature(generic_const_items)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: generic const items are experimental
   --> $DIR/feature-gate-generic_const_items.rs:6:5
@@ -16,6 +17,7 @@ LL | |         A: Copy;
    |
    = note: see issue #113521 <https://github.com/rust-lang/rust/issues/113521> for more information
    = help: add `#![feature(generic_const_items)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: generic const items are experimental
   --> $DIR/feature-gate-generic_const_items.rs:11:12
@@ -25,6 +27,7 @@ LL | const CONST<T>: i32 = 0;
    |
    = note: see issue #113521 <https://github.com/rust-lang/rust/issues/113521> for more information
    = help: add `#![feature(generic_const_items)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: generic const items are experimental
   --> $DIR/feature-gate-generic_const_items.rs:14:12
@@ -34,6 +37,7 @@ LL | const EMPTY<>: i32 = 0;
    |
    = note: see issue #113521 <https://github.com/rust-lang/rust/issues/113521> for more information
    = help: add `#![feature(generic_const_items)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: generic const items are experimental
   --> $DIR/feature-gate-generic_const_items.rs:18:1
@@ -44,6 +48,7 @@ LL | |     String: Clone;
    |
    = note: see issue #113521 <https://github.com/rust-lang/rust/issues/113521> for more information
    = help: add `#![feature(generic_const_items)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: generic const items are experimental
   --> $DIR/feature-gate-generic_const_items.rs:28:22
@@ -53,6 +58,7 @@ LL | discard! { const FREE<T>: () = (); }
    |
    = note: see issue #113521 <https://github.com/rust-lang/rust/issues/113521> for more information
    = help: add `#![feature(generic_const_items)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: generic const items are experimental
   --> $DIR/feature-gate-generic_const_items.rs:31:33
@@ -62,6 +68,7 @@ LL | discard! { impl () { const ASSOC<const N: ()>: () = (); } }
    |
    = note: see issue #113521 <https://github.com/rust-lang/rust/issues/113521> for more information
    = help: add `#![feature(generic_const_items)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: generic const items are experimental
   --> $DIR/feature-gate-generic_const_items.rs:34:43
@@ -71,6 +78,7 @@ LL | discard! { impl () { const ASSOC: i32 = 0 where String: Copy; } }
    |
    = note: see issue #113521 <https://github.com/rust-lang/rust/issues/113521> for more information
    = help: add `#![feature(generic_const_items)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 8 previous errors
 
diff --git a/tests/ui/half-open-range-patterns/feature-gate-half-open-range-patterns-in-slices.stderr b/tests/ui/half-open-range-patterns/feature-gate-half-open-range-patterns-in-slices.stderr
index b44a69525a65c..8ae8f052e5be4 100644
--- a/tests/ui/half-open-range-patterns/feature-gate-half-open-range-patterns-in-slices.stderr
+++ b/tests/ui/half-open-range-patterns/feature-gate-half-open-range-patterns-in-slices.stderr
@@ -6,6 +6,7 @@ LL |     let [a @ 3.., b @ ..3, c @ 4..6, ..] = xs;
    |
    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
    = help: add `#![feature(half_open_range_patterns_in_slices)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/half-open-range-patterns/range_pat_interactions1.stderr b/tests/ui/half-open-range-patterns/range_pat_interactions1.stderr
index 19ebcaf0f3699..e2fab14ffc235 100644
--- a/tests/ui/half-open-range-patterns/range_pat_interactions1.stderr
+++ b/tests/ui/half-open-range-patterns/range_pat_interactions1.stderr
@@ -20,6 +20,7 @@ LL |         if let n @ 2..3|4 = x {
    |
    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: exclusive range pattern syntax is experimental
   --> $DIR/range_pat_interactions1.rs:14:23
@@ -29,6 +30,7 @@ LL |         } else if let 2..3 | 4 = x {
    |
    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 4 previous errors
 
diff --git a/tests/ui/half-open-range-patterns/range_pat_interactions3.stderr b/tests/ui/half-open-range-patterns/range_pat_interactions3.stderr
index f7fda67758fed..fe233496261c1 100644
--- a/tests/ui/half-open-range-patterns/range_pat_interactions3.stderr
+++ b/tests/ui/half-open-range-patterns/range_pat_interactions3.stderr
@@ -6,6 +6,7 @@ LL |             y @ 0..const { 5 + 1 } => assert_eq!(y, 5),
    |
    = note: see issue #76001 <https://github.com/rust-lang/rust/issues/76001> for more information
    = help: add `#![feature(inline_const_pat)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: exclusive range pattern syntax is experimental
   --> $DIR/range_pat_interactions3.rs:10:17
@@ -15,6 +16,7 @@ LL |             1 | -3..0 => first_or.push(x),
    |
    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: exclusive range pattern syntax is experimental
   --> $DIR/range_pat_interactions3.rs:12:18
@@ -24,6 +26,7 @@ LL |             y @ (0..5 | 6) => or_two.push(y),
    |
    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: exclusive range pattern syntax is experimental
   --> $DIR/range_pat_interactions3.rs:14:17
@@ -33,6 +36,7 @@ LL |             y @ 0..const { 5 + 1 } => assert_eq!(y, 5),
    |
    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: exclusive range pattern syntax is experimental
   --> $DIR/range_pat_interactions3.rs:18:17
@@ -42,6 +46,7 @@ LL |             y @ ..-7 => assert_eq!(y, -8),
    |
    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 5 previous errors
 
diff --git a/tests/ui/half-open-range-patterns/slice_pattern_syntax_problem1.stderr b/tests/ui/half-open-range-patterns/slice_pattern_syntax_problem1.stderr
index 3bca554b1e553..5edd877bee03e 100644
--- a/tests/ui/half-open-range-patterns/slice_pattern_syntax_problem1.stderr
+++ b/tests/ui/half-open-range-patterns/slice_pattern_syntax_problem1.stderr
@@ -6,6 +6,7 @@ LL |     let [a @ 3.., b @ ..3, c @ 4..6, ..] = xs;
    |
    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
    = help: add `#![feature(half_open_range_patterns_in_slices)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: exclusive range pattern syntax is experimental
   --> $DIR/slice_pattern_syntax_problem1.rs:4:23
@@ -15,6 +16,7 @@ LL |     let [a @ 3.., b @ ..3, c @ 4..6, ..] = xs;
    |
    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: exclusive range pattern syntax is experimental
   --> $DIR/slice_pattern_syntax_problem1.rs:4:32
@@ -24,6 +26,7 @@ LL |     let [a @ 3.., b @ ..3, c @ 4..6, ..] = xs;
    |
    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/higher-ranked/trait-bounds/hrtb-wrong-kind.stderr b/tests/ui/higher-ranked/trait-bounds/hrtb-wrong-kind.stderr
index 765ea9f785403..b512e0bdb43a5 100644
--- a/tests/ui/higher-ranked/trait-bounds/hrtb-wrong-kind.stderr
+++ b/tests/ui/higher-ranked/trait-bounds/hrtb-wrong-kind.stderr
@@ -6,6 +6,7 @@ LL | fn a() where for<T> T: Copy {}
    |
    = note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information
    = help: add `#![feature(non_lifetime_binders)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: only lifetime parameters can be used in this context
   --> $DIR/hrtb-wrong-kind.rs:4:24
@@ -15,6 +16,7 @@ LL | fn b() where for<const C: usize> [(); C]: Copy {}
    |
    = note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information
    = help: add `#![feature(non_lifetime_binders)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/impl-trait/issues/issue-78722-2.stderr b/tests/ui/impl-trait/issues/issue-78722-2.stderr
index 69c734530f2a6..c402ce864c74c 100644
--- a/tests/ui/impl-trait/issues/issue-78722-2.stderr
+++ b/tests/ui/impl-trait/issues/issue-78722-2.stderr
@@ -25,6 +25,7 @@ LL |         let f: F = async { 1 };
    |
    = note: see issue #85368 <https://github.com/rust-lang/rust/issues/85368> for more information
    = help: add `#![feature(const_async_blocks)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/impl-trait/issues/issue-78722.stderr b/tests/ui/impl-trait/issues/issue-78722.stderr
index 5ad659697314a..0bb24fae822b5 100644
--- a/tests/ui/impl-trait/issues/issue-78722.stderr
+++ b/tests/ui/impl-trait/issues/issue-78722.stderr
@@ -6,6 +6,7 @@ LL |         let f: F = async { 1 };
    |
    = note: see issue #85368 <https://github.com/rust-lang/rust/issues/85368> for more information
    = help: add `#![feature(const_async_blocks)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0271]: expected `{async block@$DIR/issue-78722.rs:10:13: 10:21}` to be a future that resolves to `u8`, but it resolves to `()`
   --> $DIR/issue-78722.rs:8:30
diff --git a/tests/ui/impl-trait/where-allowed.stderr b/tests/ui/impl-trait/where-allowed.stderr
index 5e8a8637d0480..3e1d4e22272d5 100644
--- a/tests/ui/impl-trait/where-allowed.stderr
+++ b/tests/ui/impl-trait/where-allowed.stderr
@@ -24,6 +24,7 @@ LL |     type Out = impl Debug;
    |
    = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
    = help: add `#![feature(impl_trait_in_assoc_type)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `impl Trait` in type aliases is unstable
   --> $DIR/where-allowed.rs:154:23
@@ -33,6 +34,7 @@ LL | type InTypeAlias<R> = impl Debug;
    |
    = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
    = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `impl Trait` in type aliases is unstable
   --> $DIR/where-allowed.rs:157:39
@@ -42,6 +44,7 @@ LL | type InReturnInTypeAlias<R> = fn() -> impl Debug;
    |
    = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
    = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0562]: `impl Trait` is not allowed in `fn` pointer parameters
   --> $DIR/where-allowed.rs:18:40
diff --git a/tests/ui/imports/issue-37887.stderr b/tests/ui/imports/issue-37887.stderr
index 75185cad3b764..6117fd21af188 100644
--- a/tests/ui/imports/issue-37887.stderr
+++ b/tests/ui/imports/issue-37887.stderr
@@ -14,6 +14,7 @@ LL |     extern crate libc;
    |
    = note: see issue #27812 <https://github.com/rust-lang/rust/issues/27812> for more information
    = help: add `#![feature(rustc_private)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/inference/inference_unstable_forced.stderr b/tests/ui/inference/inference_unstable_forced.stderr
index 2301eacc596dd..26eaddd27072a 100644
--- a/tests/ui/inference/inference_unstable_forced.stderr
+++ b/tests/ui/inference/inference_unstable_forced.stderr
@@ -6,6 +6,7 @@ LL |     assert_eq!('x'.ipu_flatten(), 0);
    |
    = note: see issue #99999 <https://github.com/rust-lang/rust/issues/99999> for more information
    = help: add `#![feature(ipu_flatten)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/internal/internal-unstable-noallow.stderr b/tests/ui/internal/internal-unstable-noallow.stderr
index b0ceae62aba73..b39456b1caeca 100644
--- a/tests/ui/internal/internal-unstable-noallow.stderr
+++ b/tests/ui/internal/internal-unstable-noallow.stderr
@@ -5,6 +5,7 @@ LL |     call_unstable_noallow!();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(function)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the macro `call_unstable_noallow` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0658]: use of unstable library feature 'struct_field'
@@ -14,6 +15,7 @@ LL |     construct_unstable_noallow!(0);
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(struct_field)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the macro `construct_unstable_noallow` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0658]: use of unstable library feature 'method'
@@ -23,6 +25,7 @@ LL |     |x: internal_unstable::Foo| { call_method_noallow!(x) };
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(method)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the macro `call_method_noallow` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0658]: use of unstable library feature 'struct2_field'
@@ -32,6 +35,7 @@ LL |     |x: internal_unstable::Bar| { access_field_noallow!(x) };
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(struct2_field)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the macro `access_field_noallow` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 4 previous errors
diff --git a/tests/ui/internal/internal-unstable-thread-local.stderr b/tests/ui/internal/internal-unstable-thread-local.stderr
index 7c07c762827d4..58c7b3f67ebef 100644
--- a/tests/ui/internal/internal-unstable-thread-local.stderr
+++ b/tests/ui/internal/internal-unstable-thread-local.stderr
@@ -5,6 +5,7 @@ LL | thread_local!(static BAR: () = internal_unstable::unstable());
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(function)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/internal/internal-unstable.stderr b/tests/ui/internal/internal-unstable.stderr
index b7c47365c2d27..af5ac21e69640 100644
--- a/tests/ui/internal/internal-unstable.stderr
+++ b/tests/ui/internal/internal-unstable.stderr
@@ -5,6 +5,7 @@ LL |     pass_through_allow!(internal_unstable::unstable());
    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(function)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'function'
   --> $DIR/internal-unstable.rs:42:27
@@ -13,6 +14,7 @@ LL |     pass_through_noallow!(internal_unstable::unstable());
    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(function)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'function'
   --> $DIR/internal-unstable.rs:46:22
@@ -21,6 +23,7 @@ LL |     println!("{:?}", internal_unstable::unstable());
    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(function)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'function'
   --> $DIR/internal-unstable.rs:48:10
@@ -29,6 +32,7 @@ LL |     bar!(internal_unstable::unstable());
    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(function)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'function'
   --> $DIR/internal-unstable.rs:18:9
@@ -40,6 +44,7 @@ LL |     bar!(internal_unstable::unstable());
    |     ----------------------------------- in this macro invocation
    |
    = help: add `#![feature(function)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the macro `foo` which comes from the expansion of the macro `bar` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 5 previous errors
diff --git a/tests/ui/intrinsics/feature-gate-safe-intrinsic.stderr b/tests/ui/intrinsics/feature-gate-safe-intrinsic.stderr
index 8aeb56598ec1c..e49880e9bb8d9 100644
--- a/tests/ui/intrinsics/feature-gate-safe-intrinsic.stderr
+++ b/tests/ui/intrinsics/feature-gate-safe-intrinsic.stderr
@@ -5,6 +5,7 @@ LL | #[rustc_safe_intrinsic]
    | ^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: attribute should be applied to intrinsic functions
   --> $DIR/feature-gate-safe-intrinsic.rs:1:1
diff --git a/tests/ui/intrinsics/unchecked_math_unstable.stderr b/tests/ui/intrinsics/unchecked_math_unstable.stderr
index a43aa16aedc28..c2a116b620046 100644
--- a/tests/ui/intrinsics/unchecked_math_unstable.stderr
+++ b/tests/ui/intrinsics/unchecked_math_unstable.stderr
@@ -5,6 +5,7 @@ LL |         let add = std::intrinsics::unchecked_add(x, y);
    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(core_intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'core_intrinsics': intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library
   --> $DIR/unchecked_math_unstable.rs:5:19
@@ -13,6 +14,7 @@ LL |         let sub = std::intrinsics::unchecked_sub(x, y);
    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(core_intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'core_intrinsics': intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library
   --> $DIR/unchecked_math_unstable.rs:6:19
@@ -21,6 +23,7 @@ LL |         let mul = std::intrinsics::unchecked_mul(x, y);
    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(core_intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/issues/issue-20313.stderr b/tests/ui/issues/issue-20313.stderr
index f740b0cca06c0..a61495440f0fa 100644
--- a/tests/ui/issues/issue-20313.stderr
+++ b/tests/ui/issues/issue-20313.stderr
@@ -6,6 +6,7 @@ LL |     fn sqrt(x: f32) -> f32;
    |
    = note: see issue #29602 <https://github.com/rust-lang/rust/issues/29602> for more information
    = help: add `#![feature(link_llvm_intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/issues/issue-23024.stderr b/tests/ui/issues/issue-23024.stderr
index 7d187de1bc440..1672622d8b723 100644
--- a/tests/ui/issues/issue-23024.stderr
+++ b/tests/ui/issues/issue-23024.stderr
@@ -6,6 +6,7 @@ LL |     println!("{:?}",(vfnfer[0] as dyn Fn)(3));
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0107]: missing generics for trait `Fn`
   --> $DIR/issue-23024.rs:8:39
diff --git a/tests/ui/issues/issue-32782.stderr b/tests/ui/issues/issue-32782.stderr
index 477c01f686403..830d83f6e57b7 100644
--- a/tests/ui/issues/issue-32782.stderr
+++ b/tests/ui/issues/issue-32782.stderr
@@ -8,6 +8,7 @@ LL | foo!();
    | ------ in this macro invocation
    |
    = help: add `#![feature(allow_internal_unstable)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 1 previous error
diff --git a/tests/ui/issues/issue-50582.stderr b/tests/ui/issues/issue-50582.stderr
index 9eafd7ab4f0fa..7b65fa25ae37e 100644
--- a/tests/ui/issues/issue-50582.stderr
+++ b/tests/ui/issues/issue-50582.stderr
@@ -6,6 +6,7 @@ LL |     Vec::<[(); 1 + for x in 0..1 {}]>::new();
    |
    = note: see issue #87575 <https://github.com/rust-lang/rust/issues/87575> for more information
    = help: add `#![feature(const_for)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0277]: cannot add `()` to `{integer}`
   --> $DIR/issue-50582.rs:2:18
diff --git a/tests/ui/issues/issue-50585.stderr b/tests/ui/issues/issue-50585.stderr
index e43cc20cbb57d..13181f1cf7fe4 100644
--- a/tests/ui/issues/issue-50585.stderr
+++ b/tests/ui/issues/issue-50585.stderr
@@ -6,6 +6,7 @@ LL |     |y: Vec<[(); for x in 0..2 {}]>| {};
    |
    = note: see issue #87575 <https://github.com/rust-lang/rust/issues/87575> for more information
    = help: add `#![feature(const_for)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0308]: mismatched types
   --> $DIR/issue-50585.rs:2:18
diff --git a/tests/ui/issues/issue-52489.stderr b/tests/ui/issues/issue-52489.stderr
index 442902bd1c3fd..fa88725bcebf4 100644
--- a/tests/ui/issues/issue-52489.stderr
+++ b/tests/ui/issues/issue-52489.stderr
@@ -5,6 +5,7 @@ LL | use issue_52489;
    |     ^^^^^^^^^^^
    |
    = help: add `#![feature(issue_52489_unstable)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/lang-items/issue-83471.stderr b/tests/ui/lang-items/issue-83471.stderr
index b315df179d01c..1f22d966dd7d7 100644
--- a/tests/ui/lang-items/issue-83471.stderr
+++ b/tests/ui/lang-items/issue-83471.stderr
@@ -11,6 +11,7 @@ LL | #[lang = "sized"]
    | ^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(lang_items)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: language items are subject to change
   --> $DIR/issue-83471.rs:11:1
@@ -19,6 +20,7 @@ LL | #[lang = "fn"]
    | ^^^^^^^^^^^^^^
    |
    = help: add `#![feature(lang_items)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 warning: anonymous parameters are deprecated and will be removed in the next edition
   --> $DIR/issue-83471.rs:15:13
diff --git a/tests/ui/linkage-attr/linkage4.stderr b/tests/ui/linkage-attr/linkage4.stderr
index f76655b3c7254..8fbcaf841b663 100644
--- a/tests/ui/linkage-attr/linkage4.stderr
+++ b/tests/ui/linkage-attr/linkage4.stderr
@@ -6,6 +6,7 @@ LL | #[linkage = "external"]
    |
    = note: see issue #29603 <https://github.com/rust-lang/rust/issues/29603> for more information
    = help: add `#![feature(linkage)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/lint/lint-output-format.stderr b/tests/ui/lint/lint-output-format.stderr
index 0db79a1564fa2..c399b6cdbc257 100644
--- a/tests/ui/lint/lint-output-format.stderr
+++ b/tests/ui/lint/lint-output-format.stderr
@@ -5,6 +5,7 @@ LL | extern crate lint_output_format;
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-output-format.rs:7:26
@@ -13,6 +14,7 @@ LL | use lint_output_format::{foo, bar};
    |                          ^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-output-format.rs:7:31
@@ -21,6 +23,7 @@ LL | use lint_output_format::{foo, bar};
    |                               ^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-output-format.rs:12:14
@@ -29,6 +32,7 @@ LL |     let _y = bar();
    |              ^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 4 previous errors
 
