Rollup of 13 pull requests #151087

GuillaumeGomez · 2026-01-13T22:39:14Z

Successful merges:

triagebot: add A-rustdoc-js autolabel #150587 (triagebot: add A-rustdoc-js autolabel)
Improve std::path::Path::join documentation #150677 (Improve std::path::Path::join documentation)
diagnostics: make implicit Sized bounds explicit in E0277 #150737 (diagnostics: make implicit Sized bounds explicit in E0277)
Remove legacy homu try and auto branch mentions #150771 (Remove legacy homu try and auto branch mentions)
Make --print=check-cfg output compatible --check-cfg arguments #150840 (Make --print=check-cfg output compatible --check-cfg arguments)
Regression test for type params on eii #150915 (Regression test for type params on eii)
Port the rustc dump attributes to the attribute parser #151017 (Port the rustc dump attributes to the attribute parser)
Make Type::of support unsized types #151019 (Make Type::of support unsized types)
Support arrays in type reflection #151031 (Support arrays in type reflection)
armv7-unknown-linux-uclibceabihf.md: Fix bootstrap.toml syntax #151043 (armv7-unknown-linux-uclibceabihf.md: Fix bootstrap.toml syntax)
ui: add regression test for macro resolution ICE (issue #150711) #151052 (ui: add regression test for macro resolution ICE (issue ICE in resolve #150711))
Reduce flakyness for tests/rustdoc-gui/notable-trait.goml #151053 (Reduce flakyness for tests/rustdoc-gui/notable-trait.goml)
Emit error instead of delayed bug when meeting mismatch type for const array #151055 (Emit error instead of delayed bug when meeting mismatch type for const array)

When a trait parameter depends upon Sized, the error message only referred to the full trait itself and didn't mention Sized. This makes the failure to implement Sized explicit. It also notes when the Sized trait bound is explicit or implicit.

I chose to simply extend `dump.rs`, rather than create a new UI test.

Adapt `PathBuf::push` documentation for `Path::join` and add it to `join`'s docs Fix to comply with tidy Remove unnecessary whitespace

With the suggested value we were getting instead: ``` ERROR: Failed to parse '/tmp/rust/bootstrap.toml': unknown field `stage`, expected one of `build`, `description`, `host`, `target`, `build-dir`, `cargo`, `rustc`, `rustfmt`, `cargo-clippy`, `docs`, `compiler-docs`, `library-docs-private-items`, `docs-minification`, `submodules`, `gdb`, `lldb`, `nodejs`, `npm`, `yarn`, `python`, `windows-rc`, `reuse`, `locked-deps`, `vendor`, `full-bootstrap`, `bootstrap-cache-path`, `extended`, `tools`, `tool`, `verbose`, `sanitizers`, `profiler`, `cargo-native-static`, `low-priority`, `configure-args`, `local-rebuild`, `print-step-timings`, `print-step-rusage`, `check-stage`, `doc-stage`, `build-stage`, `test-stage`, `install-stage`, `dist-stage`, `bench-stage`, `patch-binaries-for-nix`, `metrics`, `android-ndk`, `optimized-compiler-builtins`, `jobs`, `compiletest-diff-tool`, `compiletest-allow-stage0`, `compiletest-use-stage0-libtest`, `tidy-extra-checks`, `ccache`, `exclude` for key `build` ```

The old toolchain is not working with recent rustc, as it does not defining `getauxval`

… and test this

array

triagebot: add A-rustdoc-js autolabel Adds an autolabel rule for rustdoc JavaScript/TypeScript files so PRs touching rustdoc frontend assets and related tests are automatically labeled `A-rustdoc-js`. Fixes rust-lang#137983

Improve std::path::Path::join documentation Adapt `PathBuf::push` documentation for `Path::join` and add it to `join`'s docs rust-lang#146447

diagnostics: make implicit Sized bounds explicit in E0277 When a trait parameter depends upon Sized, the error message only referred to the full trait itself and didn't mention Sized. This makes the failure to implement Sized explicit. It also notes when the Sized trait bound is explicit or implicit. Fixes rust-lang#150576

Remove legacy homu `try` and `auto` branch mentions ~~To be merged once we get rid of homu.~~ I think that we can merge this now.

…nethercote Make `--print=check-cfg` output compatible `--check-cfg` arguments This PR changes significantly the output of the unstable `--print=check-cfg` option. Specifically it removes the ad-hoc resemblance with `--print=cfg` in order to output a simplified but still compatible `--check-cfg` arguments. The goal is to future proof the output of `--print=check-cfg` like `--check-cfg` is, and the best way to do that is to use it's syntax. This is particularly relevant for [RFC3905](rust-lang/rfcs#3905) which wants to introduce a new predicate: `version(...)`.

GuillaumeGomez · 2026-01-13T22:39:26Z

@bors r+ p=5 rollup=never

rust-bors · 2026-01-13T22:39:30Z

📌 Commit 3adbd3a has been approved by GuillaumeGomez

It is now in the queue for this repository.

