Rollup of 7 pull requests by JonathanBrouwer · Pull Request #161801 · rust-lang/rust

JonathanBrouwer · 2026-08-26T06:01:01Z

Successful merges:

lint against repeated repr attributes #157036 (lint against repeated repr attributes)
panic_unwind: Use global_asm! for IMGREL relocations #160183 (panic_unwind: Use global_asm! for IMGREL relocations)
Fix the wasm32-unknown-unknown target feature/cfg bug #161718 (Fix the wasm32-unknown-unknown target feature/cfg bug)
Fix broken link to lang_items.rs in unstable book #161673 (Fix broken link to lang_items.rs in unstable book)
Remove RawDefPathHash #161744 (Remove RawDefPathHash)
explicitly state that allocations cannot grow to the left #161747 (explicitly state that allocations cannot grow to the left)
Remove dead parse error recovery (underscores in expressions) #161796 (Remove dead parse error recovery (underscores in expressions))

The file path was changed in af4c79b. Fix the link, and use a specific commit so it doesn't break accidentally future.

Due to some bad ordering of session/config initialization code -- more about that in subsequent commits -- `cfg(target_has_threads)` fails to be set for the `wasm32-unknown-unknown` platform when `-Ctarget-feature=+atomics` is specified. This commit modifies a test to demonstrate the bug; as written the test passes.

- `parse_check_cfg` has a single call site and is followed by a call to `fill_well_known`. - `parse_cfg` has two call sites and in both cases is followed by a call to `build_configuration`. This commit moves the follow-up calls into the functions, simplifying `run_compiler`.

Currently it modifies the `Session` and the `Cfg` (and the `Cfg` afterwards is put into the `Session`). It also takes a `CodegenBackend`. Those are some heavyweight arguments. This commit moves the `Session` modifications to the caller so the `&mut Session` isn't necessary, and passes in the `TargetConfig` instead of the whole `CodegenBackend`, plus some other small arguments. `add_configuration` ends up more clearly about modifying the `Cfg`. This is a step towards untangling session/backend initialization.

Currently, `parse_cfg` calls `build_configuration`, which calls `default_configuration`, which calls `sess.target.singlethread(&sess.internal_target_features)`. But `sess.internal_target_features` hasn't been set at this point and is empty! This commit moves the setting of `sess.internal_target_features` before the `parse_cfg` call to fix this ordering bug. This results in the `cfg(target_has_threads)` being correctly set on `wasm32-unknown-unknown` when `-Ctarget-feature=+atomics` is specified. Note: I have plans to make this kind of ordering bug difficult/impossible in a follow-up (e.g. rust-lang#161432).

`RawSpan`, `RawDefId`, and `RawDefPathHash` were all introduced to work around the fact that `StableHashCtxt` in `rustc_data_structure` is upstream of `rustc_span`. However, `DefPathHash` is just a newtype around `Fingerprint`, which is defined in `rustc_data_structure`. So by working directly with `Fingerprint` we can remove `RawDefPathHash`, which is a nice simplification.

had to update several tests which used repeated aligns and packeds. they now produce both a warning and an error where appropriate (e.g. when using conflicting packeds) which i think is correct.

… r=jdonszelmann lint against repeated repr attributes fixes rust-lang#156029 by adding a lint against repeated repr attributes. r? scottmcm

…crum panic_unwind: Use global_asm! for IMGREL relocations Rust consteval cannot construct 32-bit values that contain the offset between two symbols, but this is required for panic_unwind on some architectures because unwinding on Windows SEH uses image-base-relative pointers for the panic information (which makes them fit in 32-bit rather than 64-bit). Currently, this is worked around by initializing these globals on panic with atomic stores. This works, but is undefined behavior as the panic runtime reads the values with non-atomic loads, which leads to a data race. Instead, utilize `global_asm!` to create the globals with `@IMGREL` relocations so that the linker constructs the relative pointers for us at link or load time. For context: [#t-compiler > relative pointers in windows SEH panic_unwind @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/131828-t-compiler/topic/relative.20pointers.20in.20windows.20SEH.20panic_unwind/near/613200087) AI assistance was involved with writing the assembly code.

@Mark-Simulacrum

Fix the wasm32-unknown-unknown target feature/cfg bug Due to some bad ordering of session/config initialization code, `cfg(target_has_threads)` fails to be set for the `wasm32-unknown-unknown` platform when `-Ctarget-feature=+atomics` is specified. This PR fixes the problem. Details in individual commits. r? @Mark-Simulacrum

Fix broken link to lang_items.rs in unstable book The file path was changed in af4c79b. Fix the link, and use a specific commit so it doesn't break accidentally in future.