diff --git a/tests/ui/lint/lint-stability-2.stderr b/tests/ui/lint/lint-stability-2.stderr
index 5b7537fa234a4..20d49780a919f 100644
--- a/tests/ui/lint/lint-stability-2.stderr
+++ b/tests/ui/lint/lint-stability-2.stderr
@@ -5,6 +5,7 @@ LL |         foo.method_deprecated_unstable();
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:42:9
@@ -13,6 +14,7 @@ LL |         Foo::method_deprecated_unstable(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:44:9
@@ -21,6 +23,7 @@ LL |         <Foo>::method_deprecated_unstable(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:46:13
@@ -29,6 +32,7 @@ LL |         foo.trait_deprecated_unstable();
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:48:9
@@ -37,6 +41,7 @@ LL |         <Foo>::trait_deprecated_unstable(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:51:13
@@ -45,6 +50,7 @@ LL |         foo.method_deprecated_unstable_text();
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:53:9
@@ -53,6 +59,7 @@ LL |         Foo::method_deprecated_unstable_text(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:55:9
@@ -61,6 +68,7 @@ LL |         <Foo>::method_deprecated_unstable_text(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:57:13
@@ -69,6 +77,7 @@ LL |         foo.trait_deprecated_unstable_text();
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:59:9
@@ -77,6 +86,7 @@ LL |         <Foo>::trait_deprecated_unstable_text(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:62:13
@@ -85,6 +95,7 @@ LL |         foo.method_unstable();
    |             ^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:63:9
@@ -93,6 +104,7 @@ LL |         Foo::method_unstable(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:64:9
@@ -101,6 +113,7 @@ LL |         <Foo>::method_unstable(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:65:13
@@ -109,6 +122,7 @@ LL |         foo.trait_unstable();
    |             ^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:66:9
@@ -117,6 +131,7 @@ LL |         <Foo>::trait_unstable(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature': text
   --> $DIR/lint-stability-2.rs:68:13
@@ -125,6 +140,7 @@ LL |         foo.method_unstable_text();
    |             ^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature': text
   --> $DIR/lint-stability-2.rs:70:9
@@ -133,6 +149,7 @@ LL |         Foo::method_unstable_text(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature': text
   --> $DIR/lint-stability-2.rs:72:9
@@ -141,6 +158,7 @@ LL |         <Foo>::method_unstable_text(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature': text
   --> $DIR/lint-stability-2.rs:74:13
@@ -149,6 +167,7 @@ LL |         foo.trait_unstable_text();
    |             ^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature': text
   --> $DIR/lint-stability-2.rs:76:9
@@ -157,6 +176,7 @@ LL |         <Foo>::trait_unstable_text(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:131:13
@@ -165,6 +185,7 @@ LL |         foo.trait_deprecated_unstable();
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:133:9
@@ -173,6 +194,7 @@ LL |         <Foo>::trait_deprecated_unstable(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:135:13
@@ -181,6 +203,7 @@ LL |         foo.trait_deprecated_unstable_text();
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:137:9
@@ -189,6 +212,7 @@ LL |         <Foo>::trait_deprecated_unstable_text(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:139:13
@@ -197,6 +221,7 @@ LL |         foo.trait_unstable();
    |             ^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:140:9
@@ -205,6 +230,7 @@ LL |         <Foo>::trait_unstable(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature': text
   --> $DIR/lint-stability-2.rs:141:13
@@ -213,6 +239,7 @@ LL |         foo.trait_unstable_text();
    |             ^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature': text
   --> $DIR/lint-stability-2.rs:143:9
@@ -221,6 +248,7 @@ LL |         <Foo>::trait_unstable_text(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:154:13
@@ -229,6 +257,7 @@ LL |         foo.trait_deprecated_unstable();
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:156:13
@@ -237,6 +266,7 @@ LL |         foo.trait_deprecated_unstable_text();
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-2.rs:158:13
@@ -245,6 +275,7 @@ LL |         foo.trait_unstable();
    |             ^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature': text
   --> $DIR/lint-stability-2.rs:159:13
@@ -253,6 +284,7 @@ LL |         foo.trait_unstable_text();
    |             ^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 32 previous errors
 
diff --git a/tests/ui/lint/lint-stability-fields.stderr b/tests/ui/lint/lint-stability-fields.stderr
index 3d2e73c1e8e92..9dffe94c12e6c 100644
--- a/tests/ui/lint/lint-stability-fields.stderr
+++ b/tests/ui/lint/lint-stability-fields.stderr
@@ -5,6 +5,7 @@ LL |         let x = Unstable {
    |                 ^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:66:13
@@ -13,6 +14,7 @@ LL |         let Unstable {
    |             ^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:72:13
@@ -21,6 +23,7 @@ LL |         let Unstable
    |             ^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:77:17
@@ -29,6 +32,7 @@ LL |         let x = reexport::Unstable2(1, 2, 3);
    |                 ^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:79:17
@@ -37,6 +41,7 @@ LL |         let x = Unstable2(1, 2, 3);
    |                 ^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:85:13
@@ -45,6 +50,7 @@ LL |         let Unstable2
    |             ^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:90:13
@@ -53,6 +59,7 @@ LL |         let Unstable2
    |             ^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:95:17
@@ -61,6 +68,7 @@ LL |         let x = Deprecated {
    |                 ^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:105:13
@@ -69,6 +77,7 @@ LL |         let Deprecated {
    |             ^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:111:13
@@ -77,6 +86,7 @@ LL |         let Deprecated
    |             ^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:115:17
@@ -85,6 +95,7 @@ LL |         let x = Deprecated2(1, 2, 3);
    |                 ^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:121:13
@@ -93,6 +104,7 @@ LL |         let Deprecated2
    |             ^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:126:13
@@ -101,6 +113,7 @@ LL |         let Deprecated2
    |             ^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:21:13
@@ -109,6 +122,7 @@ LL |             override1: 2,
    |             ^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:22:13
@@ -117,6 +131,7 @@ LL |             override2: 3,
    |             ^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:27:17
@@ -125,6 +140,7 @@ LL |         let _ = x.override1;
    |                 ^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:28:17
@@ -133,6 +149,7 @@ LL |         let _ = x.override2;
    |                 ^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:33:13
@@ -141,6 +158,7 @@ LL |             override1: _,
    |             ^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:34:13
@@ -149,6 +167,7 @@ LL |             override2: _,
    |             ^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:43:17
@@ -157,6 +176,7 @@ LL |         let _ = x.1;
    |                 ^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:44:17
@@ -165,6 +185,7 @@ LL |         let _ = x.2;
    |                 ^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:48:20
@@ -173,6 +194,7 @@ LL |                    _,
    |                    ^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:49:20
@@ -181,6 +203,7 @@ LL |                    _,
    |                    ^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:57:13
@@ -189,6 +212,7 @@ LL |             inherit: 1,
    |             ^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:59:13
@@ -197,6 +221,7 @@ LL |             override2: 3,
    |             ^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:62:17
@@ -205,6 +230,7 @@ LL |         let _ = x.inherit;
    |                 ^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:64:17
@@ -213,6 +239,7 @@ LL |         let _ = x.override2;
    |                 ^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:67:13
@@ -221,6 +248,7 @@ LL |             inherit: _,
    |             ^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:69:13
@@ -229,6 +257,7 @@ LL |             override2: _
    |             ^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:81:17
@@ -237,6 +266,7 @@ LL |         let _ = x.0;
    |                 ^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:83:17
@@ -245,6 +275,7 @@ LL |         let _ = x.2;
    |                 ^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:86:14
@@ -253,6 +284,7 @@ LL |             (_,
    |              ^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:88:14
@@ -261,6 +293,7 @@ LL |              _)
    |              ^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:96:13
@@ -269,6 +302,7 @@ LL |             inherit: 1,
    |             ^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:98:13
@@ -277,6 +311,7 @@ LL |             override2: 3,
    |             ^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:101:17
@@ -285,6 +320,7 @@ LL |         let _ = x.inherit;
    |                 ^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:103:17
@@ -293,6 +329,7 @@ LL |         let _ = x.override2;
    |                 ^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:106:13
@@ -301,6 +338,7 @@ LL |             inherit: _,
    |             ^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:108:13
@@ -309,6 +347,7 @@ LL |             override2: _
    |             ^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:117:17
@@ -317,6 +356,7 @@ LL |         let _ = x.0;
    |                 ^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:119:17
@@ -325,6 +365,7 @@ LL |         let _ = x.2;
    |                 ^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:122:14
@@ -333,6 +374,7 @@ LL |             (_,
    |              ^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability-fields.rs:124:14
@@ -341,6 +383,7 @@ LL |              _)
    |              ^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 43 previous errors
 
diff --git a/tests/ui/lint/lint-stability.stderr b/tests/ui/lint/lint-stability.stderr
index bd1a57dc4cc50..af5816d4564f1 100644
--- a/tests/ui/lint/lint-stability.stderr
+++ b/tests/ui/lint/lint-stability.stderr
@@ -5,6 +5,7 @@ LL |     extern crate stability_cfg2;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:45:9
@@ -13,6 +14,7 @@ LL |         deprecated_unstable();
    |         ^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:47:9
@@ -21,6 +23,7 @@ LL |         Trait::trait_deprecated_unstable(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:49:9
@@ -29,6 +32,7 @@ LL |         <Foo as Trait>::trait_deprecated_unstable(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:52:9
@@ -37,6 +41,7 @@ LL |         deprecated_unstable_text();
    |         ^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:54:9
@@ -45,6 +50,7 @@ LL |         Trait::trait_deprecated_unstable_text(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:56:9
@@ -53,6 +59,7 @@ LL |         <Foo as Trait>::trait_deprecated_unstable_text(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:59:9
@@ -61,6 +68,7 @@ LL |         unstable();
    |         ^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:60:9
@@ -69,6 +77,7 @@ LL |         Trait::trait_unstable(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:61:9
@@ -77,6 +86,7 @@ LL |         <Foo as Trait>::trait_unstable(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature': text
   --> $DIR/lint-stability.rs:63:9
@@ -85,6 +95,7 @@ LL |         unstable_text();
    |         ^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature': text
   --> $DIR/lint-stability.rs:65:9
@@ -93,6 +104,7 @@ LL |         Trait::trait_unstable_text(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature': text
   --> $DIR/lint-stability.rs:67:9
@@ -101,6 +113,7 @@ LL |         <Foo as Trait>::trait_unstable_text(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:99:17
@@ -109,6 +122,7 @@ LL |         let _ = DeprecatedUnstableStruct {
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:103:17
@@ -117,6 +131,7 @@ LL |         let _ = UnstableStruct { i: 0 };
    |                 ^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:107:17
@@ -125,6 +140,7 @@ LL |         let _ = DeprecatedUnstableUnitStruct;
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:109:17
@@ -133,6 +149,7 @@ LL |         let _ = UnstableUnitStruct;
    |                 ^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:113:17
@@ -141,6 +158,7 @@ LL |         let _ = Enum::DeprecatedUnstableVariant;
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:115:17
@@ -149,6 +167,7 @@ LL |         let _ = Enum::UnstableVariant;
    |                 ^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:119:17
@@ -157,6 +176,7 @@ LL |         let _ = DeprecatedUnstableTupleStruct (1);
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:121:17
@@ -165,6 +185,7 @@ LL |         let _ = UnstableTupleStruct (1);
    |                 ^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:130:25
@@ -173,6 +194,7 @@ LL |         macro_test_arg!(deprecated_unstable_text());
    |                         ^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:144:9
@@ -181,6 +203,7 @@ LL |         Trait::trait_deprecated_unstable(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:146:9
@@ -189,6 +212,7 @@ LL |         <Foo as Trait>::trait_deprecated_unstable(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:148:9
@@ -197,6 +221,7 @@ LL |         Trait::trait_deprecated_unstable_text(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:150:9
@@ -205,6 +230,7 @@ LL |         <Foo as Trait>::trait_deprecated_unstable_text(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:152:9
@@ -213,6 +239,7 @@ LL |         Trait::trait_unstable(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:153:9
@@ -221,6 +248,7 @@ LL |         <Foo as Trait>::trait_unstable(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature': text
   --> $DIR/lint-stability.rs:154:9
@@ -229,6 +257,7 @@ LL |         Trait::trait_unstable_text(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature': text
   --> $DIR/lint-stability.rs:156:9
@@ -237,6 +266,7 @@ LL |         <Foo as Trait>::trait_unstable_text(&foo);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:172:10
@@ -245,6 +275,7 @@ LL |     impl UnstableTrait for S { }
    |          ^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:174:24
@@ -253,6 +284,7 @@ LL |     trait LocalTrait : UnstableTrait { }
    |                        ^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:179:9
@@ -261,6 +293,7 @@ LL |         fn trait_unstable(&self) {}
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:184:5
@@ -269,6 +302,7 @@ LL |     extern crate inherited_stability;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:185:9
@@ -277,6 +311,7 @@ LL |     use self::inherited_stability::*;
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:188:9
@@ -285,6 +320,7 @@ LL |         unstable();
    |         ^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:191:9
@@ -293,6 +329,7 @@ LL |         stable_mod::unstable();
    |         ^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:194:9
@@ -301,6 +338,7 @@ LL |         unstable_mod::deprecated();
    |         ^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:195:9
@@ -309,6 +347,7 @@ LL |         unstable_mod::unstable();
    |         ^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:197:17
@@ -317,6 +356,7 @@ LL |         let _ = Unstable::UnstableVariant;
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:198:17
@@ -325,6 +365,7 @@ LL |         let _ = Unstable::StableVariant;
    |                 ^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:88:48
@@ -333,6 +374,7 @@ LL |         struct S1<T: TraitWithAssociatedTypes>(T::TypeUnstable);
    |                                                ^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/lint-stability.rs:92:13
@@ -341,6 +383,7 @@ LL |             TypeUnstable = u8,
    |             ^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 43 previous errors
 