GuillaumeGomez · 2026-01-13T23:29:57Z

@bors r+ p=5 rollup=never

rust-bors · 2026-01-13T23:30:00Z

📌 Commit 3adbd3a has been approved by GuillaumeGomez

It is now in the queue for this repository.

rust-bors · 2026-01-14T06:41:55Z

☀️ Test successful - CI
Approved by: GuillaumeGomez
Pushing 4931e09 to main...

github-actions · 2026-01-14T06:45:10Z

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 fcac501 (parent) -> 4931e09 (this PR)

Test differences

Show 114 test diffs

Stage 1

[ui] tests/ui/const-generics/mgca/array-expr-type-mismatch-in-where-bound.rs: [missing] -> pass (J0)
[ui] tests/ui/eii/type_checking/generic_implementation.rs: [missing] -> pass (J0)
[ui] tests/ui/eii/type_checking/type_params_149983.rs: [missing] -> pass (J0)
[ui] tests/ui/error-codes/E0277-4.rs: [missing] -> pass (J0)
[ui] tests/ui/reflection/tuples.rs: pass -> [missing] (J0)
[ui] tests/ui/resolve/decl-macro-use-no-ice.rs: [missing] -> pass (J0)
mem::type_info::test_arrays: [missing] -> pass (J1)
mem::type_info::test_tuples: [missing] -> pass (J1)

Stage 2

[ui] tests/ui/const-generics/mgca/array-expr-type-mismatch-in-where-bound.rs: [missing] -> pass (J2)
[ui] tests/ui/eii/type_checking/generic_implementation.rs: [missing] -> pass (J2)
[ui] tests/ui/eii/type_checking/type_params_149983.rs: [missing] -> pass (J2)
[ui] tests/ui/error-codes/E0277-4.rs: [missing] -> pass (J2)
[ui] tests/ui/reflection/tuples.rs: pass -> [missing] (J2)
[ui] tests/ui/resolve/decl-macro-use-no-ice.rs: [missing] -> pass (J2)
mem::type_info::test_arrays: [missing] -> pass (J3)
mem::type_info::test_tuples: [missing] -> pass (J3)

Additionally, 98 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 4931e09e3ac3182d2a00f38cccfdf68e8e385e1c --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

pr-check-1: 1637.2s -> 2058.5s (+25.7%)
dist-x86_64-apple: 7358.3s -> 8938.9s (+21.5%)
aarch64-gnu-llvm-20-2: 2994.6s -> 3351.3s (+11.9%)
i686-gnu-2: 5340.8s -> 5918.3s (+10.8%)
dist-arm-linux-musl: 5483.2s -> 6067.9s (+10.7%)
dist-aarch64-llvm-mingw: 5999.8s -> 5401.1s (-10.0%)
x86_64-gnu-llvm-20-2: 5347.8s -> 5864.8s (+9.7%)
dist-ohos-armv7: 3801.6s -> 4164.9s (+9.6%)
x86_64-gnu-tools: 3408.1s -> 3733.4s (+9.5%)
dist-aarch64-linux: 6010.1s -> 6572.6s (+9.4%)

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 · 2026-01-14T06:45:34Z

📌 Perf builds for each rolled up PR:

PR#	Message	Perf Build Sha
#150587	triagebot: add A-rustdoc-js autolabel	`41c8566e9829584a351c218e87d9735b17bfcfdb` (link)
#150677	Improve std::path::Path::join documentation	`8e9884c481d5d33be065d4bb4849fdf86d1e0610` (link)
#150737	diagnostics: make implicit Sized bounds explicit in E0277	`6d062e5f29bbc917e6c59d374a95d9655c717149` (link)
#150771	Remove legacy homu `try` and `auto` branch mentions	`e67436849ccc45800b8b4a25ec2b256aba13bf90` (link)
#150840	Make `--print=check-cfg` output compatible `--check-cfg` ar…	`cc3903c92c863419caf68d2d95b7c266aa41303d` (link)
#150915	Regression test for type params on eii	`7b02f30597ca23f481441d06e219916636d3874e` (link)
#151017	Port the rustc dump attributes to the attribute parser	`c0ca60c72568afff8b8bf0d864942fe3407e1eb7` (link)
#151019	Make `Type::of` support unsized types	`5ad4b78b74d632599783d25676c864aadfd3ba4c` (link)
#151031	Support arrays in type reflection	`b63fb2d847d35ca4761108e834db5abb012b32f4` (link)
#151043	armv7-unknown-linux-uclibceabihf.md: Fix bootstrap.toml syn…	`f83d05b42deee395602d9c048e2f62c323f83170` (link)
#151052	ui: add regression test for macro resolution ICE (issue #15…	`1c737eadf38ab6b3fb28485c561eb23dfa243078` (link)
#151053	Reduce flakyness for `tests/rustdoc-gui/notable-trait.goml`	`eaa11f11fb2fdf614f7f32e22582baf8aafd6af3` (link)
#151055	Emit error instead of delayed bug when meeting mismatch typ…	`82f58a2b812343d2bee53a36568a94debc74b267` (link)

previous master: fcac501a73

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

rust-timer · 2026-01-14T07:23:55Z

Finished benchmarking commit (4931e09): comparison URL.

