Sync fork

Add a fast-path to `Debug` ASCII `&str`

Instead of going through the `EscapeDebug` machinery, we can just skip over ASCII chars that don’t need any escaping.

Introduce printable-ASCII fast-path for `impl Debug for str`

Instead of having a single loop that works on utf-8 `char`s,
this splits the implementation into a loop that quickly skips over
printable ASCII, falling back to per-char iteration for other chunks.

Switch to primarily using `&str`

Surprisingly, benchmarks have shown that using `&str`
instead of `&[u8]` with some `unsafe` code is actually faster.

Process a single not-ASCII-printable `char` per iteration

This avoids having to collect a non-ASCII-printable run before processing it.

std: simplify key-based thread locals

std: clean up the TLS implementation

Make clamp inline

Run rustfmt on files that need it.

Somehow these files aren't properly formatted. By default `x fmt` and `x
tidy` only check files that have changed against master, so if an
ill-formatted file somehow slips in it can stay that way as long as it
doesn't get modified(?)

I found these when I ran `x fmt` explicitly on every `.rs` file in the
repo, while working on
rust-lang/compiler-team#750.

Fix the dead link in the bootstrap README

Notify kobzol after changes to `opt-dist`

Revert "Rollup merge of rust-lang#123979 - oli-obk:define_opaque_types7, r=compiler-errors"

This reverts commit f939d1f, reversing
changes made to 183c706.

Add regression tests

Only suppress binop error in favor of semicolon suggestion if we're in an assignment statement

compiler: const_eval/transform/validate.rs -> mir_transform/validate.rs

compiler: unnest rustc_const_eval::check_consts

clippy: unnest check_consts

miri: receive the blessings of validate.rs

Migrate `run-make/rustdoc-with-output-dir-option` to `rmake.rs`

Fix some SIMD intrinsics documentation

Actually just remove the special case altogether

rustdoc-json: Add test for keywords with `--document-private-items`

tag more stuff with `WG-trait-system-refactor`

Warn/error on self ctor from outer item in inner item

(Mostly) revert "Account for type param from other item in `note_and_explain`"

This mostly reverts commit 7449478.
It also removes an `opt_param_at` that really is unnecessary given our
ICE policy for malformed intrinsics.

Update cargo

use posix_memalign on most Unix targets

fix typo

Co-authored-by: Jubilee <[email protected]>

Fail relating constants of different types

Use regular type equating instead of a custom query

Bump bootstrap compiler to the latest beta compiler

Remove now outdated comment since we bumped stage0

Stop using the avx512er and avx512pf x86 target features

They are no longer supported by LLVM 19.

Fixes rust-lang#125492

remove proof tree formatter, make em shallow

Don't eagerly monomorphize drop for types that are impossible to instantiate

Better ICE message for unresolved upvars

Structurally resolve before builtin_index in EUV

Add manual Sync impl for ReentrantLockGuard

Fixes: rust-lang#125526

Cargo.lock

@@ -4252,6 +4252,7 @@ dependencies = [
  "rustc_fluent_macro",
  "rustc_hir",
  "rustc_index",
+ "rustc_infer",
  "rustc_macros",
  "rustc_middle",
  "rustc_mir_build",

compiler/rustc_codegen_ssa/src/base.rs

@@ -29,8 +29,8 @@ use rustc_middle::middle::debugger_visualizer::{DebuggerVisualizerFile, Debugger
 use rustc_middle::middle::exported_symbols;
 use rustc_middle::middle::exported_symbols::SymbolExportKind;
 use rustc_middle::middle::lang_items;
-use rustc_middle::mir::BinOp;
 use rustc_middle::mir::mono::{CodegenUnit, CodegenUnitNameBuilder, MonoItem};
+use rustc_middle::mir::BinOp;
 use rustc_middle::query::Providers;
 use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf, TyAndLayout};
 use rustc_middle::ty::{self, Instance, Ty, TyCtxt};

compiler/rustc_const_eval/src/const_eval/error.rs

@@ -139,10 +139,9 @@ where
             ErrorHandled::TooGeneric(span)
         }
         err_inval!(AlreadyReported(guar)) => ErrorHandled::Reported(guar, span),
-        err_inval!(Layout(LayoutError::ReferencesError(guar))) => ErrorHandled::Reported(
-            ReportedErrorInfo::tainted_by_errors(guar),
-            span,
-        ),
+        err_inval!(Layout(LayoutError::ReferencesError(guar))) => {
+            ErrorHandled::Reported(ReportedErrorInfo::tainted_by_errors(guar), span)
+        }
         // Report remaining errors.
         _ => {
             let (our_span, frames) = get_span_and_frames();

compiler/rustc_const_eval/src/lib.rs

@@ -14,10 +14,10 @@
 #![feature(yeet_expr)]
 #![feature(if_let_guard)]
 
