Rollup of 14 pull requests by JonathanBrouwer · Pull Request #163244 · rust-lang/rust

JonathanBrouwer · 2026-09-24T07:38:22Z

Successful merges:

fix quadratic naming of duplicate sidebar links #162976 (fix quadratic naming of duplicate sidebar links)
Refactor core::cmp::{smallest, largest} & add mir-opt test #161275 (Refactor core::cmp::{smallest, largest} & add mir-opt test)
cg_llvm: Use fewer FFI calls to check the target CPU's features #163143 (cg_llvm: Use fewer FFI calls to check the target CPU's features)
Adjust for Arm64EC name mangling when checking for exported symbols #163188 (Adjust for Arm64EC name mangling when checking for exported symbols)
rustc_builtin_macros cleanup, part 6 #163211 (rustc_builtin_macros cleanup, part 6)
Don't merge distinct impl candidates #161386 (Don't merge distinct impl candidates)
Remove StashKey::AssociatedTypeSuggestion #162942 (Remove StashKey::AssociatedTypeSuggestion)
Don't suggest std:: rustfix paths in #![no_std] crates #163096 (Don't suggest std:: rustfix paths in #![no_std] crates)
Mark std::os::wasip2 with correct doc-cfgs, mark as unstable #163110 (Mark std::os::wasip2 with correct doc-cfgs, mark as unstable)
properly decrement available_depth on cycles and provisional cache hits #163185 (properly decrement available_depth on cycles and provisional cache hits)
revert r14 register names for arm #163214 (revert r14 register names for arm)
miri subtree update #163226 (miri subtree update)
Add regression test for trait predicate with escaping bounds #163228 (Add regression test for trait predicate with escaping bounds)
rustc_dump_symbol_name: add demangling information as a note instead #163234 (rustc_dump_symbol_name: add demangling information as a note instead)

…+activate

VSCode settings: disable diagnostics as RA shows many false positives

This updates the rust-version file to 88638df.

Pull recent changes from https://github.com/rust-lang/rust via Josh. Previous upstream ref: rust-lang/rust@feaadee New upstream ref: rust-lang/rust@88638df Filtered ref: rust-lang/miri@a3ebd7e Upstream diff: rust-lang/rust@feaadee...88638df This merge was created using https://github.com/rust-lang/josh-sync.

Automatic Rustup

…nd add docs

…_or_flounder helpers

Add `miri.toml` config file for `./miri` script

fix #[path] in doctest

…tfix

JonathanBrouwer · 2026-09-24T07:38:31Z

@bors r+ p=5

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 · 2026-09-24T07:38:34Z

📌 Commit 6c262ac has been approved by JonathanBrouwer

It is now in the queue for this repository.

Rollup of 14 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 · 2026-09-24T10:24:17Z

☀️ Try build successful (CI)
Build commit: 4f8b892 (4f8b892f7552faed40ab17f346fe069c1a6248ec)
Base parent: 3670d25 (3670d2532bdf51abbe0b8fea22284d7ca340ffe3)

rust-bors · 2026-09-24T14:18:23Z

☀️ Test successful - CI
Approved by: JonathanBrouwer
Duration: 3h 30m 21s
Pushing 2350b22 to main...

github-actions · 2026-09-24T14:22:00Z

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 ad2e756 (parent) -> 2350b22 (this PR)