@fee1-dead

…ee1-dead Remove `RawDefPathHash` `RawSpan`, `RawDefId`, and `RawDefPathHash` were all introduced to work around the fact that `StableHashCtxt` in `rustc_data_structure` is upstream of `rustc_span`. However, `DefPathHash` is just a newtype around `Fingerprint`, which is defined in `rustc_data_structure`. So by working directly with `Fingerprint` we can remove `RawDefPathHash`, which is a nice simplification. r? @fee1-dead

explicitly state that allocations cannot grow to the left This was already implied, but it seems better to make this explicit. Cc @rust-lang/opsem

…, r=mu001999 Remove dead parse error recovery (underscores in expressions) Back in rust-lang@b7f7756 (2019) the parser was extended to recover from `_`s as elements of tuple expressions (this was later extended to also cover call expressions). At the time, `_` obviously wasn't an expression yet. Nowadays `parse_expr_res` will *always* successfully parse `_` as an `ExprKind::Underscore` (irrespective of the passed `Restrictions`). Consequently, we will never reach the special case in `parse_expr_catch_underscore`. Drop this entire wrapper function. <sub>(No LLM was or will be used by me during the entire creation process of this PR)</sub>

JonathanBrouwer · 2026-08-26T06:01:15Z

@bors r+ p=5

rust-bors · 2026-08-26T06:01:18Z

📌 Commit 0ae3fd9 has been approved by JonathanBrouwer

It is now in the queue for this repository.

rust-bors · 2026-08-26T09:42:05Z

☀️ Test successful - CI
Approved by: JonathanBrouwer
Duration: 3h 28m 46s
Pushing 3ffb26f to main...

github-actions · 2026-08-26T09:45:49Z

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 6510953 (parent) -> 3ffb26f (this PR)

Test differences

Show 655 test diffs

Stage 1

[ui] tests/ui/repr/repr-repeated-attrs.rs: [missing] -> pass (J0)
[ui (polonius)] tests/ui/repr/repr-repeated-attrs.rs: [missing] -> pass (J1)

Stage 2

[ui] tests/ui/repr/repr-repeated-attrs.rs: [missing] -> pass (J2)

Additionally, 652 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 3ffb26fbf5bf232cf59e314e75ea325973f4f583 --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

x86_64-gnu-stdlib-semver-check: 8m 29s -> 17m 36s (+107.5%)
x86_64-gnu-parallel-frontend: 1h 20m -> 2h (+49.8%)
dist-x86_64-llvm-mingw: 1h 30m -> 2h 13m (+47.6%)
x86_64-gnu-llvm-22-1: 55m 25s -> 1h 21m (+47.2%)
dist-aarch64-linux: 2h 23m -> 3h 27m (+44.8%)
x86_64-gnu-nopt: 1h 46m -> 2h 26m (+36.9%)
armhf-gnu: 1h 29m -> 56m 39s (-36.9%)
i686-gnu-1: 1h 37m -> 2h 12m (+35.4%)
aarch64-apple-1: 1h 49m -> 2h 25m (+32.4%)
x86_64-gnu-debug: 1h 33m -> 2h 2m (+31.5%)

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 · 2026-08-26T10:25:09Z

Finished benchmarking commit (3ffb26f): comparison URL.

Overall result: ❌ regressions - please read:

Our benchmarks found a performance regression caused by this PR.
This might be an actual regression, but it can also be just noise.

Next Steps:

If the regression was expected or you think it can be justified,
please write a comment with sufficient written justification, and add
@rustbot label: +perf-regression-triaged to it, to mark the regression as triaged.
If you think that you know of a way to resolve the regression, try to create
a new PR with a fix for the regression.
If you do not understand the regression or you think that it is just noise,
you can ask the @rust-lang/wg-compiler-performance working group for help (members of this group
were already notified of this PR).

@rustbot label: +perf-regression
cc @rust-lang/wg-compiler-performance

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)	0.3%	[0.2%, 0.3%]	3
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.3%	[0.2%, 0.3%]	3

Max RSS (memory usage)

Results (secondary -2.6%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	3.2%	[3.0%, 3.2%]	3
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-5.0%	[-8.1%, -3.5%]	7
All ❌✅ (primary)	-	-	0

Cycles

Results (secondary 2.6%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	2.6%	[2.6%, 2.6%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

Results (primary -0.1%, secondary -0.1%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-0.1%	[-0.2%, -0.0%]	45
Improvements ✅ (secondary)	-0.1%	[-0.1%, -0.0%]	11
All ❌✅ (primary)	-0.1%	[-0.2%, -0.0%]	45

Bootstrap: 475.812s -> 476.994s (0.25%)
Artifact size: 403.37 MiB -> 402.58 MiB (-0.20%)

rust-bors · 2026-08-26T10:48:25Z

📌 Perf builds for each rolled up PR:

PR#	Message	Perf Build Sha
#157036	lint against repeated repr attributes	`39d59b8cc8a47e3bfd0035e5fde66bbbfc7dea77` (link)
#160183	panic_unwind: Use global_asm! for IMGREL relocations	`ae960b018e69c3df89a9421ddaf15e40a2606de0` (link)
#161718	Fix the wasm32-unknown-unknown target feature/cfg bug	`8a6ec0cfc91be94a91fbfc8c16fd7c5f41823bd5` (link)
#161673	Fix broken link to lang_items.rs in unstable book	`76a3160a5b0482a362020c966b600f1f0c16af77` (link)
#161744	Remove `RawDefPathHash`	`4f30517f6b80854d4618ec832504ab0910c60cb5` (link)
#161747	explicitly state that allocations cannot grow to the left	`1e8ebee66aae091b0e3e75aae98a7e9f772b3ae2` (link)
#161796	Remove dead parse error recovery (underscores in expression…	`ff197892f637f978be7c25e21c8dbc4e22dca370` (link)

parent commit: 6510953ce0

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

panstromek · 2026-08-26T12:30:37Z

These are the only ones that seem potentially relevant. libc contains a lot of reprs and DefPathHash is hot in incr builds.

@rust-timer triage 39d59b8 4f30517

rust-timer · 2026-08-26T12:30:43Z

#157036 `39d59b8` lint against repeated repr attributes

Instruction count

This perf run didn't have relevant results for this metric.

Max RSS (memory usage)

Results (secondary 2.2%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	2.2%	[2.2%, 2.2%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Cycles

Results (primary 0.6%, secondary 2.8%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	3.4%	[3.4%, 3.4%]	1
Regressions ❌ (secondary)	2.8%	[2.8%, 2.8%]	1
Improvements ✅ (primary)	-2.1%	[-2.1%, -2.1%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.6%	[-2.1%, 3.4%]	2

Binary size

This perf run didn't have relevant results for this metric.

#161744 `4f30517` Remove `RawDefPathHash`

Instruction count

This perf run didn't have relevant results for this metric.

Max RSS (memory usage)

Results (secondary -0.2%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	2.1%	[1.0%, 5.7%]	5
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-4.1%	[-5.2%, -2.3%]	3
All ❌✅ (primary)	-	-	0

Cycles

Results (primary 0.6%, secondary 0.9%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	3.4%	[3.4%, 3.4%]	1
Regressions ❌ (secondary)	4.0%	[4.0%, 4.0%]	1
Improvements ✅ (primary)	-2.1%	[-2.1%, -2.1%]	1
Improvements ✅ (secondary)	-2.2%	[-2.2%, -2.2%]	1
All ❌✅ (primary)	0.6%	[-2.1%, 3.4%]	2

Binary size

This perf run didn't have relevant results for this metric.

panstromek · 2026-08-26T16:32:07Z

@rust-timer triage ae960b0

rust-timer · 2026-08-26T16:32:11Z

#160183 `ae960b0` panic_unwind: Use global_asm! for IMGREL relocations

Instruction count

This perf run didn't have relevant results for this metric.

Max RSS (memory usage)

Results (primary 4.1%, secondary 1.1%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	4.1%	[4.1%, 4.1%]	1
Regressions ❌ (secondary)	1.9%	[1.0%, 3.7%]	5
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.9%	[-2.9%, -2.9%]	1
All ❌✅ (primary)	4.1%	[4.1%, 4.1%]	1

Cycles

Results (primary -0.5%, secondary 2.0%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	2.8%	[2.8%, 2.8%]	1
Regressions ❌ (secondary)	4.2%	[3.1%, 5.3%]	2
Improvements ✅ (primary)	-2.1%	[-2.2%, -2.1%]	2
Improvements ✅ (secondary)	-2.5%	[-2.5%, -2.5%]	1
All ❌✅ (primary)	-0.5%	[-2.2%, 2.8%]	3

Binary size

Results (secondary -0.0%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.0%	[-0.0%, -0.0%]	1
All ❌✅ (primary)	-	-	0

panstromek · 2026-08-26T17:56:45Z

Weird, let's benchmark the rest, I guess

@rust-timer triage 8a6ec0c ff19789

rust-timer · 2026-08-26T17:56:49Z

#161718 `8a6ec0c` Fix the wasm32-unknown-unknown target feature/cfg bug

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)	0.2%	[0.2%, 0.2%]	3
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.2%	[0.2%, 0.2%]	3

Max RSS (memory usage)

Results (primary 0.5%, secondary -1.9%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	0.5%	[0.5%, 0.5%]	1
Regressions ❌ (secondary)	3.0%	[1.8%, 3.6%]	4
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-4.7%	[-7.8%, -3.3%]	7
All ❌✅ (primary)	0.5%	[0.5%, 0.5%]	1

Cycles

Results (secondary -0.9%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	2.0%	[2.0%, 2.0%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.4%	[-2.7%, -2.1%]	2
All ❌✅ (primary)	-	-	0

Binary size

Results (secondary -0.0%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.0%	[-0.0%, -0.0%]	1
All ❌✅ (primary)	-	-	0

#161796 `ff19789` Remove dead parse error recovery (underscores in expressions)

Instruction count

This perf run didn't have relevant results for this metric.