+pub mod check_consts;
 pub mod const_eval;
 mod errors;
 pub mod interpret;
-pub mod transform;
 pub mod util;
 
 use std::sync::atomic::AtomicBool;

compiler/rustc_hir_analysis/src/check/intrinsic.rs

@@ -164,9 +164,8 @@ pub fn check_intrinsic_type(
 ) {
     let generics = tcx.generics_of(intrinsic_id);
     let param = |n| {
-        if let Some(&ty::GenericParamDef {
-            name, kind: ty::GenericParamDefKind::Type { .. }, ..
-        }) = generics.opt_param_at(n as usize, tcx)
+        if let &ty::GenericParamDef { name, kind: ty::GenericParamDefKind::Type { .. }, .. } =
+            generics.param_at(n as usize, tcx)
         {
             Ty::new_param(tcx, n, name)
         } else {

compiler/rustc_hir_analysis/src/collect/predicates_of.rs

@@ -461,83 +461,55 @@ pub(super) fn explicit_predicates_of<'tcx>(
             }
         }
     } else {
-        if matches!(def_kind, DefKind::AnonConst) && tcx.features().generic_const_exprs {
-            let hir_id = tcx.local_def_id_to_hir_id(def_id);
-            let parent_def_id = tcx.hir().get_parent_item(hir_id);
-
-            if let Some(defaulted_param_def_id) =
-                tcx.hir().opt_const_param_default_param_def_id(hir_id)
-            {
-                // In `generics_of` we set the generics' parent to be our parent's parent which means that
-                // we lose out on the predicates of our actual parent if we dont return those predicates here.
-                // (See comment in `generics_of` for more information on why the parent shenanigans is necessary)
-                //
-                // struct Foo<T, const N: usize = { <T as Trait>::ASSOC }>(T) where T: Trait;
-                //        ^^^                     ^^^^^^^^^^^^^^^^^^^^^^^ the def id we are calling
-                //        ^^^                                             explicit_predicates_of on
-                //        parent item we dont have set as the
-                //        parent of generics returned by `generics_of`
-                //
-                // In the above code we want the anon const to have predicates in its param env for `T: Trait`
-                // and we would be calling `explicit_predicates_of(Foo)` here
-                let parent_preds = tcx.explicit_predicates_of(parent_def_id);
-
-                // If we dont filter out `ConstArgHasType` predicates then every single defaulted const parameter
-                // will ICE because of #106994. FIXME(generic_const_exprs): remove this when a more general solution
-                // to #106994 is implemented.
-                let filtered_predicates = parent_preds
-                    .predicates
-                    .into_iter()
-                    .filter(|(pred, _)| {
-                        if let ty::ClauseKind::ConstArgHasType(ct, _) = pred.kind().skip_binder() {
-                            match ct.kind() {
-                                ty::ConstKind::Param(param_const) => {
-                                    let defaulted_param_idx = tcx
-                                        .generics_of(parent_def_id)
-                                        .param_def_id_to_index[&defaulted_param_def_id.to_def_id()];
-                                    param_const.index < defaulted_param_idx
-                                }
-                                _ => bug!(
-                                    "`ConstArgHasType` in `predicates_of`\
-                                 that isn't a `Param` const"
-                                ),
+        if matches!(def_kind, DefKind::AnonConst)
+            && tcx.features().generic_const_exprs
+            && let Some(defaulted_param_def_id) =
+                tcx.hir().opt_const_param_default_param_def_id(tcx.local_def_id_to_hir_id(def_id))
+        {
+            // In `generics_of` we set the generics' parent to be our parent's parent which means that
+            // we lose out on the predicates of our actual parent if we dont return those predicates here.
+            // (See comment in `generics_of` for more information on why the parent shenanigans is necessary)
+            //
+            // struct Foo<T, const N: usize = { <T as Trait>::ASSOC }>(T) where T: Trait;
+            //        ^^^                     ^^^^^^^^^^^^^^^^^^^^^^^ the def id we are calling
+            //        ^^^                                             explicit_predicates_of on
+            //        parent item we dont have set as the
+            //        parent of generics returned by `generics_of`
+            //
+            // In the above code we want the anon const to have predicates in its param env for `T: Trait`
+            // and we would be calling `explicit_predicates_of(Foo)` here
+            let parent_def_id = tcx.local_parent(def_id);
+            let parent_preds = tcx.explicit_predicates_of(parent_def_id);
+
+            // If we dont filter out `ConstArgHasType` predicates then every single defaulted const parameter
+            // will ICE because of #106994. FIXME(generic_const_exprs): remove this when a more general solution
+            // to #106994 is implemented.
+            let filtered_predicates = parent_preds
+                .predicates
+                .into_iter()
+                .filter(|(pred, _)| {
+                    if let ty::ClauseKind::ConstArgHasType(ct, _) = pred.kind().skip_binder() {
+                        match ct.kind() {
+                            ty::ConstKind::Param(param_const) => {
+                                let defaulted_param_idx = tcx
+                                    .generics_of(parent_def_id)
+                                    .param_def_id_to_index[&defaulted_param_def_id.to_def_id()];
+                                param_const.index < defaulted_param_idx
                             }
-                        } else {
-                            true
+                            _ => bug!(
+                                "`ConstArgHasType` in `predicates_of`\
+                                 that isn't a `Param` const"
+                            ),
                         }
-                    })
-                    .cloned();
-                return GenericPredicates {
-                    parent: parent_preds.parent,
-                    predicates: { tcx.arena.alloc_from_iter(filtered_predicates) },
-                };
-            }
-
-            let parent_def_kind = tcx.def_kind(parent_def_id);
-            if matches!(parent_def_kind, DefKind::OpaqueTy) {
-                // In `instantiate_identity` we inherit the predicates of our parent.
-                // However, opaque types do not have a parent (see `gather_explicit_predicates_of`), which means
-                // that we lose out on the predicates of our actual parent if we dont return those predicates here.
-                //
-                //
-                // fn foo<T: Trait>() -> impl Iterator<Output = Another<{ <T as Trait>::ASSOC }> > { todo!() }
-                //                                                        ^^^^^^^^^^^^^^^^^^^ the def id we are calling
-                //                                                                            explicit_predicates_of on
-                //
-                // In the above code we want the anon const to have predicates in its param env for `T: Trait`.
-                // However, the anon const cannot inherit predicates from its parent since it's opaque.
-                //
-                // To fix this, we call `explicit_predicates_of` directly on `foo`, the parent's parent.
-
-                // In the above example this is `foo::{opaque#0}` or `impl Iterator`
-                let parent_hir_id = tcx.local_def_id_to_hir_id(parent_def_id.def_id);
-
-                // In the above example this is the function `foo`
-                let item_def_id = tcx.hir().get_parent_item(parent_hir_id);
-
-                // In the above code example we would be calling `explicit_predicates_of(foo)` here
-                return tcx.explicit_predicates_of(item_def_id);
-            }
+                    } else {
+                        true
+                    }
+                })
+                .cloned();
+            return GenericPredicates {
+                parent: parent_preds.parent,
+                predicates: { tcx.arena.alloc_from_iter(filtered_predicates) },
+            };
         }
         gather_explicit_predicates_of(tcx, def_id)
     }

