Rollup of 9 pull requests by JonathanBrouwer · Pull Request #153232 · rust-lang/rust

JonathanBrouwer · 2026-02-28T18:56:01Z

Successful merges:

Inhibit all-absent-variant optimization for all enum reprs that inhibit layout optimization, not just repr(C). #146989 (Inhibit all-absent-variant optimization for all enum reprs that inhibit layout optimization, not just repr(C).)
std: sys: pal: uefi: os: Implement split_paths #151991 (std: sys: pal: uefi: os: Implement split_paths)
Fix ICE in try_to_raw_bytes when array elements have mismatched #152794 (Fix ICE in try_to_raw_bytes when array elements have mismatched)
std random.rs: update link to RTEMS docs #153052 (std random.rs: update link to RTEMS docs)
docs: note env var influence on temp_dir and env_clear on Windows #153054 (docs: note env var influence on temp_dir and env_clear on Windows)
cleanup tests/ui/box, part 2 #153061 (cleanup tests/ui/box, part 2)
style: Update doctests for TryFrom<integer> for bool and From<bool> for float #153197 (style: Update doctests for TryFrom<integer> for bool and From<bool> for float)
Fix ICE on empty file with -Zquery-dep-graph #153210 (Fix ICE on empty file with -Zquery-dep-graph)
Remove TranslationError #153228 (Remove TranslationError)

…it layout optimization, not just repr(C).

The old URL with `master` resulted in a 404 error - use `main` instead.

sizes

- Based on Windows implementation. Just removed support for quote escaping since that is not supported in UEFI. - Tested using OVMF on QEMU Signed-off-by: Ayush Singh <ayush@beagleboard.org>

- Add test for split_paths for UEFI target. - `;` is the path separator. Escaping is not supported. Signed-off-by: Ayush Singh <ayush@beagleboard.org>

These doctests are attached to the `TryFrom` trait. Therefore, it is easier to understand to use the `try_from` method instead of the `try_into` method.

These doctests are attached to the `From` trait. Therefore, it is easier to understand to use the `from` method instead of the `into` method.

* docs: explicitly list env vars checked by temp_dir on Windows On Windows, temp_dir() internally calls GetTempPath2/GetTempPath which checks TMP, TEMP, USERPROFILE environment variables in order. This information was previously only available by following links to Microsoft docs. Making it explicit in Rust's own documentation improves discoverability. Addresses rust-lang#125439. * docs: note env var influence on temp_dir and env_clear on Windows On Windows, �nv::temp_dir() internally calls GetTempPath2/GetTempPath, which checks TMP, TEMP, and USERPROFILE in order. Document this lookup order directly in the emp_dir docs rather than requiring users to follow the link to Microsoft documentation. Also add a note on Command::env_clear explaining that clearing the environment affects the child process's emp_dir(), not the parent's. Closes rust-lang#125439. * docs: drop Windows env_clear temp_dir note

Inhibit all-absent-variant optimization for all enum reprs that inhibit layout optimization, not just repr(C). *[View all comments](https://triagebot.infra.rust-lang.org/gh-comments/rust-lang/rust/pull/146989)* Fixes rust-lang#146984

@rustbot

std: sys: pal: uefi: os: Implement split_paths - Tested using OVMF on QEMU @rustbot label +O-UEFI cc @nicholasbishop

Fix ICE in `try_to_raw_bytes` when array elements have mismatched close: rust-lang#152683 After rust-lang#152001, suffixed integer literals preserve their own type during const lowering, so `try_to_raw_bytes` could call `.to_u8()` on a scalar with size > 1, causing an ICE. Fix by using `try_to_bits(Size::from_bytes(1)).ok()` instead. r? BoxyUwU

std random.rs: update link to RTEMS docs The old URL with `master` resulted in a 404 error - use `main` instead.

…s, r=Mark-Simulacrum docs: note env var influence on `temp_dir` and `env_clear` on Windows On Windows, `env::temp_dir()` internally calls `GetTempPath2`/`GetTempPath`, which checks the `TMP`, `TEMP`, and `USERPROFILE` environment variables in order before falling back to the Windows directory. This lookup order was previously only discoverable by following links to Microsoft documentation. This PR documents the env var lookup order directly in `env::temp_dir` docs and notes `GetTempPath2`'s SYSTEM-identity behavior (`C:\Windows\SystemTemp`). Addresses rust-lang#125439.