diff --git a/tests/ui/lint/must_not_suspend/feature-gate-must_not_suspend.stderr b/tests/ui/lint/must_not_suspend/feature-gate-must_not_suspend.stderr
index 9ec33b1c49031..e28ff2ec70340 100644
--- a/tests/ui/lint/must_not_suspend/feature-gate-must_not_suspend.stderr
+++ b/tests/ui/lint/must_not_suspend/feature-gate-must_not_suspend.stderr
@@ -6,6 +6,7 @@ LL | #[must_not_suspend = "You gotta use Umm's, ya know?"]
    |
    = note: see issue #83310 <https://github.com/rust-lang/rust/issues/83310> for more information
    = help: add `#![feature(must_not_suspend)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/lint/must_not_suspend/gated.stderr b/tests/ui/lint/must_not_suspend/gated.stderr
index c238c1f3351f3..aff1b6a2ac456 100644
--- a/tests/ui/lint/must_not_suspend/gated.stderr
+++ b/tests/ui/lint/must_not_suspend/gated.stderr
@@ -7,6 +7,7 @@ LL | #![deny(must_not_suspend)]
    = note: the `must_not_suspend` lint is unstable
    = note: see issue #83310 <https://github.com/rust-lang/rust/issues/83310> for more information
    = help: add `#![feature(must_not_suspend)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: `#[warn(unknown_lints)]` on by default
 
 warning: 1 warning emitted
diff --git a/tests/ui/lint/rfc-2383-lint-reason/expect_missing_feature_gate.stderr b/tests/ui/lint/rfc-2383-lint-reason/expect_missing_feature_gate.stderr
index b8e7d61a1ecc2..5d252fdcf5dae 100644
--- a/tests/ui/lint/rfc-2383-lint-reason/expect_missing_feature_gate.stderr
+++ b/tests/ui/lint/rfc-2383-lint-reason/expect_missing_feature_gate.stderr
@@ -6,6 +6,7 @@ LL | #[expect(unused)]
    |
    = note: see issue #54503 <https://github.com/rust-lang/rust/issues/54503> for more information
    = help: add `#![feature(lint_reasons)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/lint/unused/unused-doc-comments-edge-cases.stderr b/tests/ui/lint/unused/unused-doc-comments-edge-cases.stderr
index b5aa6215797d6..55e4834e6707a 100644
--- a/tests/ui/lint/unused/unused-doc-comments-edge-cases.stderr
+++ b/tests/ui/lint/unused/unused-doc-comments-edge-cases.stderr
@@ -12,6 +12,7 @@ LL |     /// useless doc comment
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: `///` is for documentation comments. For a plain comment, use `//`.
 
 error: unused doc comment
diff --git a/tests/ui/macros/issue-68060.rs b/tests/ui/macros/issue-68060.rs
index fb40cd5387b7c..1a826bd60e039 100644
--- a/tests/ui/macros/issue-68060.rs
+++ b/tests/ui/macros/issue-68060.rs
@@ -8,6 +8,7 @@ fn main() {
             #[track_caller]
             //~^ ERROR: `#[track_caller]` on closures is currently unstable
             //~| NOTE: see issue #87417
+            //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
             |_| (),
             //~^ NOTE: not a function
         )
diff --git a/tests/ui/macros/issue-68060.stderr b/tests/ui/macros/issue-68060.stderr
index 52e6ed92e9d23..5724a9ea43843 100644
--- a/tests/ui/macros/issue-68060.stderr
+++ b/tests/ui/macros/issue-68060.stderr
@@ -21,6 +21,7 @@ LL |             #[track_caller]
    |
    = note: see issue #87417 <https://github.com/rust-lang/rust/issues/87417> for more information
    = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/macros/macro-stability.stderr b/tests/ui/macros/macro-stability.stderr
index 2cfdb52b174a9..21b6cef5c9cee 100644
--- a/tests/ui/macros/macro-stability.stderr
+++ b/tests/ui/macros/macro-stability.stderr
@@ -5,6 +5,7 @@ LL |     local_unstable!();
    |     ^^^^^^^^^^^^^^
    |
    = help: add `#![feature(local_unstable)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'local_unstable'
   --> $DIR/macro-stability.rs:23:5
@@ -13,6 +14,7 @@ LL |     local_unstable_modern!();
    |     ^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(local_unstable)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_macros'
   --> $DIR/macro-stability.rs:24:5
@@ -21,6 +23,7 @@ LL |     unstable_macro!();
    |     ^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_macros)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 warning: use of deprecated macro `deprecated_macro`: deprecation note
   --> $DIR/macro-stability.rs:27:5
diff --git a/tests/ui/macros/rfc-3086-metavar-expr/required-feature.stderr b/tests/ui/macros/rfc-3086-metavar-expr/required-feature.stderr
index 2c2cbb15b7288..7f4adb728c0b6 100644
--- a/tests/ui/macros/rfc-3086-metavar-expr/required-feature.stderr
+++ b/tests/ui/macros/rfc-3086-metavar-expr/required-feature.stderr
@@ -6,6 +6,7 @@ LL |         ${ count($e) }
    |
    = note: see issue #83527 <https://github.com/rust-lang/rust/issues/83527> for more information
    = help: add `#![feature(macro_metavar_expr)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: meta-variable expressions are unstable
   --> $DIR/required-feature.rs:11:16
@@ -15,6 +16,7 @@ LL |             ( $$( $$any:tt )* ) => { $$( $$any )* };
    |
    = note: see issue #83527 <https://github.com/rust-lang/rust/issues/83527> for more information
    = help: add `#![feature(macro_metavar_expr)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: meta-variable expressions are unstable
   --> $DIR/required-feature.rs:11:20
@@ -24,6 +26,7 @@ LL |             ( $$( $$any:tt )* ) => { $$( $$any )* };
    |
    = note: see issue #83527 <https://github.com/rust-lang/rust/issues/83527> for more information
    = help: add `#![feature(macro_metavar_expr)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: meta-variable expressions are unstable
   --> $DIR/required-feature.rs:11:39
@@ -33,6 +36,7 @@ LL |             ( $$( $$any:tt )* ) => { $$( $$any )* };
    |
    = note: see issue #83527 <https://github.com/rust-lang/rust/issues/83527> for more information
    = help: add `#![feature(macro_metavar_expr)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: meta-variable expressions are unstable
   --> $DIR/required-feature.rs:11:43
@@ -42,6 +46,7 @@ LL |             ( $$( $$any:tt )* ) => { $$( $$any )* };
    |
    = note: see issue #83527 <https://github.com/rust-lang/rust/issues/83527> for more information
    = help: add `#![feature(macro_metavar_expr)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: meta-variable expressions are unstable
   --> $DIR/required-feature.rs:22:13
@@ -51,6 +56,7 @@ LL |         $( ${ignore($e)} ${index()} )*
    |
    = note: see issue #83527 <https://github.com/rust-lang/rust/issues/83527> for more information
    = help: add `#![feature(macro_metavar_expr)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: meta-variable expressions are unstable
   --> $DIR/required-feature.rs:22:27
@@ -60,6 +66,7 @@ LL |         $( ${ignore($e)} ${index()} )*
    |
    = note: see issue #83527 <https://github.com/rust-lang/rust/issues/83527> for more information
    = help: add `#![feature(macro_metavar_expr)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: meta-variable expressions are unstable
   --> $DIR/required-feature.rs:30:19
@@ -69,6 +76,7 @@ LL |         0 $( + 1 ${ignore($i)} )*
    |
    = note: see issue #83527 <https://github.com/rust-lang/rust/issues/83527> for more information
    = help: add `#![feature(macro_metavar_expr)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: meta-variable expressions are unstable
   --> $DIR/required-feature.rs:37:13
@@ -78,6 +86,7 @@ LL |         $( ${ignore($e)} ${length()} )*
    |
    = note: see issue #83527 <https://github.com/rust-lang/rust/issues/83527> for more information
    = help: add `#![feature(macro_metavar_expr)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: meta-variable expressions are unstable
   --> $DIR/required-feature.rs:37:27
@@ -87,6 +96,7 @@ LL |         $( ${ignore($e)} ${length()} )*
    |
    = note: see issue #83527 <https://github.com/rust-lang/rust/issues/83527> for more information
    = help: add `#![feature(macro_metavar_expr)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 10 previous errors
 
diff --git a/tests/ui/never_type/issue-52443.stderr b/tests/ui/never_type/issue-52443.stderr
index 59292ed68a306..83afd9ef2f2ca 100644
--- a/tests/ui/never_type/issue-52443.stderr
+++ b/tests/ui/never_type/issue-52443.stderr
@@ -14,6 +14,7 @@ LL |     [(); { for _ in 0usize.. {}; 0}];
    |
    = note: see issue #87575 <https://github.com/rust-lang/rust/issues/87575> for more information
    = help: add `#![feature(const_for)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0308]: mismatched types
   --> $DIR/issue-52443.rs:2:10
@@ -59,6 +60,7 @@ LL |     [(); { for _ in 0usize.. {}; 0}];
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0015]: cannot call non-const fn `<RangeFrom<usize> as Iterator>::next` in constants
   --> $DIR/issue-52443.rs:9:21
diff --git a/tests/ui/offset-of/offset-of-unstable.stderr b/tests/ui/offset-of/offset-of-unstable.stderr
index c39882519a5da..4882dee404226 100644
--- a/tests/ui/offset-of/offset-of-unstable.stderr
+++ b/tests/ui/offset-of/offset-of-unstable.stderr
@@ -5,6 +5,7 @@ LL |         Unstable,
    |         ^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/offset-of-unstable.rs:23:9
@@ -13,6 +14,7 @@ LL |         UnstableWithStableFieldType,
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/offset-of-unstable.rs:28:9
@@ -21,6 +23,7 @@ LL |         UnstableWithStableFieldType,
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/offset-of-unstable.rs:12:5
@@ -33,6 +36,7 @@ LL | |     );
    | |_____^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the macro `offset_of` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
@@ -42,6 +46,7 @@ LL |     offset_of!(StableWithUnstableField, unstable);
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the macro `offset_of` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
@@ -51,6 +56,7 @@ LL |     offset_of!(StableWithUnstableFieldType, stable.unstable);
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the macro `offset_of` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
@@ -64,6 +70,7 @@ LL | |     );
    | |_____^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the macro `offset_of` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
@@ -77,6 +84,7 @@ LL | |     );
    | |_____^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the macro `offset_of` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 8 previous errors
diff --git a/tests/ui/on-unimplemented/feature-gate-on-unimplemented.stderr b/tests/ui/on-unimplemented/feature-gate-on-unimplemented.stderr
index 45ef22f4421f0..2733f7478f0a5 100644
--- a/tests/ui/on-unimplemented/feature-gate-on-unimplemented.stderr
+++ b/tests/ui/on-unimplemented/feature-gate-on-unimplemented.stderr
@@ -5,6 +5,7 @@ LL | #[rustc_on_unimplemented = "test error `{Self}` with `{Bar}`"]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/or-patterns/or-patterns-syntactic-pass.stderr b/tests/ui/or-patterns/or-patterns-syntactic-pass.stderr
index c43fe192a73b8..a755342ecf3c3 100644
--- a/tests/ui/or-patterns/or-patterns-syntactic-pass.stderr
+++ b/tests/ui/or-patterns/or-patterns-syntactic-pass.stderr
@@ -6,6 +6,7 @@ LL |     let (box 0 | 1); // Unstable; we *can* change the precedence if we want
    |
    = note: see issue #29641 <https://github.com/rust-lang/rust/issues/29641> for more information
    = help: add `#![feature(box_patterns)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = warning: unstable syntax can change at any point in the future, causing a hard error!
    = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
 
diff --git a/tests/ui/panic-runtime/needs-gate.stderr b/tests/ui/panic-runtime/needs-gate.stderr
index e067ccaebcf64..9f66f05bac98b 100644
--- a/tests/ui/panic-runtime/needs-gate.stderr
+++ b/tests/ui/panic-runtime/needs-gate.stderr
@@ -6,6 +6,7 @@ LL | #![panic_runtime]
    |
    = note: see issue #32837 <https://github.com/rust-lang/rust/issues/32837> for more information
    = help: add `#![feature(panic_runtime)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: the `#[needs_panic_runtime]` attribute is an experimental feature
   --> $DIR/needs-gate.rs:5:1
@@ -15,6 +16,7 @@ LL | #![needs_panic_runtime]
    |
    = note: see issue #32837 <https://github.com/rust-lang/rust/issues/32837> for more information
    = help: add `#![feature(needs_panic_runtime)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/parser/constraints-before-generic-args-syntactic-pass.stderr b/tests/ui/parser/constraints-before-generic-args-syntactic-pass.stderr
index 7e843c7f4d006..393ed704b4197 100644
--- a/tests/ui/parser/constraints-before-generic-args-syntactic-pass.stderr
+++ b/tests/ui/parser/constraints-before-generic-args-syntactic-pass.stderr
@@ -6,6 +6,7 @@ LL |     foo::<T = u8, T: Ord, String>();
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = warning: unstable syntax can change at any point in the future, causing a hard error!
    = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
 