compiler/rustc_hir_typeck/messages.ftl

@@ -137,6 +137,10 @@ hir_typeck_rpit_change_return_type = you could change the return type to be a bo
 hir_typeck_rustcall_incorrect_args =
     functions with the "rust-call" ABI must take a single non-self tuple argument
 
+hir_typeck_self_ctor_from_outer_item = can't reference `Self` constructor from outer item
+    .label = the inner item doesn't inherit generics from this impl, so `Self` is invalid to reference
+    .suggestion = replace `Self` with the actual type
+
 hir_typeck_struct_expr_non_exhaustive =
     cannot create non-exhaustive {$what} using struct expression
 

compiler/rustc_hir_typeck/src/errors.rs

@@ -651,3 +651,31 @@ pub enum SuggestBoxingForReturnImplTrait {
         ends: Vec<Span>,
     },
 }
+
+#[derive(Diagnostic)]
+#[diag(hir_typeck_self_ctor_from_outer_item, code = E0401)]
+pub struct SelfCtorFromOuterItem {
+    #[primary_span]
+    pub span: Span,
+    #[label]
+    pub impl_span: Span,
+    #[subdiagnostic]
+    pub sugg: Option<ReplaceWithName>,
+}
+
+#[derive(LintDiagnostic)]
+#[diag(hir_typeck_self_ctor_from_outer_item)]
+pub struct SelfCtorFromOuterItemLint {
+    #[label]
+    pub impl_span: Span,
+    #[subdiagnostic]
+    pub sugg: Option<ReplaceWithName>,
+}
+
+#[derive(Subdiagnostic)]
+#[suggestion(hir_typeck_suggestion, code = "{name}", applicability = "machine-applicable")]
+pub struct ReplaceWithName {
+    #[primary_span]
+    pub span: Span,
+    pub name: String,
+}

compiler/rustc_hir_typeck/src/expr_use_visitor.rs

@@ -1741,7 +1741,11 @@ impl<'tcx, Cx: TypeInformationCtxt<'tcx>, D: Delegate<'tcx>> ExprUseVisitor<'tcx
             }
 
