Rollup of 4 pull requests by JonathanBrouwer · Pull Request #163493 · rust-lang/rust

JonathanBrouwer · 2026-09-29T15:48:00Z

Successful merges:

Add Dir equivalents of fs::metadata & fs::symlink_metadata #163024 (Add Dir equivalents of fs::metadata & fs::symlink_metadata)
Bump min Emscripten version to 4.0, drop deprecated -sWASM_BIGINT for wasm32-unknown-emscripten #162839 (Bump min Emscripten version to 4.0, drop deprecated -sWASM_BIGINT for wasm32-unknown-emscripten)
Fix incorrect typo suggestion for struct field shorthands #163370 (Fix incorrect typo suggestion for struct field shorthands)
do not suggest capturing '_ twice in use<...> for E0700 #163471 (do not suggest capturing '_ twice in use<...> for E0700)

the test records what the compiler prints today: for an opaque that already has use<'_> and a second anonymous lifetime to capture, it suggested use<'_, '_>, which doesnt compile

suggest_precise_capturing was appending '_ to a use<..> list that already had it, suggesting use<'_, '_>, which rustc rejects with cannot capture parameter '_ twice the branch for an opaque with an existing use<..> now bails out the same way the branch for an opaque without one does: both check if the lifetime is already captured

…enton Add `Dir` equivalents of `fs::metadata` & `fs::symlink_metadata` This adds methods to `Dir` that allow querying the metadata of files/directories relative to a `Dir`. Miri would [really like](rust-lang/miri#5327) to be able to do this so I figured I'd give it a shot. :) The first commit refactors the Unix `DirEntry` methods a bit with `cfg_select` to avoid repeating the `cfg` condition. Tracking issue: rust-lang#120426 try-jobs: test-x86_64-msvc-1

…smtm Bump min Emscripten version to 4.0, drop deprecated -sWASM_BIGINT for wasm32-unknown-emscripten This documents Emscripten 4.0.0 as the minimum supported version, and removes the on-by-default `-sWASM_BIGINT` link argument from the `wasm32-unknown-emscripten` target spec. `WASM_BIGINT` has been enabled by default since Emscripten 4.0.0 (January 2025), and newer Emscripten versions now emit a deprecation warning whenever it is set explicitly (emscripten-core/emscripten#27558), so every link through rustc currently produces a warning. Since Emscripten's warning categories are not fine-grained enough to suppress this one setting without also disabling `-Wdeprecated` in general, the cleanest fix is to drop the flag and rely on the default. * `-sWASM_BIGINT` removed from the target's post-link args (`-sABORTING_MALLOC=0` is retained) * Platform support docs updated to state the Emscripten 4.0.0 minimum, with the install snippet using `latest` rather than pinning 3.1.68 Rust CI already installs the latest Emscripten release, so no CI changes are needed. Users on Emscripten < 4.0.0 who rely on the prebuilt `std` would need to upgrade or pass `-C link-arg=-sWASM_BIGINT` explicitly.

@maxdexh

…kang Fix incorrect typo suggestion for `struct field` shorthands Fixes rust-lang#163324 by passing the field `Ident` to the suggestion builder to correctly expand unresolved struct shorthands. r? @maxdexh

@oli-obk

…time-capture-suggestion, r=oli-obk do not suggest capturing `'_` twice in `use<...>` for E0700 starting from `use<'_>` with a second anonymous lifetime to capture, E0700 suggests `use<'_, '_>`. that fails with: ``` error: cannot capture parameter `'_` twice ``` then the compiler suggests `use<'_, '_, '_>`. both `AddPreciseCapturing::New` and `AddPreciseCapturing::Existing` are `machine-applicable` (rustc_trait_selection/src/diagnostics.rs:1876 and :1888) so rustfix applies the broken edit. the branch for an opaque without `use<..>` already skips lifetimes that are captured. this adds the same check to the branch for an existing `use<..>`. the issue repro compiles clean on edition 2024 and needs 2021 so the test starts one step in with `use<'_>` already written. two extra cases check the guard stays narrow: `use<>` with one anonymous lifetime still gets `use<'_>` and a named lifetime still gets suggested by name. one note. the guard removes the suggestion without replacing it so someone who already wrote `use<'_>` gets no path forward. a correct suggestion needs to name the elided lifetimes and suggest_precise_capturing cannot do that today. that the multipart suggestion this issue asks for will be the follow up. rust-lang#132199 r? @oli-obk