@Kivooeo

cleanup `tests/ui/box`, part 2 Followup to rust-lang#152868. I merged some of the slightly less trivial tests into `basic-operations.rs` and deleted several others entirely. r? @Kivooeo (since you claimed the last one, but feel free to reassign) Part of rust-lang#133895.

… r=joboet style: Update doctests for `TryFrom<integer> for bool` and `From<bool> for float` These doctests are attached to the `TryFrom` trait and the `From` trait. Although `From<U> for T` implies `Into<T> for U` and `TryFrom<U> for T` implies `TryInto<T> for U`, I think it is easier to understand to use the `try_from`/`from` method directly instead of the `try_into`/`into` method.

…jdonszelmann,JonathanBrouwer Fix ICE on empty file with -Zquery-dep-graph added a guard in `DepGraph::register_dep_node_debug_str` so it early-returns when `self.data` is still `None`. this happens for the first few dep-nodes in an empty crate with `-Z query-dep-graph`, which caused the previous `unwrap()` panic. fixes rust-lang#153199

@Kivooeo

…rror, r=lqd Remove `TranslationError` This function is now infallible, since the diagnostic message and presence of variables is already parsed in the `msg!` or `derive(Diagnostic)` macro. In practice, the result of this function was just unwrapped everywhere anyways... r? @Kivooeo if you feel like reviewing diagnostics PRs again, I have a few more coming :) (Tho other people are also free to steal these PRs)

JonathanBrouwer · 2026-02-28T18:56:07Z

@bors r+ rollup=never p=5

rust-bors · 2026-02-28T18:56:09Z

📌 Commit 453fe91 has been approved by JonathanBrouwer

It is now in the queue for this repository.

JonathanBrouwer · 2026-02-28T18:56:11Z

Trying commonly failed jobs
@bors try jobs=test-various,x86_64-gnu-aux,x86_64-gnu-llvm-21-3,x86_64-msvc-1,aarch64-apple,x86_64-mingw-1

Rollup of 9 pull requests try-job: test-various try-job: x86_64-gnu-aux try-job: x86_64-gnu-llvm-21-3 try-job: x86_64-msvc-1 try-job: aarch64-apple try-job: x86_64-mingw-1

rust-bors · 2026-02-28T22:25:39Z

☀️ Try build successful (CI)
Build commit: c70f4a2 (c70f4a20072637ecdb8ff904a3d811bd06078caf, parent: ba1567989ee7774a1fb53aa680a8e4e8daa0f519)

rust-bors · 2026-03-01T01:50:05Z

☀️ Test successful - CI
Approved by: JonathanBrouwer
Duration: 3h 51m 34s
Pushing 8215374 to main...

rust-timer · 2026-03-01T01:52:38Z

📌 Perf builds for each rolled up PR:

PR#	Message	Perf Build Sha
#146989	Inhibit all-absent-variant optimization for all enum reprs …	`7255d7d865bc6c50cb9064acaf4f0a27242b3694` (link)
#151991	std: sys: pal: uefi: os: Implement split_paths	`00bb4b24b662e82b2e7ef6e8fd5eaaa2e66564f9` (link)
#152794	Fix ICE in `try_to_raw_bytes` when array elements have mism…	`8fe67675887df469c0d3bcf37dca26465f275923` (link)
#153052	std random.rs: update link to RTEMS docs	`268e491884fccae35d518f401ba32c24ec5a9185` (link)
#153054	docs: note env var influence on `temp_dir` and `env_clear` …	`06e7e693a62e26ad7f47415d18e7afa359c1a402` (link)
#153061	cleanup `tests/ui/box`, part 2	`93cc015c9945b69c6c57ef0f3e2a777d0b02dea8` (link)
#153197	style: Update doctests for `TryFrom<integer> for bool` and …	`c37d8dada96bb3b73d7d75b85d7dbcecefcbde50` (link)
#153210	Fix ICE on empty file with -Zquery-dep-graph	`23164dbd728741d514d6bb6b1edf26969ead4ff5` (link)
#153228	Remove `TranslationError`	`b0fd0f91a3982303779ab68124c7e0b1c7c6303b` (link)

previous master: 38c0de8dcb

In the case of a perf regression, run the following command for each PR you suspect might be the cause: @rust-timer build $SHA

github-actions · 2026-03-01T01:53:05Z

What is this?

This is an experimental post-merge analysis report that shows differences in test outcomes between the merged PR and its parent PR.