@@ -17,6 +18,7 @@ LL |     foo::<T = u8, 'a, T: Ord>();
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = warning: unstable syntax can change at any point in the future, causing a hard error!
    = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
 
diff --git a/tests/ui/parser/impl-item-type-no-body-semantic-fail.stderr b/tests/ui/parser/impl-item-type-no-body-semantic-fail.stderr
index 5bcbbb9deb754..d23e6027473d1 100644
--- a/tests/ui/parser/impl-item-type-no-body-semantic-fail.stderr
+++ b/tests/ui/parser/impl-item-type-no-body-semantic-fail.stderr
@@ -50,6 +50,7 @@ LL |     type Y;
    |
    = note: see issue #8995 <https://github.com/rust-lang/rust/issues/8995> for more information
    = help: add `#![feature(inherent_associated_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: inherent associated types are unstable
   --> $DIR/impl-item-type-no-body-semantic-fail.rs:9:5
@@ -59,6 +60,7 @@ LL |     type Z: Ord;
    |
    = note: see issue #8995 <https://github.com/rust-lang/rust/issues/8995> for more information
    = help: add `#![feature(inherent_associated_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: inherent associated types are unstable
   --> $DIR/impl-item-type-no-body-semantic-fail.rs:13:5
@@ -68,6 +70,7 @@ LL |     type W: Ord where Self: Eq;
    |
    = note: see issue #8995 <https://github.com/rust-lang/rust/issues/8995> for more information
    = help: add `#![feature(inherent_associated_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: inherent associated types are unstable
   --> $DIR/impl-item-type-no-body-semantic-fail.rs:17:5
@@ -77,6 +80,7 @@ LL |     type W where Self: Eq;
    |
    = note: see issue #8995 <https://github.com/rust-lang/rust/issues/8995> for more information
    = help: add `#![feature(inherent_associated_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0592]: duplicate definitions with name `W`
   --> $DIR/impl-item-type-no-body-semantic-fail.rs:17:5
diff --git a/tests/ui/parser/issues/issue-118531-ice.stderr b/tests/ui/parser/issues/issue-118531-ice.stderr
index a32292dcb0de5..68c7ad47b9dec 100644
--- a/tests/ui/parser/issues/issue-118531-ice.stderr
+++ b/tests/ui/parser/issues/issue-118531-ice.stderr
@@ -26,6 +26,7 @@ LL |     #[attr]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: cannot find attribute `attr` in this scope
   --> $DIR/issue-118531-ice.rs:5:7
diff --git a/tests/ui/parser/recover/recover-assoc-const-constraint.stderr b/tests/ui/parser/recover/recover-assoc-const-constraint.stderr
index 2d36ce4e98632..02b1c3fe68a92 100644
--- a/tests/ui/parser/recover/recover-assoc-const-constraint.stderr
+++ b/tests/ui/parser/recover/recover-assoc-const-constraint.stderr
@@ -6,6 +6,7 @@ LL |     bar::<Item = 42>();
    |
    = note: see issue #92827 <https://github.com/rust-lang/rust/issues/92827> for more information
    = help: add `#![feature(associated_const_equality)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: associated const equality is incomplete
   --> $DIR/recover-assoc-const-constraint.rs:5:11
@@ -15,6 +16,7 @@ LL |     bar::<Item = { 42 }>();
    |
    = note: see issue #92827 <https://github.com/rust-lang/rust/issues/92827> for more information
    = help: add `#![feature(associated_const_equality)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/parser/recover/recover-quantified-closure.stderr b/tests/ui/parser/recover/recover-quantified-closure.stderr
index 37e93cbee7be7..6e03bbb586959 100644
--- a/tests/ui/parser/recover/recover-quantified-closure.stderr
+++ b/tests/ui/parser/recover/recover-quantified-closure.stderr
@@ -12,6 +12,7 @@ LL |     for<'a> |x: &'a u8| *x + 1;
    |
    = note: see issue #97362 <https://github.com/rust-lang/rust/issues/97362> for more information
    = help: add `#![feature(closure_lifetime_binder)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: consider removing `for<...>`
 
 error[E0658]: `for<...>` binders for closures are experimental
@@ -22,6 +23,7 @@ LL |     for <Foo>::Bar in x {}
    |
    = note: see issue #97362 <https://github.com/rust-lang/rust/issues/97362> for more information
    = help: add `#![feature(closure_lifetime_binder)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: consider removing `for<...>`
 
 error: implicit types in closure signatures are forbidden when `for<...>` is present
diff --git a/tests/ui/pattern/range-pattern-meant-to-be-slice-rest-pattern.stderr b/tests/ui/pattern/range-pattern-meant-to-be-slice-rest-pattern.stderr
index cddd01212798e..c3c9131b63eb2 100644
--- a/tests/ui/pattern/range-pattern-meant-to-be-slice-rest-pattern.stderr
+++ b/tests/ui/pattern/range-pattern-meant-to-be-slice-rest-pattern.stderr
@@ -23,6 +23,7 @@ LL |         [1, rest..] => println!("{rest:?}"),
    |
    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
    = help: add `#![feature(half_open_range_patterns_in_slices)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/pattern/rest-pat-syntactic.stderr b/tests/ui/pattern/rest-pat-syntactic.stderr
index 37019b7d5ba7a..4de2730518905 100644
--- a/tests/ui/pattern/rest-pat-syntactic.stderr
+++ b/tests/ui/pattern/rest-pat-syntactic.stderr
@@ -6,6 +6,7 @@ LL |     let box ..;
    |
    = note: see issue #29641 <https://github.com/rust-lang/rust/issues/29641> for more information
    = help: add `#![feature(box_patterns)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = warning: unstable syntax can change at any point in the future, causing a hard error!
    = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
 
@@ -17,6 +18,7 @@ LL |                 box ..,
    |
    = note: see issue #29641 <https://github.com/rust-lang/rust/issues/29641> for more information
    = help: add `#![feature(box_patterns)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = warning: unstable syntax can change at any point in the future, causing a hard error!
    = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
 
diff --git a/tests/ui/pattern/usefulness/issue-119493-type-error-ice.stderr b/tests/ui/pattern/usefulness/issue-119493-type-error-ice.stderr
index 6d74feb7a9f3f..1c560aa2ca813 100644
--- a/tests/ui/pattern/usefulness/issue-119493-type-error-ice.stderr
+++ b/tests/ui/pattern/usefulness/issue-119493-type-error-ice.stderr
@@ -23,6 +23,7 @@ LL |     type U = impl Copy;
    |
    = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
    = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/pattern/usefulness/issue-119778-type-error-ice.stderr b/tests/ui/pattern/usefulness/issue-119778-type-error-ice.stderr
index 93ef05decd26f..7da384d613efb 100644
--- a/tests/ui/pattern/usefulness/issue-119778-type-error-ice.stderr
+++ b/tests/ui/pattern/usefulness/issue-119778-type-error-ice.stderr
@@ -28,6 +28,7 @@ LL |     type U = impl Copy;
    |
    = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
    = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/pin-macro/cant_access_internals.stderr b/tests/ui/pin-macro/cant_access_internals.stderr
index 9af1cd2a16c93..2737b84f5995b 100644
--- a/tests/ui/pin-macro/cant_access_internals.stderr
+++ b/tests/ui/pin-macro/cant_access_internals.stderr
@@ -5,6 +5,7 @@ LL |     mem::take(phantom_pinned.pointer);
    |               ^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unsafe_pin_internals)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/proc-macro/attr-stmt-expr.stderr b/tests/ui/proc-macro/attr-stmt-expr.stderr
index 56178259d4352..92edc44b27817 100644
--- a/tests/ui/proc-macro/attr-stmt-expr.stderr
+++ b/tests/ui/proc-macro/attr-stmt-expr.stderr
@@ -6,6 +6,7 @@ LL |     #[expect_my_macro_expr]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
   --> $DIR/attr-stmt-expr.rs:62:5
@@ -15,6 +16,7 @@ LL |     #[expect_expr]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/proc-macro/attributes-on-modules-fail.stderr b/tests/ui/proc-macro/attributes-on-modules-fail.stderr
index 97521f23aeef3..e69ab78723861 100644
--- a/tests/ui/proc-macro/attributes-on-modules-fail.stderr
+++ b/tests/ui/proc-macro/attributes-on-modules-fail.stderr
@@ -14,6 +14,7 @@ LL | mod module;
    |
    = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
    = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: non-inline modules in proc macro input are unstable
   --> $DIR/attributes-on-modules-fail.rs:24:5
@@ -23,6 +24,7 @@ LL |     mod inner;
    |
    = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
    = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: non-inline modules in proc macro input are unstable
   --> $DIR/attributes-on-modules-fail.rs:33:9
@@ -32,6 +34,7 @@ LL |         mod inner;
    |
    = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
    = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: non-inline modules in proc macro input are unstable
   --> $DIR/attributes-on-modules-fail.rs:42:5
@@ -41,6 +44,7 @@ LL |     mod inner;
    |
    = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
    = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0412]: cannot find type `Y` in this scope
   --> $DIR/attributes-on-modules-fail.rs:10:14
diff --git a/tests/ui/proc-macro/expand-to-unstable.stderr b/tests/ui/proc-macro/expand-to-unstable.stderr
index dda590ee8c7e8..9eb701d970256 100644
--- a/tests/ui/proc-macro/expand-to-unstable.stderr
+++ b/tests/ui/proc-macro/expand-to-unstable.stderr
@@ -5,6 +5,7 @@ LL | #[derive(Unstable)]
    |          ^^^^^^^^
    |
    = help: add `#![feature(core_intrinsics)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the derive macro `Unstable` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 1 previous error
diff --git a/tests/ui/proc-macro/inner-attr-non-inline-mod.stderr b/tests/ui/proc-macro/inner-attr-non-inline-mod.stderr
index 36825e5a39844..ccc967aaff971 100644
--- a/tests/ui/proc-macro/inner-attr-non-inline-mod.stderr
+++ b/tests/ui/proc-macro/inner-attr-non-inline-mod.stderr
@@ -6,6 +6,7 @@ LL | #![print_attr]
    |
    = note: see issue #54726 <https://github.com/rust-lang/rust/issues/54726> for more information
    = help: add `#![feature(custom_inner_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: non-inline modules in proc macro input are unstable
   --> $DIR/inner-attr-non-inline-mod.rs:14:1
@@ -15,6 +16,7 @@ LL | mod module_with_attrs;
    |
    = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
    = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: custom inner attributes are unstable
   --> $DIR/inner-attr-non-inline-mod.rs:14:1
@@ -24,6 +26,7 @@ LL | mod module_with_attrs;
    |
    = note: see issue #54726 <https://github.com/rust-lang/rust/issues/54726> for more information
    = help: add `#![feature(custom_inner_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: custom inner attributes are unstable
   --> $DIR/module_with_attrs.rs:3:4
diff --git a/tests/ui/proc-macro/issue-83510.stderr b/tests/ui/proc-macro/issue-83510.stderr
index e0628a317918b..e59b77af3dc39 100644
--- a/tests/ui/proc-macro/issue-83510.stderr
+++ b/tests/ui/proc-macro/issue-83510.stderr
@@ -30,6 +30,7 @@ LL | issue_83510::dance_like_you_want_to_ice!();
    |
    = note: see issue #8995 <https://github.com/rust-lang/rust/issues/8995> for more information
    = help: add `#![feature(inherent_associated_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: this error originates in the macro `issue_83510::dance_like_you_want_to_ice` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 4 previous errors
diff --git a/tests/ui/proc-macro/proc-macro-gates.stderr b/tests/ui/proc-macro/proc-macro-gates.stderr
index ab98784bfbd1e..a05a7d0b185e6 100644
--- a/tests/ui/proc-macro/proc-macro-gates.stderr
+++ b/tests/ui/proc-macro/proc-macro-gates.stderr
@@ -6,6 +6,7 @@ LL |     #![empty_attr]
    |
    = note: see issue #54726 <https://github.com/rust-lang/rust/issues/54726> for more information
    = help: add `#![feature(custom_inner_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: inner macro attributes are unstable
   --> $DIR/proc-macro-gates.rs:14:8
@@ -15,6 +16,7 @@ LL |     #![empty_attr]
    |
    = note: see issue #54726 <https://github.com/rust-lang/rust/issues/54726> for more information
    = help: add `#![feature(custom_inner_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: key-value macro attributes are not supported
   --> $DIR/proc-macro-gates.rs:17:1
@@ -30,6 +32,7 @@ LL |     #[empty_attr]
    |
    = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
    = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: custom attributes cannot be applied to statements
   --> $DIR/proc-macro-gates.rs:30:5
@@ -39,6 +42,7 @@ LL |     #[empty_attr]
    |
    = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
    = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: custom attributes cannot be applied to statements
   --> $DIR/proc-macro-gates.rs:34:5
@@ -48,6 +52,7 @@ LL |     #[empty_attr]
    |
    = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
    = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: custom attributes cannot be applied to expressions
   --> $DIR/proc-macro-gates.rs:38:14
@@ -57,6 +62,7 @@ LL |     let _x = #[identity_attr] 2;
    |
    = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
    = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: custom attributes cannot be applied to expressions
   --> $DIR/proc-macro-gates.rs:41:15
@@ -66,6 +72,7 @@ LL |     let _x = [#[identity_attr] 2];
    |
    = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
    = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: custom attributes cannot be applied to expressions
   --> $DIR/proc-macro-gates.rs:44:14
@@ -75,6 +82,7 @@ LL |     let _x = #[identity_attr] println!();
    |
    = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
    = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: inner macro attributes are unstable
   --> $DIR/proc-macro-gates.rs:49:8
diff --git a/tests/ui/raw-ref-op/feature-raw-ref-op.stderr b/tests/ui/raw-ref-op/feature-raw-ref-op.stderr
index 1e5fd84ff7119..4ffd0c90e48b3 100644
--- a/tests/ui/raw-ref-op/feature-raw-ref-op.stderr
+++ b/tests/ui/raw-ref-op/feature-raw-ref-op.stderr
@@ -6,6 +6,7 @@ LL |     &raw const a;
    |
    = note: see issue #64490 <https://github.com/rust-lang/rust/issues/64490> for more information
    = help: add `#![feature(raw_ref_op)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: raw address of syntax is experimental
   --> $DIR/feature-raw-ref-op.rs:14:5
@@ -15,6 +16,7 @@ LL |     &raw mut a;
    |
    = note: see issue #64490 <https://github.com/rust-lang/rust/issues/64490> for more information
    = help: add `#![feature(raw_ref_op)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: raw address of syntax is experimental
   --> $DIR/feature-raw-ref-op.rs:19:13
@@ -24,6 +26,7 @@ LL |     let x = &raw const y;
    |
    = note: see issue #64490 <https://github.com/rust-lang/rust/issues/64490> for more information
    = help: add `#![feature(raw_ref_op)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: raw address of syntax is experimental
   --> $DIR/feature-raw-ref-op.rs:20:13
@@ -33,6 +36,7 @@ LL |     let x = &raw mut y;
    |
    = note: see issue #64490 <https://github.com/rust-lang/rust/issues/64490> for more information
    = help: add `#![feature(raw_ref_op)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: raw address of syntax is experimental
   --> $DIR/feature-raw-ref-op.rs:7:10
@@ -42,6 +46,7 @@ LL | is_expr!(&raw const a);
    |
    = note: see issue #64490 <https://github.com/rust-lang/rust/issues/64490> for more information
    = help: add `#![feature(raw_ref_op)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: raw address of syntax is experimental
   --> $DIR/feature-raw-ref-op.rs:8:10
@@ -51,6 +56,7 @@ LL | is_expr!(&raw mut a);
    |
    = note: see issue #64490 <https://github.com/rust-lang/rust/issues/64490> for more information
    = help: add `#![feature(raw_ref_op)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 6 previous errors
 