Max RSS (memory usage)

Results (secondary -1.4%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	3.7%	[2.0%, 5.5%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-4.7%	[-5.6%, -3.2%]	3
All ❌✅ (primary)	-	-	0

Cycles

Results (primary -2.0%, secondary 1.8%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	3.5%	[2.3%, 5.6%]	3
Improvements ✅ (primary)	-2.0%	[-2.0%, -2.0%]	1
Improvements ✅ (secondary)	-3.1%	[-3.1%, -3.1%]	1
All ❌✅ (primary)	-2.0%	[-2.0%, -2.0%]	1

Binary size

This perf run didn't have relevant results for this metric.

panstromek · 2026-08-26T19:27:15Z

nice, definitely wouldn't guess this one. I'll continue the discussion on the PR.

@rustbot label: +perf-regression-triaged

ettolrach and others added 23 commits August 24, 2026 13:06

lint against repeated repr attributes

b32b841

Fix broken link to lang_items.rs in unstable book

a2f1460

The file path was changed in af4c79b. Fix the link, and use a specific commit so it doesn't break accidentally future.

explicitly state that allocations cannot grow to the left

57bb4d1

panic_unwind: Use global_asm! for IMGREL relocations

4339216

bring back warns for repeated reprs, update tests

1b2470e

had to update several tests which used repeated aligns and packeds. they now produce both a warning and an error where appropriate (e.g. when using conflicting packeds) which i think is correct.

finish rewording lint messages

6423eed

add another test

deb8160

also warn on repeated int reprs

4f5002d

use sort/chunk_by to find repeated reprs

819099b

add to unused group

e99f23f

Remove dead parse error recovery (underscores in expressions)

8de399a

Rollup merge of rust-lang#157036 - ettolrach:disallow-repeated-reprs,…

0230abe

… r=jdonszelmann lint against repeated repr attributes fixes rust-lang#156029 by adding a lint against repeated repr attributes. r? scottmcm

Rollup merge of rust-lang#161673 - Wilfred:patch-4, r=ShoyuVanilla

aec7c2a

Fix broken link to lang_items.rs in unstable book The file path was changed in af4c79b. Fix the link, and use a specific commit so it doesn't break accidentally in future.

Rollup merge of rust-lang#161747 - RalfJung:alloc-growth, r=saethlin

3657478

explicitly state that allocations cannot grow to the left This was already implied, but it seems better to make this explicit. Cc @rust-lang/opsem

rust-bors Bot added the rollup A PR which is a rollup label Aug 26, 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 Aug 26, 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 Aug 26, 2026

rust-bors Bot merged commit 3ffb26f into rust-lang:main Aug 26, 2026
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rustbot added this to the 1.100.0 milestone Aug 26, 2026

This was referenced Aug 26, 2026

Implement forced keywords (k#) #161775

Draft

core::num::f16b Rust's 16bit Brain Float #160859

Open

Suggest turbofish for multi-param generics used as call arguments #160104

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rustbot added the perf-regression Performance regression. label Aug 26, 2026

rustbot added the perf-regression-triaged The performance regression has been triaged. label Aug 26, 2026

panstromek mentioned this pull request Aug 26, 2026

Fix the wasm32-unknown-unknown target feature/cfg bug #161718

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Test differences

Stage 1

Stage 2

Job duration changes

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rust-timer commented Aug 26, 2026

Overall result: ❌ regressions - please read:

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#157036 39d59b8 lint against repeated repr attributes

#161744 4f30517 Remove RawDefPathHash

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#160183 ae960b0 panic_unwind: Use global_asm! for IMGREL relocations

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#161718 8a6ec0c Fix the wasm32-unknown-unknown target feature/cfg bug

#161796 ff19789 Remove dead parse error recovery (underscores in expressions)

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#157036 `39d59b8` lint against repeated repr attributes

#161744 `4f30517` Remove `RawDefPathHash`

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#160183 `ae960b0` panic_unwind: Use global_asm! for IMGREL relocations

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#161718 `8a6ec0c` Fix the wasm32-unknown-unknown target feature/cfg bug

#161796 `ff19789` Remove dead parse error recovery (underscores in expressions)