Test differences

Show 145 test diffs

Stage 1

[ui] tests/ui/asm/thumbv6m-clobber-abi-r14.rs: [missing] -> pass (J0)
[ui] tests/ui/lint/fn-ptr-comparisons-no_std.rs: [missing] -> pass (J0)
[ui] tests/ui/lint/int_to_ptr-no_core.rs: [missing] -> pass (J0)
[ui] tests/ui/lint/int_to_ptr-no_std.rs: [missing] -> pass (J0)
[ui] tests/ui/lint/undropped_manually_drops-no_std.rs: [missing] -> pass (J0)
[ui] tests/ui/lint/wide_pointer_comparisons-no_std.rs: [missing] -> pass (J0)
[ui] tests/ui/macros/non-fmt-panic-no_std-extern-std.rs: [missing] -> pass (J0)
[ui] tests/ui/macros/non-fmt-panic-no_std.rs: [missing] -> pass (J0)
[ui] tests/ui/traits/next-solver/ambiguous-impl-in-resolve.rs: pass -> [missing] (J0)
[ui] tests/ui/traits/next-solver/ambiguous-impl-in-resolve.rs#next: [missing] -> pass (J0)
[ui] tests/ui/traits/next-solver/ambiguous-impl-in-resolve.rs#old: [missing] -> pass (J0)
[ui] tests/ui/traits/next-solver/overflow/cycle-required-depth.rs: [missing] -> pass (J0)
[ui] tests/ui/traits/next-solver/overflow/provisional-cache-required-depth.rs: [missing] -> pass (J0)
[ui] tests/ui/traits/trait-predicate-with-escaping-bounds.rs: [missing] -> pass (J0)
[codegen] tests/codegen-llvm/asm-arm-r14.rs#LLVM22: pass -> [missing] (J2)
[mir-opt] tests/mir-opt/pre-codegen/cmp_splat.rs: [missing] -> pass (J2)
[rustdoc-html] tests/rustdoc-html/deref/sidebar-links-deref-chain.rs: [missing] -> pass (J2)
[ui (polonius)] tests/ui/asm/thumbv6m-clobber-abi-r14.rs: [missing] -> pass (J4)
[ui (polonius)] tests/ui/lint/fn-ptr-comparisons-no_std.rs: [missing] -> pass (J4)
[ui (polonius)] tests/ui/lint/int_to_ptr-no_core.rs: [missing] -> pass (J4)
[ui (polonius)] tests/ui/lint/int_to_ptr-no_std.rs: [missing] -> pass (J4)
[ui (polonius)] tests/ui/lint/undropped_manually_drops-no_std.rs: [missing] -> pass (J4)
[ui (polonius)] tests/ui/lint/wide_pointer_comparisons-no_std.rs: [missing] -> pass (J4)
[ui (polonius)] tests/ui/macros/non-fmt-panic-no_std-extern-std.rs: [missing] -> pass (J4)
[ui (polonius)] tests/ui/macros/non-fmt-panic-no_std.rs: [missing] -> pass (J4)
[ui (polonius)] tests/ui/traits/next-solver/ambiguous-impl-in-resolve.rs: pass -> [missing] (J4)
[ui (polonius)] tests/ui/traits/next-solver/ambiguous-impl-in-resolve.rs#next: [missing] -> pass (J4)
[ui (polonius)] tests/ui/traits/next-solver/ambiguous-impl-in-resolve.rs#old: [missing] -> pass (J4)
[ui (polonius)] tests/ui/traits/next-solver/overflow/cycle-required-depth.rs: [missing] -> pass (J4)
[ui (polonius)] tests/ui/traits/next-solver/overflow/provisional-cache-required-depth.rs: [missing] -> pass (J4)
[ui (polonius)] tests/ui/traits/trait-predicate-with-escaping-bounds.rs: [missing] -> pass (J4)
[codegen] tests/codegen-llvm/asm-arm-r14.rs#LLVM23: ignore (ignored when the LLVM version 22.1.2 is older than 23.0.0) -> [missing] (J7)
[codegen] tests/codegen-llvm/asm-arm-r14.rs#LLVM23: ignore (ignored when the LLVM version 21.1.2 is older than 23.0.0) -> [missing] (J9)
[codegen] tests/codegen-llvm/asm-arm-r14.rs: [missing] -> pass (J13)
[codegen] tests/codegen-llvm/asm-arm-r14.rs#LLVM22: ignore (ignored when the LLVM version (23.1.1) is newer than majorversion 22) -> [missing] (J15)
[codegen] tests/codegen-llvm/asm-arm-r14.rs#LLVM23: pass -> [missing] (J15)