diff --git a/tests/ui/repr/explicit-rust-repr-conflicts.stderr b/tests/ui/repr/explicit-rust-repr-conflicts.stderr
index 7126da574b632..30b667f5f2be3 100644
--- a/tests/ui/repr/explicit-rust-repr-conflicts.stderr
+++ b/tests/ui/repr/explicit-rust-repr-conflicts.stderr
@@ -6,6 +6,7 @@ LL | #[repr(Rust, simd)]
    |
    = note: see issue #27731 <https://github.com/rust-lang/rust/issues/27731> for more information
    = help: add `#![feature(repr_simd)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0566]: conflicting representation hints
   --> $DIR/explicit-rust-repr-conflicts.rs:1:8
diff --git a/tests/ui/rfcs/rfc-0000-never_patterns/ICE-119271-never-arm-attr-in-guard.stderr b/tests/ui/rfcs/rfc-0000-never_patterns/ICE-119271-never-arm-attr-in-guard.stderr
index 335e6c6db5f74..a456b686e56e3 100644
--- a/tests/ui/rfcs/rfc-0000-never_patterns/ICE-119271-never-arm-attr-in-guard.stderr
+++ b/tests/ui/rfcs/rfc-0000-never_patterns/ICE-119271-never-arm-attr-in-guard.stderr
@@ -6,6 +6,7 @@ LL |             if #[deny(unused_mut)]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `!` patterns are experimental
   --> $DIR/ICE-119271-never-arm-attr-in-guard.rs:5:14
@@ -15,6 +16,7 @@ LL |         Some(!)
    |
    = note: see issue #118155 <https://github.com/rust-lang/rust/issues/118155> for more information
    = help: add `#![feature(never_patterns)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: a guard on a never pattern will never be run
   --> $DIR/ICE-119271-never-arm-attr-in-guard.rs:7:13
diff --git a/tests/ui/rfcs/rfc-1445-restrict-constants-in-patterns/feature-gate.no_gate.stderr b/tests/ui/rfcs/rfc-1445-restrict-constants-in-patterns/feature-gate.no_gate.stderr
index bd294047919f1..f047afa985d5f 100644
--- a/tests/ui/rfcs/rfc-1445-restrict-constants-in-patterns/feature-gate.no_gate.stderr
+++ b/tests/ui/rfcs/rfc-1445-restrict-constants-in-patterns/feature-gate.no_gate.stderr
@@ -6,6 +6,7 @@ LL | impl std::marker::StructuralPartialEq for Foo { }
    |
    = note: see issue #31434 <https://github.com/rust-lang/rust/issues/31434> for more information
    = help: add `#![feature(structural_match)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'structural_match'
   --> $DIR/feature-gate.rs:31:6
@@ -15,6 +16,7 @@ LL | impl std::marker::StructuralEq for Foo { }
    |
    = note: see issue #31434 <https://github.com/rust-lang/rust/issues/31434> for more information
    = help: add `#![feature(structural_match)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/rfcs/rfc-2294-if-let-guard/feature-gate.stderr b/tests/ui/rfcs/rfc-2294-if-let-guard/feature-gate.stderr
index 62534b555b270..2341dbbbdbd00 100644
--- a/tests/ui/rfcs/rfc-2294-if-let-guard/feature-gate.stderr
+++ b/tests/ui/rfcs/rfc-2294-if-let-guard/feature-gate.stderr
@@ -154,6 +154,7 @@ LL |         () if let 0 = 1 => {}
    |
    = note: see issue #51114 <https://github.com/rust-lang/rust/issues/51114> for more information
    = help: add `#![feature(if_let_guard)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: you can write `if matches!(<expr>, <pattern>)` instead of `if let <pattern> = <expr>`
 
 error[E0658]: `if let` guards are experimental
@@ -164,6 +165,7 @@ LL |         () if true && let 0 = 1 => {}
    |
    = note: see issue #51114 <https://github.com/rust-lang/rust/issues/51114> for more information
    = help: add `#![feature(if_let_guard)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: you can write `if matches!(<expr>, <pattern>)` instead of `if let <pattern> = <expr>`
 
 error[E0658]: `if let` guards are experimental
@@ -174,6 +176,7 @@ LL |         () if let 0 = 1 && true => {}
    |
    = note: see issue #51114 <https://github.com/rust-lang/rust/issues/51114> for more information
    = help: add `#![feature(if_let_guard)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: you can write `if matches!(<expr>, <pattern>)` instead of `if let <pattern> = <expr>`
 
 error[E0658]: `if let` guards are experimental
@@ -184,6 +187,7 @@ LL |         () if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 =
    |
    = note: see issue #51114 <https://github.com/rust-lang/rust/issues/51114> for more information
    = help: add `#![feature(if_let_guard)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: you can write `if matches!(<expr>, <pattern>)` instead of `if let <pattern> = <expr>`
 
 error[E0658]: `if let` guards are experimental
@@ -194,6 +198,7 @@ LL |         () if let Range { start: _, end: _ } = (true..true) && false => {}
    |
    = note: see issue #51114 <https://github.com/rust-lang/rust/issues/51114> for more information
    = help: add `#![feature(if_let_guard)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: you can write `if matches!(<expr>, <pattern>)` instead of `if let <pattern> = <expr>`
 
 error[E0658]: `if let` guards are experimental
@@ -204,6 +209,7 @@ LL |         () if let 0 = 1 => {}
    |
    = note: see issue #51114 <https://github.com/rust-lang/rust/issues/51114> for more information
    = help: add `#![feature(if_let_guard)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: you can write `if matches!(<expr>, <pattern>)` instead of `if let <pattern> = <expr>`
 
 error[E0658]: `let` expressions in this position are unstable
@@ -214,6 +220,7 @@ LL |         () if true && let 0 = 1 => {}
    |
    = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
    = help: add `#![feature(let_chains)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `let` expressions in this position are unstable
   --> $DIR/feature-gate.rs:20:15
@@ -223,6 +230,7 @@ LL |         () if let 0 = 1 && true => {}
    |
    = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
    = help: add `#![feature(let_chains)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `let` expressions in this position are unstable
   --> $DIR/feature-gate.rs:34:15
@@ -232,6 +240,7 @@ LL |         () if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 =
    |
    = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
    = help: add `#![feature(let_chains)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `let` expressions in this position are unstable
   --> $DIR/feature-gate.rs:34:28
@@ -241,6 +250,7 @@ LL |         () if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 =
    |
    = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
    = help: add `#![feature(let_chains)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `let` expressions in this position are unstable
   --> $DIR/feature-gate.rs:43:15
@@ -250,6 +260,7 @@ LL |         () if let Range { start: _, end: _ } = (true..true) && false => {}
    |
    = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
    = help: add `#![feature(let_chains)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 23 previous errors
 
diff --git a/tests/ui/rfcs/rfc-2396-target_feature-11/feature-gate-target_feature_11.stderr b/tests/ui/rfcs/rfc-2396-target_feature-11/feature-gate-target_feature_11.stderr
index 06c6c90533893..4f1994d56fd42 100644
--- a/tests/ui/rfcs/rfc-2396-target_feature-11/feature-gate-target_feature_11.stderr
+++ b/tests/ui/rfcs/rfc-2396-target_feature-11/feature-gate-target_feature_11.stderr
@@ -8,6 +8,7 @@ LL | fn foo() {}
    |
    = note: see issue #69098 <https://github.com/rust-lang/rust/issues/69098> for more information
    = help: add `#![feature(target_feature_11)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/rfcs/rfc-2397-do-not-recommend/unstable-feature.stderr b/tests/ui/rfcs/rfc-2397-do-not-recommend/unstable-feature.stderr
index b2c1406d09397..02bc51ccd3f58 100644
--- a/tests/ui/rfcs/rfc-2397-do-not-recommend/unstable-feature.stderr
+++ b/tests/ui/rfcs/rfc-2397-do-not-recommend/unstable-feature.stderr
@@ -6,6 +6,7 @@ LL | #[do_not_recommend]
    |
    = note: see issue #51992 <https://github.com/rust-lang/rust/issues/51992> for more information
    = help: add `#![feature(do_not_recommend)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/rfcs/rfc-2497-if-let-chains/feature-gate.stderr b/tests/ui/rfcs/rfc-2497-if-let-chains/feature-gate.stderr
index 6f74736755e6d..2b1a49be3daa5 100644
--- a/tests/ui/rfcs/rfc-2497-if-let-chains/feature-gate.stderr
+++ b/tests/ui/rfcs/rfc-2497-if-let-chains/feature-gate.stderr
@@ -37,6 +37,7 @@ LL |     if true && let 0 = 1 {}
    |
    = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
    = help: add `#![feature(let_chains)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `let` expressions in this position are unstable
   --> $DIR/feature-gate.rs:17:8
@@ -46,6 +47,7 @@ LL |     if let 0 = 1 && true {}
    |
    = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
    = help: add `#![feature(let_chains)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `let` expressions in this position are unstable
   --> $DIR/feature-gate.rs:20:8
@@ -55,6 +57,7 @@ LL |     if let Range { start: _, end: _ } = (true..true) && false {}
    |
    = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
    = help: add `#![feature(let_chains)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `let` expressions in this position are unstable
   --> $DIR/feature-gate.rs:23:8
@@ -64,6 +67,7 @@ LL |     if let 1 = 1 && let true = { true } && false {
    |
    = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
    = help: add `#![feature(let_chains)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `let` expressions in this position are unstable
   --> $DIR/feature-gate.rs:23:21
@@ -73,6 +77,7 @@ LL |     if let 1 = 1 && let true = { true } && false {
    |
    = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
    = help: add `#![feature(let_chains)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `let` expressions in this position are unstable
   --> $DIR/feature-gate.rs:32:19
@@ -82,6 +87,7 @@ LL |     while true && let 0 = 1 {}
    |
    = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
    = help: add `#![feature(let_chains)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `let` expressions in this position are unstable
   --> $DIR/feature-gate.rs:35:11
@@ -91,6 +97,7 @@ LL |     while let 0 = 1 && true {}
    |
    = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
    = help: add `#![feature(let_chains)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `let` expressions in this position are unstable
   --> $DIR/feature-gate.rs:38:11
@@ -100,6 +107,7 @@ LL |     while let Range { start: _, end: _ } = (true..true) && false {}
    |
    = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
    = help: add `#![feature(let_chains)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 11 previous errors
 
diff --git a/tests/ui/rfcs/rfc-2497-if-let-chains/issue-93150.stderr b/tests/ui/rfcs/rfc-2497-if-let-chains/issue-93150.stderr
index b25f299a2190f..637ae4915ed14 100644
--- a/tests/ui/rfcs/rfc-2497-if-let-chains/issue-93150.stderr
+++ b/tests/ui/rfcs/rfc-2497-if-let-chains/issue-93150.stderr
@@ -6,6 +6,7 @@ LL |         _ if let true = true && true => {}
    |
    = note: see issue #51114 <https://github.com/rust-lang/rust/issues/51114> for more information
    = help: add `#![feature(if_let_guard)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: you can write `if matches!(<expr>, <pattern>)` instead of `if let <pattern> = <expr>`
 
 error[E0658]: `let` expressions in this position are unstable
@@ -16,6 +17,7 @@ LL |         _ if let true = true && true => {}
    |
    = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
    = help: add `#![feature(let_chains)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/rfcs/rfc-2528-type-changing-struct-update/feature-gate.stderr b/tests/ui/rfcs/rfc-2528-type-changing-struct-update/feature-gate.stderr
index 48e46d3d1d1aa..b67327f3af785 100644
--- a/tests/ui/rfcs/rfc-2528-type-changing-struct-update/feature-gate.stderr
+++ b/tests/ui/rfcs/rfc-2528-type-changing-struct-update/feature-gate.stderr
@@ -6,6 +6,7 @@ LL |         ..m1
    |
    = note: see issue #86555 <https://github.com/rust-lang/rust/issues/86555> for more information
    = help: add `#![feature(type_changing_struct_update)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0308]: mismatched types
   --> $DIR/feature-gate.rs:22:11
diff --git a/tests/ui/rfcs/rfc-2632-const-trait-impl/const_derives/derive-const-gate.stderr b/tests/ui/rfcs/rfc-2632-const-trait-impl/const_derives/derive-const-gate.stderr
index 2dd96f548fed3..9ec2ac9338175 100644
--- a/tests/ui/rfcs/rfc-2632-const-trait-impl/const_derives/derive-const-gate.stderr
+++ b/tests/ui/rfcs/rfc-2632-const-trait-impl/const_derives/derive-const-gate.stderr
@@ -5,6 +5,7 @@ LL | #[derive_const(Default)]
    |   ^^^^^^^^^^^^
    |
    = help: add `#![feature(derive_const)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/rfcs/rfc-2632-const-trait-impl/effects/ice-112822-expected-type-for-param.stderr b/tests/ui/rfcs/rfc-2632-const-trait-impl/effects/ice-112822-expected-type-for-param.stderr
index 7e268f50dca33..0f6240cc03b80 100644
--- a/tests/ui/rfcs/rfc-2632-const-trait-impl/effects/ice-112822-expected-type-for-param.stderr
+++ b/tests/ui/rfcs/rfc-2632-const-trait-impl/effects/ice-112822-expected-type-for-param.stderr
@@ -6,6 +6,7 @@ LL |     const move || {
    |
    = note: see issue #106003 <https://github.com/rust-lang/rust/issues/106003> for more information
    = help: add `#![feature(const_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: `~const` can only be applied to `#[const_trait]` traits
   --> $DIR/ice-112822-expected-type-for-param.rs:3:32
diff --git a/tests/ui/rfcs/rfc-2632-const-trait-impl/feature-gate.stock.stderr b/tests/ui/rfcs/rfc-2632-const-trait-impl/feature-gate.stock.stderr
index c9826aeb1665f..78157d5705638 100644
--- a/tests/ui/rfcs/rfc-2632-const-trait-impl/feature-gate.stock.stderr
+++ b/tests/ui/rfcs/rfc-2632-const-trait-impl/feature-gate.stock.stderr
@@ -6,6 +6,7 @@ LL | impl const T for S {}
    |
    = note: see issue #67792 <https://github.com/rust-lang/rust/issues/67792> for more information
    = help: add `#![feature(const_trait_impl)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: const trait impls are experimental
   --> $DIR/feature-gate.rs:13:15
@@ -15,6 +16,7 @@ LL | const fn f<A: ~const T>() {}
    |
    = note: see issue #67792 <https://github.com/rust-lang/rust/issues/67792> for more information
    = help: add `#![feature(const_trait_impl)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: const trait impls are experimental
   --> $DIR/feature-gate.rs:14:9
@@ -24,6 +26,7 @@ LL | fn g<A: const T>() {}
    |
    = note: see issue #67792 <https://github.com/rust-lang/rust/issues/67792> for more information
    = help: add `#![feature(const_trait_impl)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: const trait impls are experimental
   --> $DIR/feature-gate.rs:18:17
@@ -33,6 +36,7 @@ LL | discard! { impl ~const T }
    |
    = note: see issue #67792 <https://github.com/rust-lang/rust/issues/67792> for more information
    = help: add `#![feature(const_trait_impl)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: const trait impls are experimental
   --> $DIR/feature-gate.rs:19:17
@@ -42,6 +46,7 @@ LL | discard! { impl const T }
    |
    = note: see issue #67792 <https://github.com/rust-lang/rust/issues/67792> for more information
    = help: add `#![feature(const_trait_impl)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `const_trait` is a temporary placeholder for marking a trait that is suitable for `const` `impls` and all default bodies as `const`, which may be removed or renamed in the future.
   --> $DIR/feature-gate.rs:8:1
@@ -51,6 +56,7 @@ LL | #[const_trait]
    |
    = note: see issue #67792 <https://github.com/rust-lang/rust/issues/67792> for more information
    = help: add `#![feature(const_trait_impl)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 6 previous errors
 