Comparing 38c0de8 (parent) -> 8215374 (this PR)

Test differences

Show 65 test diffs

Stage 1

[ui] tests/ui/box/new-box-syntax.rs: pass -> [missing] (J1)
[ui] tests/ui/box/new.rs: pass -> [missing] (J1)
[ui] tests/ui/box/unit/basic-operations.rs: [missing] -> pass (J1)
[ui] tests/ui/box/unit/expr-if-unique.rs: pass -> [missing] (J1)
[ui] tests/ui/box/unit/unique-assign-copy.rs: pass -> [missing] (J1)
[ui] tests/ui/box/unit/unique-assign-drop.rs: pass -> [missing] (J1)
[ui] tests/ui/box/unit/unique-assign-generic.rs: pass -> [missing] (J1)
[ui] tests/ui/box/unit/unique-autoderef-field.rs: pass -> [missing] (J1)
[ui] tests/ui/box/unit/unique-autoderef-index.rs: pass -> [missing] (J1)
[ui] tests/ui/box/unit/unique-cmp.rs: pass -> [missing] (J1)
[ui] tests/ui/box/unit/unique-decl-init-copy.rs: pass -> [missing] (J1)
[ui] tests/ui/box/unit/unique-fn-arg-mut.rs: pass -> [missing] (J1)
[ui] tests/ui/box/unit/unique-in-vec.rs: pass -> [missing] (J1)
[ui] tests/ui/box/unit/unique-move-drop.rs: pass -> [missing] (J1)
[ui] tests/ui/box/unit/unique-mutable.rs: pass -> [missing] (J1)
[ui] tests/ui/box/unit/unwind-unique.rs: pass -> [missing] (J1)
[ui] tests/ui/const-generics/mgca/array_elem_type_mismatch.rs: [missing] -> pass (J1)
[ui] tests/ui/const-generics/mgca/wrapped_array_elem_type_mismatch.rs: [missing] -> pass (J1)
[ui] tests/ui/dep-graph/query-dep-graph-empty.rs: [missing] -> pass (J1)

Stage 2

[ui] tests/ui/box/new-box-syntax.rs: pass -> [missing] (J0)
[ui] tests/ui/box/new.rs: pass -> [missing] (J0)
[ui] tests/ui/box/unit/basic-operations.rs: [missing] -> pass (J0)
[ui] tests/ui/box/unit/expr-if-unique.rs: pass -> [missing] (J0)
[ui] tests/ui/box/unit/unique-assign-copy.rs: pass -> [missing] (J0)
[ui] tests/ui/box/unit/unique-assign-drop.rs: pass -> [missing] (J0)
[ui] tests/ui/box/unit/unique-assign-generic.rs: pass -> [missing] (J0)
[ui] tests/ui/box/unit/unique-autoderef-field.rs: pass -> [missing] (J0)
[ui] tests/ui/box/unit/unique-autoderef-index.rs: pass -> [missing] (J0)
[ui] tests/ui/box/unit/unique-cmp.rs: pass -> [missing] (J0)
[ui] tests/ui/box/unit/unique-decl-init-copy.rs: pass -> [missing] (J0)
[ui] tests/ui/box/unit/unique-fn-arg-mut.rs: pass -> [missing] (J0)
[ui] tests/ui/box/unit/unique-in-vec.rs: pass -> [missing] (J0)
[ui] tests/ui/box/unit/unique-move-drop.rs: pass -> [missing] (J0)
[ui] tests/ui/box/unit/unique-mutable.rs: pass -> [missing] (J0)
[ui] tests/ui/const-generics/mgca/array_elem_type_mismatch.rs: [missing] -> pass (J0)
[ui] tests/ui/const-generics/mgca/wrapped_array_elem_type_mismatch.rs: [missing] -> pass (J0)
[ui] tests/ui/dep-graph/query-dep-graph-empty.rs: [missing] -> pass (J0)
[ui] tests/ui/box/unit/unwind-unique.rs: pass -> [missing] (J2)
[ui] tests/ui/box/unit/unwind-unique.rs: ignore (gcc backend is marked as ignore) -> [missing] (J3)

Additionally, 26 doctest diffs were found. These are ignored, as they are noisy.

Job group index

Test dashboard

Run

cargo run --manifest-path src/ci/citool/Cargo.toml -- \
    test-dashboard 821537498d4f05f948fe4406aad99742f0e07618 --output-dir test-dashboard

And then open test-dashboard/index.html in your browser to see an overview of all executed tests.