             PatKind::Slice(before, ref slice, after) => {
-                let Some(element_ty) = place_with_id.place.ty().builtin_index() else {
+                let Some(element_ty) = self
+                    .cx
+                    .try_structurally_resolve_type(pat.span, place_with_id.place.ty())
+                    .builtin_index()
+                else {
                     debug!("explicit index of non-indexable type {:?}", place_with_id);
                     return Err(self
                         .cx

compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs

@@ -1,5 +1,5 @@
 use crate::callee::{self, DeferredCallResolution};
-use crate::errors::CtorIsPrivate;
+use crate::errors::{self, CtorIsPrivate};
 use crate::method::{self, MethodCallee, SelfSource};
 use crate::rvalue_scopes;
 use crate::{BreakableCtxt, Diverges, Expectation, FnCtxt, LoweredTy};
@@ -21,6 +21,7 @@ use rustc_hir_analysis::hir_ty_lowering::{
 use rustc_infer::infer::canonical::{Canonical, OriginalQueryValues, QueryResponse};
 use rustc_infer::infer::error_reporting::TypeAnnotationNeeded::E0282;
 use rustc_infer::infer::{DefineOpaqueTypes, InferResult};
+use rustc_lint::builtin::SELF_CONSTRUCTOR_FROM_OUTER_ITEM;
 use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow, AutoBorrowMutability};
 use rustc_middle::ty::error::TypeError;
 use rustc_middle::ty::fold::TypeFoldable;
@@ -1156,6 +1157,43 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 span,
                 tcx.at(span).type_of(impl_def_id).instantiate_identity(),
             );
+
+            // Firstly, check that this SelfCtor even comes from the item we're currently
+            // typechecking. This can happen because we never validated the resolution of
+            // SelfCtors, and when we started doing so, we noticed regressions. After
+            // sufficiently long time, we can remove this check and turn it into a hard
+            // error in `validate_res_from_ribs` -- it's just difficult to tell whether the
+            // self type has any generic types during rustc_resolve, which is what we use
+            // to determine if this is a hard error or warning.
+            if std::iter::successors(Some(self.body_id.to_def_id()), |def_id| {
+                self.tcx.generics_of(def_id).parent
+            })
+            .all(|def_id| def_id != impl_def_id)
+            {
+                let sugg = ty.normalized.ty_adt_def().map(|def| errors::ReplaceWithName {
+                    span: path_span,
+                    name: self.tcx.item_name(def.did()).to_ident_string(),
+                });
+                if ty.raw.has_param() {
+                    let guar = self.tcx.dcx().emit_err(errors::SelfCtorFromOuterItem {
+                        span: path_span,
+                        impl_span: tcx.def_span(impl_def_id),
+                        sugg,
+                    });
+                    return (Ty::new_error(self.tcx, guar), res);
+                } else {
+                    self.tcx.emit_node_span_lint(
+                        SELF_CONSTRUCTOR_FROM_OUTER_ITEM,
+                        hir_id,
+                        path_span,
+                        errors::SelfCtorFromOuterItemLint {
+                            impl_span: tcx.def_span(impl_def_id),
+                            sugg,
+                        },
+                    );
+                }
+            }
+
             match ty.normalized.ty_adt_def() {
                 Some(adt_def) if adt_def.has_ctor() => {
                     let (ctor_kind, ctor_def_id) = adt_def.non_enum_variant().ctor.unwrap();

compiler/rustc_hir_typeck/src/op.rs

@@ -381,10 +381,13 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 let maybe_missing_semi = self.check_for_missing_semi(expr, &mut err);
 
                 // We defer to the later error produced by `check_lhs_assignable`.
-                // We only downgrade this if it's the LHS, though.
+                // We only downgrade this if it's the LHS, though, and if this is a
+                // valid assignment statement.
                 if maybe_missing_semi
                     && let hir::Node::Expr(parent) = self.tcx.parent_hir_node(expr.hir_id)
                     && let hir::ExprKind::Assign(lhs, _, _) = parent.kind
+                    && let hir::Node::Stmt(stmt) = self.tcx.parent_hir_node(parent.hir_id)
+                    && let hir::StmtKind::Expr(_) | hir::StmtKind::Semi(_) = stmt.kind
                     && lhs.hir_id == expr.hir_id
                 {
                     err.downgrade_to_delayed_bug();

compiler/rustc_incremental/src/persist/load.rs

@@ -116,8 +116,7 @@ fn load_dep_graph(sess: &Session) -> LoadResult<(Arc<SerializedDepGraph>, WorkPr
 
         if let LoadResult::Ok { data: (work_products_data, start_pos) } = load_result {
             // Decode the list of work_products
-            let Ok(mut work_product_decoder) =
-                MemDecoder::new(&work_products_data[..], start_pos)
+            let Ok(mut work_product_decoder) = MemDecoder::new(&work_products_data[..], start_pos)
             else {
                 sess.dcx().emit_warn(errors::CorruptFile { path: &work_products_path });
                 return LoadResult::DataOutOfDate;