Stage 2

[codegen] tests/codegen-llvm/asm-arm-r14.rs#LLVM22: pass -> [missing] (J1)
[mir-opt] tests/mir-opt/pre-codegen/cmp_splat.rs: [missing] -> pass (J3)
[ui] tests/ui/lint/fn-ptr-comparisons-no_std.rs: [missing] -> pass (J5)
[ui] tests/ui/lint/int_to_ptr-no_core.rs: [missing] -> pass (J5)
[ui] tests/ui/lint/int_to_ptr-no_std.rs: [missing] -> pass (J5)
[ui] tests/ui/lint/undropped_manually_drops-no_std.rs: [missing] -> pass (J5)
[ui] tests/ui/lint/wide_pointer_comparisons-no_std.rs: [missing] -> pass (J5)
[ui] tests/ui/macros/non-fmt-panic-no_std-extern-std.rs: [missing] -> pass (J5)
[ui] tests/ui/macros/non-fmt-panic-no_std.rs: [missing] -> pass (J5)
[ui] tests/ui/traits/next-solver/ambiguous-impl-in-resolve.rs: pass -> [missing] (J5)
[ui] tests/ui/traits/next-solver/ambiguous-impl-in-resolve.rs#next: [missing] -> pass (J5)
[ui] tests/ui/traits/next-solver/ambiguous-impl-in-resolve.rs#old: [missing] -> pass (J5)
[ui] tests/ui/traits/next-solver/overflow/cycle-required-depth.rs: [missing] -> pass (J5)
[ui] tests/ui/traits/next-solver/overflow/provisional-cache-required-depth.rs: [missing] -> pass (J5)
[ui] tests/ui/traits/trait-predicate-with-escaping-bounds.rs: [missing] -> pass (J5)
[codegen] tests/codegen-llvm/asm-arm-r14.rs#LLVM23: ignore (ignored when the LLVM version 22.1.2 is older than 23.0.0) -> [missing] (J6)
[ui] tests/ui/asm/thumbv6m-clobber-abi-r14.rs: [missing] -> ignore (gcc backend is marked as ignore) (J8)
[ui] tests/ui/asm/thumbv6m-clobber-abi-r14.rs: [missing] -> pass (J10)
[codegen] tests/codegen-llvm/asm-arm-r14.rs#LLVM22: ignore (ignored when the LLVM version (23.1.1) is newer than majorversion 22) -> [missing] (J11)
[codegen] tests/codegen-llvm/asm-arm-r14.rs#LLVM23: pass -> [missing] (J11)
[codegen] tests/codegen-llvm/asm-arm-r14.rs#LLVM23: ignore (ignored when the LLVM version 21.1.2 is older than 23.0.0) -> [missing] (J12)
[codegen] tests/codegen-llvm/asm-arm-r14.rs: [missing] -> pass (J14)
[rustdoc-html] tests/rustdoc-html/deref/sidebar-links-deref-chain.rs: [missing] -> pass (J16)

Additionally, 86 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 2350b22a89d30fe814a299a73c9ab83c72cafaf3 --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-i686-msvc: 33m 7s -> 56m 29s (+70.6%)
test-x86_64-gnu-llvm-21-2: 1h 4m -> 1h 47m (+65.8%)
test-x86_64-gnu-next-trait-solver-polonius: 39m 29s -> 1h 2m (+58.0%)
test-x86_64-gnu-debug: 1h 24m -> 2h 11m (+56.5%)
test-x86_64-gnu-stdlib-semver-check: 11m 37s -> 17m 47s (+53.1%)
test-x86_64-msvc-ext1: 1h 35m -> 2h 25m (+52.6%)
test-x86_64-msvc-ext3: 1h 21m -> 2h 2m (+49.6%)
test-x86_64-mingw-2: 1h 51m -> 2h 40m (+44.3%)
test-aarch64-msvc-2: 1h 19m -> 1h 54m (+43.8%)
test-x86_64-gnu-stable: 1h 51m -> 2h 37m (+41.7%)

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 · 2026-09-24T15:03:42Z

Finished benchmarking commit (2350b22): comparison URL.

Overall result: ❌✅ regressions and improvements - 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)	0.5%	[0.2%, 0.9%]	9
Regressions ❌ (secondary)	0.7%	[0.3%, 1.2%]	9
Improvements ✅ (primary)	-0.4%	[-0.5%, -0.3%]	12
Improvements ✅ (secondary)	-41.4%	[-82.5%, -0.3%]	2
All ❌✅ (primary)	0.0%	[-0.5%, 0.9%]	21

Max RSS (memory usage)

Results (primary 1.6%, 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)	3.1%	[1.2%, 5.9%]	3
Regressions ❌ (secondary)	1.1%	[0.7%, 1.6%]	2
Improvements ✅ (primary)	-0.5%	[-0.6%, -0.5%]	2
Improvements ✅ (secondary)	-2.9%	[-2.9%, -2.9%]	1
All ❌✅ (primary)	1.6%	[-0.6%, 5.9%]	5

Cycles

Results (primary 11.8%, secondary -6.9%)