diff --git a/tests/ui/rfcs/rfc-2632-const-trait-impl/gate.stderr b/tests/ui/rfcs/rfc-2632-const-trait-impl/gate.stderr
index 11cc2cd569a43..19fd54ff36983 100644
--- a/tests/ui/rfcs/rfc-2632-const-trait-impl/gate.stderr
+++ b/tests/ui/rfcs/rfc-2632-const-trait-impl/gate.stderr
@@ -6,6 +6,7 @@ LL |     (const || {})();
    |
    = note: see issue #106003 <https://github.com/rust-lang/rust/issues/106003> for more information
    = help: add `#![feature(const_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: const closures are experimental
   --> $DIR/gate.rs:12:5
@@ -15,6 +16,7 @@ LL | e!((const || {}));
    |
    = note: see issue #106003 <https://github.com/rust-lang/rust/issues/106003> for more information
    = help: add `#![feature(const_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/rfcs/rfc-2632-const-trait-impl/hir-const-check.stderr b/tests/ui/rfcs/rfc-2632-const-trait-impl/hir-const-check.stderr
index 90f30ea635f1e..5b14ef46d25d3 100644
--- a/tests/ui/rfcs/rfc-2632-const-trait-impl/hir-const-check.stderr
+++ b/tests/ui/rfcs/rfc-2632-const-trait-impl/hir-const-check.stderr
@@ -6,6 +6,7 @@ LL |         Some(())?;
    |
    = note: see issue #74935 <https://github.com/rust-lang/rust/issues/74935> for more information
    = help: add `#![feature(const_try)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/rfcs/rfc-2632-const-trait-impl/mbe-const-trait-bound-theoretical-regression.stderr b/tests/ui/rfcs/rfc-2632-const-trait-impl/mbe-const-trait-bound-theoretical-regression.stderr
index 254d31930b366..fd9184b9dff32 100644
--- a/tests/ui/rfcs/rfc-2632-const-trait-impl/mbe-const-trait-bound-theoretical-regression.stderr
+++ b/tests/ui/rfcs/rfc-2632-const-trait-impl/mbe-const-trait-bound-theoretical-regression.stderr
@@ -24,6 +24,7 @@ LL | demo! { dyn const }
    |
    = note: see issue #67792 <https://github.com/rust-lang/rust/issues/67792> for more information
    = help: add `#![feature(const_trait_impl)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/rfcs/rfc-2632-const-trait-impl/tilde-const-invalid-places.stderr b/tests/ui/rfcs/rfc-2632-const-trait-impl/tilde-const-invalid-places.stderr
index a54ba7a94b4aa..188a36af8c1be 100644
--- a/tests/ui/rfcs/rfc-2632-const-trait-impl/tilde-const-invalid-places.stderr
+++ b/tests/ui/rfcs/rfc-2632-const-trait-impl/tilde-const-invalid-places.stderr
@@ -214,6 +214,7 @@ LL | const CONSTANT<T: ~const Trait>: () = ();
    |
    = note: see issue #113521 <https://github.com/rust-lang/rust/issues/113521> for more information
    = help: add `#![feature(generic_const_items)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: generic const items are experimental
   --> $DIR/tilde-const-invalid-places.rs:29:19
@@ -223,6 +224,7 @@ LL |     const CONSTANT<T: ~const Trait>: ();
    |
    = note: see issue #113521 <https://github.com/rust-lang/rust/issues/113521> for more information
    = help: add `#![feature(generic_const_items)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: generic const items are experimental
   --> $DIR/tilde-const-invalid-places.rs:37:19
@@ -232,6 +234,7 @@ LL |     const CONSTANT<T: ~const Trait>: () = ();
    |
    = note: see issue #113521 <https://github.com/rust-lang/rust/issues/113521> for more information
    = help: add `#![feature(generic_const_items)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: generic const items are experimental
   --> $DIR/tilde-const-invalid-places.rs:47:19
@@ -241,6 +244,7 @@ LL |     const CONSTANT<T: ~const Trait>: () = ();
    |
    = note: see issue #113521 <https://github.com/rust-lang/rust/issues/113521> for more information
    = help: add `#![feature(generic_const_items)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: inherent associated types are unstable
   --> $DIR/tilde-const-invalid-places.rs:44:5
@@ -250,6 +254,7 @@ LL |     type Type<T: ~const Trait> = ();
    |
    = note: see issue #8995 <https://github.com/rust-lang/rust/issues/8995> for more information
    = help: add `#![feature(inherent_associated_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0392]: parameter `T` is never used
   --> $DIR/tilde-const-invalid-places.rs:11:19
diff --git a/tests/ui/rustdoc/feature-gate-doc_primitive.stderr b/tests/ui/rustdoc/feature-gate-doc_primitive.stderr
index 0f5665f1fb9d8..e74b1322b2597 100644
--- a/tests/ui/rustdoc/feature-gate-doc_primitive.stderr
+++ b/tests/ui/rustdoc/feature-gate-doc_primitive.stderr
@@ -5,6 +5,7 @@ LL | #[rustc_doc_primitive = "usize"]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/self/arbitrary-self-from-method-substs.default.stderr b/tests/ui/self/arbitrary-self-from-method-substs.default.stderr
index a415aa3d7b49e..4cc69666b8876 100644
--- a/tests/ui/self/arbitrary-self-from-method-substs.default.stderr
+++ b/tests/ui/self/arbitrary-self-from-method-substs.default.stderr
@@ -6,6 +6,7 @@ LL |     fn get<R: Deref<Target = Self>>(self: R) -> u32 {
    |
    = note: see issue #44874 <https://github.com/rust-lang/rust/issues/44874> for more information
    = help: add `#![feature(arbitrary_self_types)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: consider changing to `self`, `&self`, `&mut self`, `self: Box<Self>`, `self: Rc<Self>`, `self: Arc<Self>`, or `self: Pin<P>` (where P is one of the previous types except `Self`)
 
 error: aborting due to 1 previous error
diff --git a/tests/ui/span/gated-features-attr-spans.stderr b/tests/ui/span/gated-features-attr-spans.stderr
index 5376d7799aaa6..f05c71774bd98 100644
--- a/tests/ui/span/gated-features-attr-spans.stderr
+++ b/tests/ui/span/gated-features-attr-spans.stderr
@@ -6,6 +6,7 @@ LL | #[repr(simd)]
    |
    = note: see issue #27731 <https://github.com/rust-lang/rust/issues/27731> for more information
    = help: add `#![feature(repr_simd)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/specialization/defaultimpl/specialization-feature-gate-default.stderr b/tests/ui/specialization/defaultimpl/specialization-feature-gate-default.stderr
index 18edcad0a47b5..e28d9c9fa836f 100644
--- a/tests/ui/specialization/defaultimpl/specialization-feature-gate-default.stderr
+++ b/tests/ui/specialization/defaultimpl/specialization-feature-gate-default.stderr
@@ -8,6 +8,7 @@ LL | | }
    |
    = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
    = help: add `#![feature(specialization)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/specialization/specialization-feature-gate-default.stderr b/tests/ui/specialization/specialization-feature-gate-default.stderr
index 35e5e3bc51253..3e651b6ee4f37 100644
--- a/tests/ui/specialization/specialization-feature-gate-default.stderr
+++ b/tests/ui/specialization/specialization-feature-gate-default.stderr
@@ -6,6 +6,7 @@ LL |     default fn foo(&self) {}
    |
    = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
    = help: add `#![feature(specialization)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/stability-attribute/accidental-stable-in-unstable.stderr b/tests/ui/stability-attribute/accidental-stable-in-unstable.stderr
index f85b3c6eb665e..4abf8243d2fca 100644
--- a/tests/ui/stability-attribute/accidental-stable-in-unstable.stderr
+++ b/tests/ui/stability-attribute/accidental-stable-in-unstable.stderr
@@ -5,6 +5,7 @@ LL | use core::unicode::UNICODE_VERSION;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unicode_internals)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/stability-attribute/allow-unstable-reexport.stderr b/tests/ui/stability-attribute/allow-unstable-reexport.stderr
index a11da9dc8a7be..af75b6afb049f 100644
--- a/tests/ui/stability-attribute/allow-unstable-reexport.stderr
+++ b/tests/ui/stability-attribute/allow-unstable-reexport.stderr
@@ -5,6 +5,7 @@ LL | pub use lint_stability::unstable as unstable2;
    |         ^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/allow-unstable-reexport.rs:28:5
@@ -13,6 +14,7 @@ LL |     unstable();
    |     ^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature': text
   --> $DIR/allow-unstable-reexport.rs:29:5
@@ -21,6 +23,7 @@ LL |     unstable_text();
    |     ^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/stability-attribute/allowed-through-unstable.stderr b/tests/ui/stability-attribute/allowed-through-unstable.stderr
index f09289bfb898f..5c8e6358b7c1c 100644
--- a/tests/ui/stability-attribute/allowed-through-unstable.stderr
+++ b/tests/ui/stability-attribute/allowed-through-unstable.stderr
@@ -6,6 +6,7 @@ LL | use allowed_through_unstable_core::unstable_module::NewStableTraitNotAllowe
    |
    = note: see issue #1 <https://github.com/rust-lang/rust/issues/1> for more information
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/stability-attribute/default-body-stability-err.stderr b/tests/ui/stability-attribute/default-body-stability-err.stderr
index 12ec9ea3adb41..9d8ad81f102f0 100644
--- a/tests/ui/stability-attribute/default-body-stability-err.stderr
+++ b/tests/ui/stability-attribute/default-body-stability-err.stderr
@@ -7,6 +7,7 @@ LL | impl JustTrait for Type {}
    = note: default implementation of `CONSTANT` is unstable
    = note: use of unstable library feature 'constant_default_body'
    = help: add `#![feature(constant_default_body)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0046]: not all trait items implemented, missing: `fun`
   --> $DIR/default-body-stability-err.rs:10:1
@@ -17,6 +18,7 @@ LL | impl JustTrait for Type {}
    = note: default implementation of `fun` is unstable
    = note: use of unstable library feature 'fun_default_body'
    = help: add `#![feature(fun_default_body)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0046]: not all trait items implemented, missing: `fun2`
   --> $DIR/default-body-stability-err.rs:10:1
@@ -27,6 +29,7 @@ LL | impl JustTrait for Type {}
    = note: default implementation of `fun2` is unstable
    = note: use of unstable library feature 'fun_default_body': reason
    = help: add `#![feature(fun_default_body)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0046]: not all trait items implemented, missing: `eq`
   --> $DIR/default-body-stability-err.rs:15:1
@@ -42,6 +45,7 @@ LL | | }
    = note: default implementation of `eq` is unstable
    = note: use of unstable library feature 'eq_default_body'
    = help: add `#![feature(eq_default_body)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 4 previous errors
 
diff --git a/tests/ui/stability-attribute/generics-default-stability-trait.stderr b/tests/ui/stability-attribute/generics-default-stability-trait.stderr
index 03e61b78e060f..699e7c83c70ee 100644
--- a/tests/ui/stability-attribute/generics-default-stability-trait.stderr
+++ b/tests/ui/stability-attribute/generics-default-stability-trait.stderr
@@ -5,6 +5,7 @@ LL | impl Trait1<usize> for S {
    |             ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability-trait.rs:20:13
@@ -13,6 +14,7 @@ LL | impl Trait1<isize> for S {
    |             ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability-trait.rs:24:13
@@ -21,6 +23,7 @@ LL | impl Trait2<usize> for S {
    |             ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/stability-attribute/generics-default-stability-where.stderr b/tests/ui/stability-attribute/generics-default-stability-where.stderr
index 16b560e8a4be5..8e4089970f56e 100644
--- a/tests/ui/stability-attribute/generics-default-stability-where.stderr
+++ b/tests/ui/stability-attribute/generics-default-stability-where.stderr
@@ -5,6 +5,7 @@ LL | impl<T> Trait3<usize> for T where T: Trait2<usize> {
    |                                             ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0210]: type parameter `T` must be used as the type parameter for some local type (e.g., `MyStruct<T>`)
   --> $DIR/generics-default-stability-where.rs:7:6
diff --git a/tests/ui/stability-attribute/generics-default-stability.stderr b/tests/ui/stability-attribute/generics-default-stability.stderr
index e094a10c8e7b4..b1b91a850e909 100644
--- a/tests/ui/stability-attribute/generics-default-stability.stderr
+++ b/tests/ui/stability-attribute/generics-default-stability.stderr
@@ -223,6 +223,7 @@ LL |     let _: Struct1<isize> = Struct1 { field: 1 };
    |                    ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:27:20
@@ -231,6 +232,7 @@ LL |     let _: Struct1<usize> = STRUCT1;
    |                    ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:28:20
@@ -239,6 +241,7 @@ LL |     let _: Struct1<isize> = Struct1 { field: 0 };
    |                    ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:57:27
@@ -247,6 +250,7 @@ LL |     let _: Struct3<isize, usize> = STRUCT3;
    |                           ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:59:27
@@ -255,6 +259,7 @@ LL |     let _: Struct3<isize, isize> = Struct3 { field1: 0, field2: 0 };
    |                           ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:60:27
@@ -263,6 +268,7 @@ LL |     let _: Struct3<usize, usize> = Struct3 { field1: 0, field2: 0 };
    |                           ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:84:20
@@ -271,6 +277,7 @@ LL |     let _: Struct5<isize> = Struct5 { field: 1 };
    |                    ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:90:20
@@ -279,6 +286,7 @@ LL |     let _: Struct5<usize> = STRUCT5;
    |                    ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:92:20
@@ -287,6 +295,7 @@ LL |     let _: Struct5<isize> = Struct5 { field: 0 };
    |                    ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:100:19
@@ -295,6 +304,7 @@ LL |     let _: Alias1<isize> = Alias1::Some(1);
    |                   ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:104:19
@@ -303,6 +313,7 @@ LL |     let _: Alias1<usize> = ALIAS1;
    |                   ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:105:19
@@ -311,6 +322,7 @@ LL |     let _: Alias1<isize> = Alias1::Some(0);
    |                   ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:133:26
@@ -319,6 +331,7 @@ LL |     let _: Alias3<isize, usize> = ALIAS3;
    |                          ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:135:26
@@ -327,6 +340,7 @@ LL |     let _: Alias3<isize, isize> = Alias3::Ok(0);
    |                          ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:136:26
@@ -335,6 +349,7 @@ LL |     let _: Alias3<usize, usize> = Alias3::Ok(0);
    |                          ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:158:19
@@ -343,6 +358,7 @@ LL |     let _: Alias5<isize> = Alias5::Some(1);
    |                   ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:163:19
@@ -351,6 +367,7 @@ LL |     let _: Alias5<usize> = ALIAS5;
    |                   ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:165:19
@@ -359,6 +376,7 @@ LL |     let _: Alias5<isize> = Alias5::Some(0);
    |                   ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:172:18
@@ -367,6 +385,7 @@ LL |     let _: Enum1<isize> = Enum1::Some(1);
    |                  ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:176:18
@@ -375,6 +394,7 @@ LL |     let _: Enum1<usize> = ENUM1;
    |                  ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:177:18
@@ -383,6 +403,7 @@ LL |     let _: Enum1<isize> = Enum1::Some(0);
    |                  ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:205:25
@@ -391,6 +412,7 @@ LL |     let _: Enum3<isize, usize> = ENUM3;
    |                         ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:207:25
@@ -399,6 +421,7 @@ LL |     let _: Enum3<isize, isize> = Enum3::Ok(0);
    |                         ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:208:25
@@ -407,6 +430,7 @@ LL |     let _: Enum3<usize, usize> = Enum3::Ok(0);
    |                         ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:230:18
@@ -415,6 +439,7 @@ LL |     let _: Enum5<isize> = Enum5::Some(1);
    |                  ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:235:18
@@ -423,6 +448,7 @@ LL |     let _: Enum5<usize> = ENUM5;
    |                  ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_default'
   --> $DIR/generics-default-stability.rs:237:18
@@ -431,6 +457,7 @@ LL |     let _: Enum5<isize> = Enum5::Some(0);
    |                  ^^^^^
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'box_alloc_param'
   --> $DIR/generics-default-stability.rs:244:24
@@ -439,6 +466,7 @@ LL |     let _: Box1<isize, System> = Box1::new(1);
    |                        ^^^^^^
    |
    = help: add `#![feature(box_alloc_param)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 warning: use of deprecated field `unstable_generic_param::Struct4::field`: test
   --> $DIR/generics-default-stability.rs:71:39
diff --git a/tests/ui/stability-attribute/issue-28075.stderr b/tests/ui/stability-attribute/issue-28075.stderr
index e16eae88b01d2..282686d82bbc1 100644
--- a/tests/ui/stability-attribute/issue-28075.stderr
+++ b/tests/ui/stability-attribute/issue-28075.stderr
@@ -5,6 +5,7 @@ LL | use lint_stability::{unstable, deprecated};
    |                      ^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/stability-attribute/issue-28388-3.stderr b/tests/ui/stability-attribute/issue-28388-3.stderr
index 0fb62ece31360..56ca57591ce0e 100644
--- a/tests/ui/stability-attribute/issue-28388-3.stderr
+++ b/tests/ui/stability-attribute/issue-28388-3.stderr
@@ -5,6 +5,7 @@ LL | use lint_stability::UnstableEnum::{};
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/stability-attribute/stability-attribute-implies-no-feature.stderr b/tests/ui/stability-attribute/stability-attribute-implies-no-feature.stderr
index c2331f6766c4f..b35ee6c12913d 100644
--- a/tests/ui/stability-attribute/stability-attribute-implies-no-feature.stderr
+++ b/tests/ui/stability-attribute/stability-attribute-implies-no-feature.stderr
@@ -6,6 +6,7 @@ LL | use stability_attribute_implies::{foo, foobar};
    |
    = note: see issue #1 <https://github.com/rust-lang/rust/issues/1> for more information
    = help: add `#![feature(foobar)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'foobar'
   --> $DIR/stability-attribute-implies-no-feature.rs:12:5
@@ -15,6 +16,7 @@ LL |     foobar();
    |
    = note: see issue #1 <https://github.com/rust-lang/rust/issues/1> for more information
    = help: add `#![feature(foobar)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/stability-attribute/stability-attribute-issue.stderr b/tests/ui/stability-attribute/stability-attribute-issue.stderr
index df4aec7e5c801..336e0f1718ffd 100644
--- a/tests/ui/stability-attribute/stability-attribute-issue.stderr
+++ b/tests/ui/stability-attribute/stability-attribute-issue.stderr
@@ -6,6 +6,7 @@ LL |     unstable();
    |
    = note: see issue #1 <https://github.com/rust-lang/rust/issues/1> for more information
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature': message
   --> $DIR/stability-attribute-issue.rs:10:5
@@ -15,6 +16,7 @@ LL |     unstable_msg();
    |
    = note: see issue #2 <https://github.com/rust-lang/rust/issues/2> for more information
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/stability-attribute/stable-in-unstable.stderr b/tests/ui/stability-attribute/stable-in-unstable.stderr
index b5e3e5f1202c1..eb73f047acd1c 100644
--- a/tests/ui/stability-attribute/stable-in-unstable.stderr
+++ b/tests/ui/stability-attribute/stable-in-unstable.stderr
@@ -6,6 +6,7 @@ LL |     use stable_in_unstable_core::new_unstable_module;
    |
    = note: see issue #1 <https://github.com/rust-lang/rust/issues/1> for more information
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/stable-in-unstable.rs:17:9
@@ -15,6 +16,7 @@ LL |     use stable_in_unstable_core::new_unstable_module::OldTrait;
    |
    = note: see issue #1 <https://github.com/rust-lang/rust/issues/1> for more information
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/stable-in-unstable.rs:29:9
@@ -24,6 +26,7 @@ LL |     use stable_in_unstable_core::new_unstable_module::OldTrait;
    |
    = note: see issue #1 <https://github.com/rust-lang/rust/issues/1> for more information
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/stable-in-unstable.rs:39:10
@@ -33,6 +36,7 @@ LL |     impl stable_in_unstable_core::new_unstable_module::OldTrait for LocalTy
    |
    = note: see issue #1 <https://github.com/rust-lang/rust/issues/1> for more information
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/stable-in-unstable.rs:49:56
@@ -42,6 +46,7 @@ LL |     use stable_in_unstable_core::new_unstable_module::{OldTrait};
    |
    = note: see issue #1 <https://github.com/rust-lang/rust/issues/1> for more information
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'unstable_test_feature'
   --> $DIR/stable-in-unstable.rs:53:9
@@ -51,6 +56,7 @@ LL |     use stable_in_unstable_core::new_unstable_module::*;
    |
    = note: see issue #1 <https://github.com/rust-lang/rust/issues/1> for more information
    = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 6 previous errors
 