Overall result: ❌ regressions - please read the text below

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
Regressions ❌ (secondary)	0.3%	[0.1%, 0.4%]	9
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (primary 1.8%, secondary 1.3%)

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

	mean	range	count
Regressions ❌ (primary)	1.8%	[0.9%, 2.7%]	2
Regressions ❌ (secondary)	3.3%	[1.4%, 7.0%]	5
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.1%	[-2.3%, -2.0%]	3
All ❌✅ (primary)	1.8%	[0.9%, 2.7%]	2

Cycles

Results (primary 2.4%, secondary -3.1%)

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

	mean	range	count
Regressions ❌ (primary)	2.4%	[2.4%, 2.4%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-3.1%	[-5.4%, -2.1%]	11
All ❌✅ (primary)	2.4%	[2.4%, 2.4%]	1

Binary size

Results (primary 0.0%, 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)	0.0%	[0.0%, 0.0%]	1
Regressions ❌ (secondary)	0.0%	[0.0%, 0.0%]	7
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.0%	[0.0%, 0.0%]	1

Bootstrap: 474.33s -> 474.176s (-0.03%)
Artifact size: 383.14 MiB -> 383.16 MiB (0.01%)

AaryanAgrawal96 and others added 30 commits January 2, 2026 14:09

triagebot: add autolabel for rustdoc JS files

7668154

Remove legacy homu try and auto branch mentions

9c4ead6

fix: make Type::of supported unsized types

b57c249

chore: test Type::of on unsized types

1bde2f4

I chose to simply extend `dump.rs`, rather than create a new UI test.

Make --print=check-cfg output compatible --check-cfg arguments

feb44c3

Update compiletest for new --print=check-cfg output

dd2b0a8

Improve std::path::Path::join documentation

d697b4d

Adapt `PathBuf::push` documentation for `Path::join` and add it to `join`'s docs Fix to comply with tidy Remove unnecessary whitespace

armv7-unknown-linux-uclibceabihf.md: Update toolchain download link

1e69091

The old toolchain is not working with recent rustc, as it does not defining `getauxval`

Fix citool tests

c263d36

ui: add regression test for macro resolution ICE

ef9cbad

Reduce flakyness for tests/rustdoc-gui/notable-trait.goml

62849e6

type params on eii

1d96806

deduplicate error message when EII has generics

d25f471

bless the tests

b64a9be

ensure generics are still properly reported on EII *implementations*,…

b454f76

… and test this

Emit error instead of delayed bug when meeting mismatch type for const

d616e6c

array

Port #[rustc_dump_user_args]

84d59d0

Port #[rustc_dump_def_parents]

cf4d480

Port #[rustc_dump_item_bounds]

2a45540

Port #[rustc_dump_vtable]

a4c34b4

Port #[rustc_dump_predicates]

abcbf72

feat: support arrays in type reflection

e027ecd

refactor: move tuples type info ui test to coretest

71f8ea9

Rollup merge of rust-lang#150677 - improve-doc, r=Mark-Simulacrum

7fc878c

Improve std::path::Path::join documentation Adapt `PathBuf::push` documentation for `Path::join` and add it to `join`'s docs rust-lang#146447

Rollup merge of rust-lang#150771 - remove-homu-branches, r=marcoieni

66f25e9

Remove legacy homu `try` and `auto` branch mentions ~~To be merged once we get rid of homu.~~ I think that we can merge this now.

rust-bors bot added the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label Jan 13, 2026

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GuillaumeGomez mentioned this pull request Jan 13, 2026

Rollup of 13 pull requests #151070

Closed

lqd mentioned this pull request Jan 13, 2026

Rollup of 13 pull requests #151086

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GuillaumeGomez closed this Jan 13, 2026

GuillaumeGomez deleted the rollup-vIdiReJ branch January 13, 2026 23:28

GuillaumeGomez restored the rollup-vIdiReJ branch January 13, 2026 23:29

GuillaumeGomez reopened this Jan 13, 2026

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rust-bors bot added the merged-by-bors This PR was explicitly merged by bors. label Jan 14, 2026

rust-bors bot removed the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label Jan 14, 2026

rust-bors bot merged commit 4931e09 into rust-lang:main Jan 14, 2026
14 of 23 checks passed

rustbot added this to the 1.94.0 milestone Jan 14, 2026

rust-bors bot mentioned this pull request Jan 14, 2026

Change bors build finished job to publish toolstate #150772

Open

rust-bors bot mentioned this pull request Jan 14, 2026

Deduplicated float tests and unified in floats/mod.rs #148206

Open

rustbot added the perf-regression Performance regression. label Jan 14, 2026

GuillaumeGomez deleted the rollup-vIdiReJ branch January 14, 2026 09:07

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Test differences

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Stage 2

Job duration changes

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Overall result: ❌ regressions - please read the text below

Instruction count

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Cycles

Binary size

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