JonathanBrouwer · 2026-09-29T15:48:15Z

@bors r+ p=5 force

Trying commonly failed jobs
@bors try jobs=dist-various-1,test-various,test-x86_64-gnu-aux,test-x86_64-gnu-llvm-21-3,test-x86_64-msvc-1,test-aarch64-apple-1,test-aarch64-apple-2,test-x86_64-mingw-1,test-i686-msvc,test-armhf-gnu

rust-bors · 2026-09-29T15:48:19Z

📌 Commit 2444fac has been approved by JonathanBrouwer

It is now in the queue for this repository.

Rollup of 4 pull requests try-job: dist-various-1 try-job: test-various try-job: test-x86_64-gnu-aux try-job: test-x86_64-gnu-llvm-21-3 try-job: test-x86_64-msvc-1 try-job: test-aarch64-apple-1 try-job: test-aarch64-apple-2 try-job: test-x86_64-mingw-1 try-job: test-i686-msvc try-job: test-armhf-gnu

rust-bors · 2026-09-29T18:57:32Z

☀️ Try build successful (CI)
Build commit: a859f3f (a859f3fe2dbb26f4de7aa8e0cbfb0c4456465bdb)
Base parent: ea6bb45 (ea6bb45b74c24a026dab4187b1550e97b6985c8a)

rust-bors · 2026-09-29T22:00:33Z

☀️ Test successful - CI
Approved by: JonathanBrouwer
Duration: 3h 9m 8s
Pushing 5c543b0 to main...

github-actions · 2026-09-29T22:03:40Z

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 4853db6 (parent) -> 5c543b0 (this PR)

Test differences

Show 260 test diffs

Stage 1

[ui] tests/ui/impl-trait/precise-capturing/duplicate-anon-lifetime-suggestion-issue-132199.rs: [missing] -> pass (J1)
[ui] tests/ui/resolve/struct-shorthand-typo.rs: [missing] -> pass (J1)
[ui (polonius)] tests/ui/impl-trait/precise-capturing/duplicate-anon-lifetime-suggestion-issue-132199.rs: [missing] -> pass (J3)
[ui (polonius)] tests/ui/resolve/struct-shorthand-typo.rs: [missing] -> pass (J3)
fs::tests::test_dir_self_metadata: [missing] -> pass (J4)

Stage 2

fs::tests::test_dir_self_metadata: [missing] -> pass (J0)
[ui] tests/ui/impl-trait/precise-capturing/duplicate-anon-lifetime-suggestion-issue-132199.rs: [missing] -> pass (J2)
[ui] tests/ui/resolve/struct-shorthand-typo.rs: [missing] -> pass (J2)

Additionally, 252 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 5c543b0b8c73c7b72bc8284ced4fb22ead15734d --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

test-pr-check-1: 20m 34s -> 40m 57s (+99.1%)
test-x86_64-gnu-gcc: 48m 19s -> 1h 22m (+71.2%)
test-x86_64-gnu-stdlib-semver-check: 11m 4s -> 17m 31s (+58.3%)
dist-x86_64-msvc: 1h 58m -> 3h 7m (+57.9%)
test-x86_64-gnu-llvm-21: 39m 42s -> 57m 52s (+45.8%)
test-x86_64-gnu-llvm-22-1: 56m 10s -> 1h 21m (+45.3%)
test-x86_64-gnu-llvm-21-2: 1h 16m -> 1h 44m (+36.7%)
dist-armv7-linux: 1h 8m -> 1h 31m (+33.2%)
test-x86_64-msvc-2: 2h 40m -> 1h 48m (-32.2%)
test-various: 2h 7m -> 1h 26m (-32.1%)