diff --git a/tests/ui/stability-attribute/suggest-vec-allocator-api.stderr b/tests/ui/stability-attribute/suggest-vec-allocator-api.stderr
index 41e5787b8c2de..d7fcba4ced55d 100644
--- a/tests/ui/stability-attribute/suggest-vec-allocator-api.stderr
+++ b/tests/ui/stability-attribute/suggest-vec-allocator-api.stderr
@@ -8,6 +8,7 @@ LL |     let _: Vec<u8, _> = vec![];
    |
    = note: see issue #32838 <https://github.com/rust-lang/rust/issues/32838> for more information
    = help: add `#![feature(allocator_api)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'allocator_api'
   --> $DIR/suggest-vec-allocator-api.rs:6:9
@@ -17,6 +18,7 @@ LL |         _> = vec![];
    |
    = note: see issue #32838 <https://github.com/rust-lang/rust/issues/32838> for more information
    = help: add `#![feature(allocator_api)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 help: consider wrapping the inner types in tuple
    |
 LL ~     let _: Vec<(
@@ -32,6 +34,7 @@ LL |     let _boxed: Box<u32, _> = Box::new(10);
    |
    = note: see issue #32838 <https://github.com/rust-lang/rust/issues/32838> for more information
    = help: add `#![feature(allocator_api)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'allocator_api'
   --> $DIR/suggest-vec-allocator-api.rs:7:24
@@ -43,6 +46,7 @@ LL |     let _ = Vec::<u16, _>::new();
    |
    = note: see issue #32838 <https://github.com/rust-lang/rust/issues/32838> for more information
    = help: add `#![feature(allocator_api)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 4 previous errors
 
diff --git a/tests/ui/stmt_expr_attrs_no_feature.stderr b/tests/ui/stmt_expr_attrs_no_feature.stderr
index dc06521fe72a3..c801268c652be 100644
--- a/tests/ui/stmt_expr_attrs_no_feature.stderr
+++ b/tests/ui/stmt_expr_attrs_no_feature.stderr
@@ -6,6 +6,7 @@ LL |     #[rustfmt::skip]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
   --> $DIR/stmt_expr_attrs_no_feature.rs:95:18
@@ -15,6 +16,7 @@ LL |     fn y(a: [u8; #[rustc_dummy] 5]);
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
   --> $DIR/stmt_expr_attrs_no_feature.rs:102:19
@@ -24,6 +26,7 @@ LL |     const Y: u8 = #[rustc_dummy] 5;
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
   --> $DIR/stmt_expr_attrs_no_feature.rs:108:19
@@ -33,6 +36,7 @@ LL |     const Y: [u8; #[rustc_dummy] 5];
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
   --> $DIR/stmt_expr_attrs_no_feature.rs:114:18
@@ -42,6 +46,7 @@ LL |     field2: [u8; #[rustc_dummy] 5]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
   --> $DIR/stmt_expr_attrs_no_feature.rs:119:10
@@ -51,6 +56,7 @@ LL |     [u8; #[rustc_dummy] 5]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
   --> $DIR/stmt_expr_attrs_no_feature.rs:125:14
@@ -60,6 +66,7 @@ LL |         [u8; #[rustc_dummy] 5]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
   --> $DIR/stmt_expr_attrs_no_feature.rs:130:22
@@ -69,6 +76,7 @@ LL |         field2: [u8; #[rustc_dummy] 5]
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: attributes on expressions are experimental
   --> $DIR/stmt_expr_attrs_no_feature.rs:138:14
@@ -78,6 +86,7 @@ LL |         6 => #[rustc_dummy] (),
    |
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 9 previous errors
 
diff --git a/tests/ui/suggestions/fn-trait-notation.stderr b/tests/ui/suggestions/fn-trait-notation.stderr
index ed79b3d512cd5..b221af18bfc34 100644
--- a/tests/ui/suggestions/fn-trait-notation.stderr
+++ b/tests/ui/suggestions/fn-trait-notation.stderr
@@ -6,6 +6,7 @@ LL |     F: Fn<i32, Output = i32>,
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change
   --> $DIR/fn-trait-notation.rs:6:8
@@ -15,6 +16,7 @@ LL |     G: Fn<(i32, i32, ), Output = (i32, i32)>,
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change
   --> $DIR/fn-trait-notation.rs:7:8
@@ -24,6 +26,7 @@ LL |     H: Fn<(i32,), Output = i32>,
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0059]: type parameter to bare `Fn` trait must be a tuple
   --> $DIR/fn-trait-notation.rs:4:8
diff --git a/tests/ui/suggestions/impl-trait-missing-lifetime-gated.stderr b/tests/ui/suggestions/impl-trait-missing-lifetime-gated.stderr
index fee4c7268fae5..a7d636b63bd27 100644
--- a/tests/ui/suggestions/impl-trait-missing-lifetime-gated.stderr
+++ b/tests/ui/suggestions/impl-trait-missing-lifetime-gated.stderr
@@ -131,6 +131,7 @@ LL |     fn f(_: impl Iterator<Item = &()>) {}
    |                                   ^ expected named lifetime parameter
    |
    = help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 help: consider introducing a named lifetime parameter
    |
 LL |     fn f<'a>(_: impl Iterator<Item = &'a ()>) {}
@@ -143,6 +144,7 @@ LL |     fn g(mut x: impl Iterator<Item = &()>) -> Option<&()> { x.next() }
    |                                       ^ expected named lifetime parameter
    |
    = help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 help: consider introducing a named lifetime parameter
    |
 LL |     fn g<'a>(mut x: impl Iterator<Item = &'a ()>) -> Option<&()> { x.next() }
@@ -155,6 +157,7 @@ LL |     fn f(_: impl Iterator<Item = &'_ ()>) {}
    |                                   ^^ expected named lifetime parameter
    |
    = help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 help: consider introducing a named lifetime parameter
    |
 LL |     fn f<'a>(_: impl Iterator<Item = &'a ()>) {}
@@ -167,6 +170,7 @@ LL |     fn g(mut x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next()
    |                                       ^^ expected named lifetime parameter
    |
    = help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 help: consider introducing a named lifetime parameter
    |
 LL |     fn g<'a>(mut x: impl Iterator<Item = &'a ()>) -> Option<&'_ ()> { x.next() }
@@ -179,6 +183,7 @@ LL |     fn f(_: impl Foo) {}
    |                  ^^^ expected named lifetime parameter
    |
    = help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 help: consider introducing a named lifetime parameter
    |
 LL |     fn f<'a>(_: impl Foo<'a>) {}
@@ -191,6 +196,7 @@ LL |     fn g(mut x: impl Foo) -> Option<&()> { x.next() }
    |                      ^^^ expected named lifetime parameter
    |
    = help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 help: consider introducing a named lifetime parameter
    |
 LL |     fn g<'a>(mut x: impl Foo<'a>) -> Option<&()> { x.next() }
@@ -203,6 +209,7 @@ LL |     fn f(_: impl Foo<()>) {}
    |                      ^ expected named lifetime parameter
    |
    = help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 help: consider introducing a named lifetime parameter
    |
 LL |     fn f<'a>(_: impl Foo<'a, ()>) {}
@@ -215,6 +222,7 @@ LL |     fn g(mut x: impl Foo<()>) -> Option<&()> { x.next() }
    |                          ^ expected named lifetime parameter
    |
    = help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 help: consider introducing a named lifetime parameter
    |
 LL |     fn g<'a>(mut x: impl Foo<'a, ()>) -> Option<&()> { x.next() }
diff --git a/tests/ui/suggestions/missing-assoc-fn.stderr b/tests/ui/suggestions/missing-assoc-fn.stderr
index 84cb6e98553ee..61a5492d583d4 100644
--- a/tests/ui/suggestions/missing-assoc-fn.stderr
+++ b/tests/ui/suggestions/missing-assoc-fn.stderr
@@ -6,6 +6,7 @@ LL |     fn bat<T: TraitB<Item: Copy>>(_: T) -> Self;
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0046]: not all trait items implemented, missing: `foo`, `bar`, `baz`, `bat`
   --> $DIR/missing-assoc-fn.rs:14:1
diff --git a/tests/ui/suggestions/type-ascription-instead-of-path-in-type.stderr b/tests/ui/suggestions/type-ascription-instead-of-path-in-type.stderr
index 4e3180e84d2dc..9c22873e79c0c 100644
--- a/tests/ui/suggestions/type-ascription-instead-of-path-in-type.stderr
+++ b/tests/ui/suggestions/type-ascription-instead-of-path-in-type.stderr
@@ -17,6 +17,7 @@ LL |     let _: Vec<A:B> = A::B;
    |
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0107]: struct takes at least 1 generic argument but 0 generic arguments were supplied
   --> $DIR/type-ascription-instead-of-path-in-type.rs:6:12
diff --git a/tests/ui/target-feature/gate.stderr b/tests/ui/target-feature/gate.stderr
index b3bd12600f8dc..d281f0a6ab922 100644
--- a/tests/ui/target-feature/gate.stderr
+++ b/tests/ui/target-feature/gate.stderr
@@ -6,6 +6,7 @@ LL | #[target_feature(enable = "avx512bw")]
    |
    = note: see issue #44839 <https://github.com/rust-lang/rust/issues/44839> for more information
    = help: add `#![feature(avx512_target_feature)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/target-feature/invalid-attribute.rs b/tests/ui/target-feature/invalid-attribute.rs
index f6357bd9eb089..7c5941f5bae86 100644
--- a/tests/ui/target-feature/invalid-attribute.rs
+++ b/tests/ui/target-feature/invalid-attribute.rs
@@ -31,6 +31,7 @@ unsafe fn foo() {}
 #[target_feature(enable = "sse2")]
 //~^ ERROR `#[target_feature(..)]` can only be applied to `unsafe` functions
 //~| NOTE see issue #69098
+//~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 fn bar() {}
 //~^ NOTE not an `unsafe` function
 
