Port symbol mangler attrs

[Bryntet]

Tracking issue: #131229

@JonathanBrouwer could you run perf on this?

[JonathanBrouwer]

@bors try @rust-timer queue

[rust-bors]

☀️ Try build successful (CI)
Build commit: 3162956 (3162956ac6c60e4ef7d9ae98b1319ef2d1e08ec6, parent: 9bc8b40bc314b74e1d5e5ab21a0df39c55a34806)

[rust-timer]

Finished benchmarking commit (3162956): comparison URL.

Overall result: ❌✅ regressions and improvements - no action needed

Benchmarking this pull request means it may be perf-sensitive – we'll automatically label it not fit for rolling up. You can override this, but we strongly advise not to, due to possible changes in compiler perf.

@bors rollup=never
@rustbot label: -S-waiting-on-perf -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)	0.3%	[0.3%, 0.3%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.2%	[-0.4%, -0.0%]	3
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (secondary -1.7%)

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)	0.6%	[0.6%, 0.6%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.8%	[-3.5%, -2.0%]	2
All ❌✅ (primary)	-	-	0

Cycles

Results (secondary -3.7%)

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)	2.7%	[2.7%, 2.7%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-10.2%	[-10.2%, -10.2%]	1
All ❌✅ (primary)	-	-	0

Binary size

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

Bootstrap: 473.122s -> 472.718s (-0.09%)
Artifact size: 391.33 MiB -> 391.30 MiB (-0.01%)

[rust-bors]

☔ The latest upstream changes (presumably #150957) made this pull request unmergeable. Please resolve the merge conflicts.

[jdonszelmann]

@Bryntet any chance we can merge this one soon? Ran into wanting it converted in another PR :3

[rustbot]

Some changes occurred in compiler/rustc_attr_parsing

cc @jdonszelmann, @JonathanBrouwer

Some changes occurred in compiler/rustc_passes/src/check_attr.rs

cc @jdonszelmann, @JonathanBrouwer

Some changes occurred in compiler/rustc_hir/src/attrs

cc @jdonszelmann, @JonathanBrouwer

[rustbot]

r? @madsmtm

rustbot has assigned @madsmtm.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

[Bryntet]

r? @jdonszelmann

thanks for reminding me about this PR, had forgotten about it

[Bryntet]

@rustbot ready

CI seems to fail due to rustdoc-gui, on 4 tests which (at least on my machine) fail on latest main as well..

[JonathanBrouwer]

@bors author
aarch64-gnu-llvm-20-1 is failing on tests/ui/symbol-names/impl2.rs
https://productionresultssa1.blob.core.windows.net/actions-results/6228c8b8-c413-4e5f-b339-fac92a2a5ef4/workflow-job-run-ca275570-e52e-521d-a507-0ebda727f4b7/logs/job/job-logs.txt?rsct=text%2Fplain&se=2026-02-06T08%3A58%3A54Z&sig=Qy2KsaDTJpi3l3TxKofWiqoVKZkINo%2FmajR8zmpRsAQ%3D&ske=2026-02-06T11%3A57%3A58Z&skoid=ca7593d4-ee42-46cd-af88-8b886a2f84eb&sks=b&skt=2026-02-06T07%3A57%3A58Z&sktid=398a6654-997b-47e9-b12b-9515b896b4de&skv=2025-11-05&sp=r&spr=https&sr=b&st=2026-02-06T08%3A48%3A49Z&sv=2025-11-05

[JonathanBrouwer]

@rustbot author

[rustbot]

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

[Bryntet]

@rustbot ready

[JonathanBrouwer]

@bors r=jdonszelmann,JonathanBrouwer rollup

[rust-bors]

📌 Commit 10f0c2d has been approved by jdonszelmann,JonathanBrouwer

It is now in the queue for this repository.