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 · 2026-09-29T22:45:34Z

Finished benchmarking commit (5c543b0): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

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

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)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.6%	[-3.2%, -2.0%]	2
All ❌✅ (primary)	-	-	0

Cycles

Results (primary 2.7%)

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

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

Binary size

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

Bootstrap: 489.608s -> 488.023s (-0.32%)
Artifact size: 406.35 MiB -> 406.34 MiB (-0.00%)

rust-bors · 2026-09-29T23:00:15Z

📌 Perf builds for each rolled up PR:

PR#	Message	Perf Build Sha
#163024	Add `Dir` equivalents of `fs::metadata` & `fs::symlink_meta…	`8a1ec409329f50646ad8d4ff25b62a7ae2a22415` (link)
#162839	Bump min Emscripten version to 4.0, drop deprecated -sWASM_…	`939bfcf4cc06fd9f630b66e58fc6dba37543e7a0` (link)
#163370	Fix incorrect typo suggestion for `struct field` shorthands	`252bb61562d66a30f44bfb15f8d005fc67130672` (link)
#163471	do not suggest capturing `'_` twice in `use<...>` for E0700	`cfbca065c94fcd844f39e241c9ac88759dd560fe` (link)

parent commit: 4853db6f65

In the case of a perf regression, run the following command with the SHAs of each PR you suspect might be the cause: @rust-timer triage $SHA $SHA $SHA..., or run @rust-timer triage all to benchmark all rollup members.

ericachanae19-creator · 2026-10-14T12:50:08Z

        } else {
            let msg = match suggestion.target {
                SuggestionTarget::SimilarlyNamed => format!(
                    "{} {} with a similar name exists",


Gregg Jackson

guybedford and others added 13 commits September 15, 2026 23:16

Drop -sWASM_BIGINT for wasm32-unknown-emscripten, require Emscripten 4.0

8a82083

unix DirEntry: make fallback handling more clear

0cbfdb4

add Dir::(symlink_)metadata_at

49c0a85

reuse Dir::metadata_at code for DirEntry::metadata

cadaa2e

add test for duplicate '_ in precise capturing suggestion

28e388b

the test records what the compiler prints today: for an opaque that already has use<'_> and a second anonymous lifetime to capture, it suggested use<'_, '_>, which doesnt compile

rename metadata_at → metadata (and metadata → self_metadata)

5b172d9

test(resolve): add baseline test for struct shorthand typo suggestions

152237d

fix(resolve): correct typo suggestion for struct field shorthands

ac14be7

Rollup merge of rust-lang#163370 - raushan728:issues/163324, r=chenyu…

dd4bda9

…kang Fix incorrect typo suggestion for `struct field` shorthands Fixes rust-lang#163324 by passing the field `Ident` to the suggestion builder to correctly expand unresolved struct shorthands. r? @maxdexh

rust-bors Bot added the rollup A PR which is a rollup label Sep 29, 2026

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Sep 29, 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 Sep 29, 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 Sep 29, 2026

rust-bors Bot merged commit 5c543b0 into rust-lang:main Sep 29, 2026
15 checks passed

rustbot added this to the 1.101.0 milestone Sep 29, 2026

This was referenced Sep 29, 2026

Miri can do dirfd now #163010

Merged

dirfd misc operations (4/4) #161994

Open

Enable statx on all Linux targets and short-circuit it for musl #159540

Open

Primajin mentioned this pull request Sep 30, 2026

Apply .gitattributes syntax highlighting to code-review refined-github/refined-github#10157

Closed

github-actions Bot mentioned this pull request Oct 3, 2026

Toolchain upgrade to nightly-2026-10-11 flux-rs/flux#1811

Merged

ericachanae19-creator reviewed Oct 14, 2026

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Rollup of 4 pull requests - #163493

Rollup of 4 pull requests#163493
rust-bors[bot] merged 13 commits into
rust-lang:mainfrom
JonathanBrouwer:rollup-B0z7Ynf

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Test differences

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Overall result: no relevant changes - no action needed

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