Job duration changes

dist-aarch64-apple: 1h 44m -> 2h 20m (+34.3%)
dist-x86_64-apple: 1h 54m -> 2h 27m (+29.1%)
x86_64-gnu-aux: 2h 24m -> 2h 8m (-10.9%)
aarch64-apple: 3h 23m -> 3h 43m (+9.8%)
dist-aarch64-msvc: 1h 39m -> 1h 49m (+9.7%)
dist-i586-gnu-i586-i686-musl: 1h 31m -> 1h 22m (-9.5%)
x86_64-gnu-llvm-21-3: 1h 59m -> 1h 48m (-9.1%)
armhf-gnu: 1h 22m -> 1h 30m (+8.9%)
arm-android: 1h 37m -> 1h 46m (+8.8%)
dist-ohos-x86_64: 1h 16m -> 1h 10m (-8.2%)

How to interpret the job duration changes?

Job durations can vary a lot, based on the actual runner instance
that executed the job, system noise, invalidated caches, etc. The table above is provided
mostly for t-infra members, for simpler debugging of potential CI slow-downs.

rust-timer · 2026-03-01T02:30:47Z

Finished benchmarking commit (8215374): comparison URL.

Overall result: ❌ regressions - no action needed

@rustbot label: -perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	0.5%	[0.5%, 0.5%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

This benchmark run did not return any relevant results for this metric.

Cycles

This benchmark run did not return any relevant results for this metric.

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 481.431s -> 479.99s (-0.30%)
Artifact size: 397.60 MiB -> 397.51 MiB (-0.02%)

zachs18 and others added 22 commits September 28, 2025 15:22

Inhibit all-absent-variant optimization for all enum reprs that inhib…

85872cf

…it layout optimization, not just repr(C).

std random.rs: update link to RTEMS docs

78ea999

The old URL with `master` resulted in a 404 error - use `main` instead.

delete several useless Box tests

24ca3fc

coalesce some trivial Box tests into basic-operations.rs

25ded11

Fix ICE in try_to_raw_bytes when array elements have mismatched scalar

a5789d0

sizes

std: sys: pal: uefi: os: Implement split_paths

9fe6175

- Based on Windows implementation. Just removed support for quote escaping since that is not supported in UEFI. - Tested using OVMF on QEMU Signed-off-by: Ayush Singh <ayush@beagleboard.org>

std: tests: env: Add split_paths_uefi

c37e448

- Add test for split_paths for UEFI target. - `;` is the path separator. Escaping is not supported. Signed-off-by: Ayush Singh <ayush@beagleboard.org>

style: Update doctests for TryFrom<integer> for bool

3d03c8c

These doctests are attached to the `TryFrom` trait. Therefore, it is easier to understand to use the `try_from` method instead of the `try_into` method.

style: Update doctests for From<bool> for float

af35716

These doctests are attached to the `From` trait. Therefore, it is easier to understand to use the `from` method instead of the `into` method.

Fix ICE on empty file with -Zquery-dep-graph

038b718

Remove TranslationError

5a18412

Adjust uses of format_diag_message to remove unwrap

6e8d9c1

Rollup merge of rust-lang#151991 - Ayush1325:uefi-split-path, r=joboet

435be5b

std: sys: pal: uefi: os: Implement split_paths - Tested using OVMF on QEMU @rustbot label +O-UEFI cc @nicholasbishop

Rollup merge of rust-lang#153052 - DanielEScherzer:patch-2, r=joboet

5cf9a7f

std random.rs: update link to RTEMS docs The old URL with `master` resulted in a 404 error - use `main` instead.

rust-bors bot added the rollup A PR which is a rollup label Feb 28, 2026

rust-bors bot added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Feb 28, 2026

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rust-bors bot added merged-by-bors This PR was explicitly merged by bors. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Mar 1, 2026

rust-bors bot merged commit 8215374 into rust-lang:main Mar 1, 2026
13 checks passed

rustbot added this to the 1.96.0 milestone Mar 1, 2026

rust-bors bot mentioned this pull request Mar 1, 2026

[WIP]: Do not store tag in uninhabited enum variants, or in the single inhabited variant. #145337

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Rollup of 9 pull requests#153232

Rollup of 9 pull requests#153232
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rust-timer commented Mar 1, 2026

Overall result: ❌ regressions - no action needed

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