@@ -102,6 +103,7 @@ impl Quux for Foo {
     #[target_feature(enable = "sse2")]
     //~^ ERROR `#[target_feature(..)]` can only be applied to `unsafe` functions
     //~| NOTE see issue #69098
+    //~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
     fn foo() {}
     //~^ NOTE not an `unsafe` function
 }
diff --git a/tests/ui/target-feature/invalid-attribute.stderr b/tests/ui/target-feature/invalid-attribute.stderr
index 8f981d27c53f5..278b9ad5003a6 100644
--- a/tests/ui/target-feature/invalid-attribute.stderr
+++ b/tests/ui/target-feature/invalid-attribute.stderr
@@ -32,7 +32,7 @@ LL | extern "Rust" {}
    | ---------------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:37:1
+  --> $DIR/invalid-attribute.rs:38:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -41,7 +41,7 @@ LL | mod another {}
    | -------------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:42:1
+  --> $DIR/invalid-attribute.rs:43:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -50,7 +50,7 @@ LL | const FOO: usize = 7;
    | --------------------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:47:1
+  --> $DIR/invalid-attribute.rs:48:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -59,7 +59,7 @@ LL | struct Foo;
    | ----------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:52:1
+  --> $DIR/invalid-attribute.rs:53:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -68,7 +68,7 @@ LL | enum Bar {}
    | ----------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:57:1
+  --> $DIR/invalid-attribute.rs:58:1
    |
 LL |   #[target_feature(enable = "sse2")]
    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -81,7 +81,7 @@ LL | | }
    | |_- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:65:1
+  --> $DIR/invalid-attribute.rs:66:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -90,7 +90,7 @@ LL | type Uwu = ();
    | -------------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:70:1
+  --> $DIR/invalid-attribute.rs:71:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -99,7 +99,7 @@ LL | trait Baz {}
    | ------------ not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:80:1
+  --> $DIR/invalid-attribute.rs:81:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -108,7 +108,7 @@ LL | static A: () = ();
    | ------------------ not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:85:1
+  --> $DIR/invalid-attribute.rs:86:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -117,7 +117,7 @@ LL | impl Quux for u8 {}
    | ------------------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:92:1
+  --> $DIR/invalid-attribute.rs:93:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -126,7 +126,7 @@ LL | impl Foo {}
    | ----------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:110:5
+  --> $DIR/invalid-attribute.rs:112:5
    |
 LL |       #[target_feature(enable = "sse2")]
    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -138,7 +138,7 @@ LL | |     }
    | |_____- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:118:5
+  --> $DIR/invalid-attribute.rs:120:5
    |
 LL |     #[target_feature(enable = "sse2")]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -175,15 +175,16 @@ LL | fn bar() {}
    |
    = note: see issue #69098 <https://github.com/rust-lang/rust/issues/69098> for more information
    = help: add `#![feature(target_feature_11)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: cannot use `#[inline(always)]` with `#[target_feature]`
-  --> $DIR/invalid-attribute.rs:75:1
+  --> $DIR/invalid-attribute.rs:76:1
    |
 LL | #[inline(always)]
    | ^^^^^^^^^^^^^^^^^
 
 error[E0658]: `#[target_feature(..)]` can only be applied to `unsafe` functions
-  --> $DIR/invalid-attribute.rs:102:5
+  --> $DIR/invalid-attribute.rs:103:5
    |
 LL |     #[target_feature(enable = "sse2")]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -193,9 +194,10 @@ LL |     fn foo() {}
    |
    = note: see issue #69098 <https://github.com/rust-lang/rust/issues/69098> for more information
    = help: add `#![feature(target_feature_11)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0046]: not all trait items implemented, missing: `foo`
-  --> $DIR/invalid-attribute.rs:87:1
+  --> $DIR/invalid-attribute.rs:88:1
    |
 LL | impl Quux for u8 {}
    | ^^^^^^^^^^^^^^^^ missing `foo` in implementation
diff --git a/tests/ui/thread-local/thread-local-static.stderr b/tests/ui/thread-local/thread-local-static.stderr
index b03f4580c2cf1..59bd17b39d85e 100644
--- a/tests/ui/thread-local/thread-local-static.stderr
+++ b/tests/ui/thread-local/thread-local-static.stderr
@@ -29,6 +29,7 @@ LL | const fn g(x: &mut [u32; 8]) {
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0625]: thread-local statics cannot be accessed at compile-time
   --> $DIR/thread-local-static.rs:10:28
@@ -52,6 +53,7 @@ LL |     std::mem::swap(x, &mut STATIC_VAR_2)
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 5 previous errors; 1 warning emitted
 
diff --git a/tests/ui/tool-attributes/diagnostic_item.stderr b/tests/ui/tool-attributes/diagnostic_item.stderr
index a181aee6b5819..c6ae5a38594fd 100644
--- a/tests/ui/tool-attributes/diagnostic_item.stderr
+++ b/tests/ui/tool-attributes/diagnostic_item.stderr
@@ -5,6 +5,7 @@ LL | #[rustc_diagnostic_item = "foomp"]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/track-diagnostics/track6.stderr b/tests/ui/track-diagnostics/track6.stderr
index 8ca56d6db2162..9ed8a19629df9 100644
--- a/tests/ui/track-diagnostics/track6.stderr
+++ b/tests/ui/track-diagnostics/track6.stderr
@@ -7,6 +7,7 @@ LL |     default fn bar() {}
    |
    = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
    = help: add `#![feature(specialization)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/traits/alias/generic-default-in-dyn.stderr b/tests/ui/traits/alias/generic-default-in-dyn.stderr
index 0d3f794aa0f7a..50031e184c106 100644
--- a/tests/ui/traits/alias/generic-default-in-dyn.stderr
+++ b/tests/ui/traits/alias/generic-default-in-dyn.stderr
@@ -6,6 +6,7 @@ LL | trait SendEqAlias<T> = PartialEq;
    |
    = note: see issue #41517 <https://github.com/rust-lang/rust/issues/41517> for more information
    = help: add `#![feature(trait_alias)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0393]: the type parameter `Rhs` must be explicitly specified
   --> $DIR/generic-default-in-dyn.rs:4:19
diff --git a/tests/ui/traits/default-method/rustc_must_implement_one_of_gated.stderr b/tests/ui/traits/default-method/rustc_must_implement_one_of_gated.stderr
index cb7eb1567c815..162c3d36cb1c6 100644
--- a/tests/ui/traits/default-method/rustc_must_implement_one_of_gated.stderr
+++ b/tests/ui/traits/default-method/rustc_must_implement_one_of_gated.stderr
@@ -5,6 +5,7 @@ LL | #[rustc_must_implement_one_of(eq, neq)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/traits/issue-78372.stderr b/tests/ui/traits/issue-78372.stderr
index ec692ff911df5..44a62988daf37 100644
--- a/tests/ui/traits/issue-78372.stderr
+++ b/tests/ui/traits/issue-78372.stderr
@@ -44,6 +44,7 @@ LL | use std::ops::DispatchFromDyn;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(dispatch_from_dyn)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'dispatch_from_dyn'
   --> $DIR/issue-78372.rs:3:9
@@ -52,6 +53,7 @@ LL | impl<T> DispatchFromDyn<Smaht<U, MISC>> for T {}
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(dispatch_from_dyn)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0378]: the trait `DispatchFromDyn` may only be implemented for a coercion between structures
   --> $DIR/issue-78372.rs:3:1
diff --git a/tests/ui/traits/negative-impls/feature-gate-negative_impls.stderr b/tests/ui/traits/negative-impls/feature-gate-negative_impls.stderr
index a232e6d8619b2..f3dee114116ca 100644
--- a/tests/ui/traits/negative-impls/feature-gate-negative_impls.stderr
+++ b/tests/ui/traits/negative-impls/feature-gate-negative_impls.stderr
@@ -6,6 +6,7 @@ LL | impl !MyTrait for u32 {}
    |
    = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
    = help: add `#![feature(negative_impls)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/traits/next-solver/dont-ice-on-assoc-projection.stderr b/tests/ui/traits/next-solver/dont-ice-on-assoc-projection.stderr
index 368f5cd0c3b1a..db7d2dd3e3a31 100644
--- a/tests/ui/traits/next-solver/dont-ice-on-assoc-projection.stderr
+++ b/tests/ui/traits/next-solver/dont-ice-on-assoc-projection.stderr
@@ -6,6 +6,7 @@ LL | impl<T> Foo for T where T: Bar<ASSOC = 0> {}
    |
    = note: see issue #92827 <https://github.com/rust-lang/rust/issues/92827> for more information
    = help: add `#![feature(associated_const_equality)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0119]: conflicting implementations of trait `Foo` for type `()`
   --> $DIR/dont-ice-on-assoc-projection.rs:15:1
diff --git a/tests/ui/transmutability/malformed-program-gracefulness/feature-missing.stderr b/tests/ui/transmutability/malformed-program-gracefulness/feature-missing.stderr
index ba8093f861465..9f22190717262 100644
--- a/tests/ui/transmutability/malformed-program-gracefulness/feature-missing.stderr
+++ b/tests/ui/transmutability/malformed-program-gracefulness/feature-missing.stderr
@@ -6,6 +6,7 @@ LL | use std::mem::BikeshedIntrinsicFrom;
    |
    = note: see issue #99571 <https://github.com/rust-lang/rust/issues/99571> for more information
    = help: add `#![feature(transmutability)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: use of unstable library feature 'transmutability'
   --> $DIR/feature-missing.rs:8:5
@@ -15,6 +16,7 @@ LL | use std::mem::Assume;
    |
    = note: see issue #99571 <https://github.com/rust-lang/rust/issues/99571> for more information
    = help: add `#![feature(transmutability)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/type-alias-impl-trait/issue-60371.stderr b/tests/ui/type-alias-impl-trait/issue-60371.stderr
index ffc664736355a..1c83b0655f5ee 100644
--- a/tests/ui/type-alias-impl-trait/issue-60371.stderr
+++ b/tests/ui/type-alias-impl-trait/issue-60371.stderr
@@ -6,6 +6,7 @@ LL |     type Item = impl Bug;
    |
    = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
    = help: add `#![feature(impl_trait_in_assoc_type)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0277]: the trait bound `(): Bug` is not satisfied
   --> $DIR/issue-60371.rs:10:40
diff --git a/tests/ui/typeck/issue-105946.stderr b/tests/ui/typeck/issue-105946.stderr
index 2220271e58122..33d4e0b141ab3 100644
--- a/tests/ui/typeck/issue-105946.stderr
+++ b/tests/ui/typeck/issue-105946.stderr
@@ -17,6 +17,7 @@ LL |     let [_y..] = [Box::new(1), Box::new(2)];
    |
    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
    = help: add `#![feature(half_open_range_patterns_in_slices)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0308]: mismatched types
   --> $DIR/issue-105946.rs:2:12
diff --git a/tests/ui/unboxed-closures/unboxed-closure-feature-gate.stderr b/tests/ui/unboxed-closures/unboxed-closure-feature-gate.stderr
index d06fa3007dfb4..77aafe227d19e 100644
--- a/tests/ui/unboxed-closures/unboxed-closure-feature-gate.stderr
+++ b/tests/ui/unboxed-closures/unboxed-closure-feature-gate.stderr
@@ -6,6 +6,7 @@ LL |     let x: Box<dyn Foo(isize)>;
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/unboxed-closures/unboxed-closure-sugar-not-used-on-fn.stderr b/tests/ui/unboxed-closures/unboxed-closure-sugar-not-used-on-fn.stderr
index 9da36906d5542..e6f34d7e3b4b7 100644
--- a/tests/ui/unboxed-closures/unboxed-closure-sugar-not-used-on-fn.stderr
+++ b/tests/ui/unboxed-closures/unboxed-closure-sugar-not-used-on-fn.stderr
@@ -6,6 +6,7 @@ LL | fn bar1(x: &dyn Fn<(), Output=()>) {
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change
   --> $DIR/unboxed-closure-sugar-not-used-on-fn.rs:7:28
@@ -15,6 +16,7 @@ LL | fn bar2<T>(x: &T) where T: Fn<()> {
    |
    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/unknown-unstable-lints/deny-unstable-lint-command-line.stderr b/tests/ui/unknown-unstable-lints/deny-unstable-lint-command-line.stderr
index df83c10308438..1eb469c7cdb18 100644
--- a/tests/ui/unknown-unstable-lints/deny-unstable-lint-command-line.stderr
+++ b/tests/ui/unknown-unstable-lints/deny-unstable-lint-command-line.stderr
@@ -2,6 +2,7 @@ error: unknown lint: `test_unstable_lint`
    |
    = note: the `test_unstable_lint` lint is unstable
    = help: add `-Zcrate-attr="feature(test_unstable_lint)"` to the command-line options to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: requested on the command line with `-D unknown-lints`
 
 error: aborting due to 1 previous error
diff --git a/tests/ui/unknown-unstable-lints/deny-unstable-lint-inline.stderr b/tests/ui/unknown-unstable-lints/deny-unstable-lint-inline.stderr
index 0afe3d55c98a5..e486f04f2735a 100644
--- a/tests/ui/unknown-unstable-lints/deny-unstable-lint-inline.stderr
+++ b/tests/ui/unknown-unstable-lints/deny-unstable-lint-inline.stderr
@@ -6,6 +6,7 @@ LL | #![allow(test_unstable_lint)]
    |
    = note: the `test_unstable_lint` lint is unstable
    = help: add `#![feature(test_unstable_lint)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 note: the lint level is defined here
   --> $DIR/deny-unstable-lint-inline.rs:3:9
    |
diff --git a/tests/ui/unknown-unstable-lints/warn-unknown-unstable-lint-command-line.stderr b/tests/ui/unknown-unstable-lints/warn-unknown-unstable-lint-command-line.stderr
index c133b880ebde3..9d838f7d1eaed 100644
--- a/tests/ui/unknown-unstable-lints/warn-unknown-unstable-lint-command-line.stderr
+++ b/tests/ui/unknown-unstable-lints/warn-unknown-unstable-lint-command-line.stderr
@@ -2,6 +2,7 @@ warning: unknown lint: `test_unstable_lint`
    |
    = note: the `test_unstable_lint` lint is unstable
    = help: add `-Zcrate-attr="feature(test_unstable_lint)"` to the command-line options to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: requested on the command line with `-W unknown-lints`
 
 warning: 1 warning emitted
diff --git a/tests/ui/unknown-unstable-lints/warn-unknown-unstable-lint-inline.stderr b/tests/ui/unknown-unstable-lints/warn-unknown-unstable-lint-inline.stderr
index 48c83b49e2962..981d3b1a874cb 100644
--- a/tests/ui/unknown-unstable-lints/warn-unknown-unstable-lint-inline.stderr
+++ b/tests/ui/unknown-unstable-lints/warn-unknown-unstable-lint-inline.stderr
@@ -6,6 +6,7 @@ LL | #![allow(test_unstable_lint)]
    |
    = note: the `test_unstable_lint` lint is unstable
    = help: add `#![feature(test_unstable_lint)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 note: the lint level is defined here
   --> $DIR/warn-unknown-unstable-lint-inline.rs:3:9
    |
diff --git a/tests/ui/unsafe/ranged_ints2_const.stderr b/tests/ui/unsafe/ranged_ints2_const.stderr
index f267dc6e23e48..2d25084314eaf 100644
--- a/tests/ui/unsafe/ranged_ints2_const.stderr
+++ b/tests/ui/unsafe/ranged_ints2_const.stderr
@@ -14,6 +14,7 @@ LL |     let y = &mut x.0;
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: mutable references are not allowed in constant functions
   --> $DIR/ranged_ints2_const.rs:18:22
@@ -23,6 +24,7 @@ LL |     let y = unsafe { &mut x.0 };
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: mutable references are not allowed in constant functions
   --> $DIR/ranged_ints2_const.rs:24:22
@@ -32,6 +34,7 @@ LL |     unsafe { let y = &mut x.0; }
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 4 previous errors
 
diff --git a/tests/ui/unsafe/ranged_ints3_const.stderr b/tests/ui/unsafe/ranged_ints3_const.stderr
index 75b36cdf94bf9..c388a66f6315c 100644
--- a/tests/ui/unsafe/ranged_ints3_const.stderr
+++ b/tests/ui/unsafe/ranged_ints3_const.stderr
@@ -14,6 +14,7 @@ LL |     let y = &x.0;
    |
    = note: see issue #80384 <https://github.com/rust-lang/rust/issues/80384> for more information
    = help: add `#![feature(const_refs_to_cell)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: cannot borrow here, since the borrowed element may contain interior mutability
   --> $DIR/ranged_ints3_const.rs:19:22
@@ -23,6 +24,7 @@ LL |     let y = unsafe { &x.0 };
    |
    = note: see issue #80384 <https://github.com/rust-lang/rust/issues/80384> for more information
    = help: add `#![feature(const_refs_to_cell)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error: aborting due to 3 previous errors