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

	mean	range	count
Regressions ❌ (primary)	11.8%	[4.2%, 19.5%]	6
Regressions ❌ (secondary)	4.1%	[2.7%, 6.5%]	6
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-39.6%	[-71.8%, -7.5%]	2
All ❌✅ (primary)	11.8%	[4.2%, 19.5%]	6

Binary size

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

Bootstrap: 488.946s -> 488.976s (0.01%)
Artifact size: 406.30 MiB -> 406.16 MiB (-0.03%)

rust-bors · 2026-09-24T15:20:17Z

📌 Perf builds for each rolled up PR:

PR#	Message	Perf Build Sha
#162976	fix quadratic naming of duplicate sidebar links	`303bef350b43f48d1834ce0e52f291d7e32f5d9d` (link)
#161275	Refactor `core::cmp::{smallest, largest}` & add `mir-opt` t…	`8d001ebf024ce2c5ed81561e5b4aaea197a23239` (link)
#163143	cg_llvm: Use fewer FFI calls to check the target CPU's feat…	`acd0c7af907a4c8de0da4d0bb2043b13d1381af8` (link)
#163188	Adjust for Arm64EC name mangling when checking for exported…	`b872e20a9637343fc5b1129140cdc5fe67770463` (link)
#163211	`rustc_builtin_macros` cleanup, part 6	`4e5440123e09cd68d084506cc634a8f0671d7498` (link)
#161386	Don't merge distinct impl candidates	`e7df56e4b0796402dbd534ec1c5d96abc9858673` (link)
#162942	Remove `StashKey::AssociatedTypeSuggestion`	`80b8df54048820b30e736601072791ff0f9c5cc3` (link)
#163096	Don't suggest `std::` rustfix paths in `#![no_std]` crates	`e5b71cebcc627a77ad180c429e1bbf5c22e13f27` (link)
#163110	Mark `std::os::wasip2` with correct doc-cfgs, mark as unsta…	`50d97eca1514353ce5d3209d5c614156511e5108` (link)
#163185	properly decrement available_depth on cycles and provisiona…	`8923148217d01db2d40efd88721456a4ac02f946` (link)
#163214	revert r14 register names for arm	`e7dcfb08e909956a5ddfb828e73cfc0bce2cdb76` (link)
#163226	miri subtree update	`8d1c0852c5f442c0489eb9a7218a697281be5348` (link)
#163228	Add regression test for trait predicate with escaping bounds	`3d2048517dfccd7e442f79d7575a9a78ddf025a2` (link)
#163234	`rustc_dump_symbol_name`: add demangling information as a n…	`1651490e6fdab1cbb1f78fd214202caf0333e9b9` (link)

parent commit: ad2e756c70

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.

panstromek · 2026-09-24T17:56:50Z

@rust-timer triage all

rust-timer · 2026-09-24T17:56:55Z

Running triage with 9 benchmarks

Triage only executes the benchmarks on rollup members, that were changed significantly on the rollup.
For this rollup, these benchmarks are:

bitmaps-3.2.1-new-solver
ctfe-stress-5
deref-sidebar-stress
eza-0.21.2
libc-0.2.172
many-assoc-items
match-stress
stm32f4-0.15.1
unicode-normalization-0.1.24

#162976 `303bef3` fix quadratic naming of duplicate sidebar links

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
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-82.5%	[-82.5%, -82.5%]	1
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

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

Cycles

Results (secondary -34.5%)

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)	3.0%	[3.0%, 3.0%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-72.0%	[-72.0%, -72.0%]	1
All ❌✅ (primary)	-	-	0

Binary size

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

#161275 `8d001eb` Refactor `core::cmp::{smallest, largest}` & add `mir-opt` test

This perf run didn't have relevant results for the `instruction count` metric.

Instruction count

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

Max RSS (memory usage)

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)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.9%	[-0.9%, -0.9%]	1
All ❌✅ (primary)	-	-	0

Cycles

Results (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)	-	-	0
Regressions ❌ (secondary)	3.1%	[3.1%, 3.1%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

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

#163143 `acd0c7a` cg_llvm: Use fewer FFI calls to check the target CPU's features

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)	0.9%	[0.8%, 0.9%]	5
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (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)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-1.1%	[-1.1%, -1.1%]	1
All ❌✅ (primary)	-	-	0

Cycles

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

Binary size

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

#163188 `b872e20` Adjust for Arm64EC name mangling when checking for exported symbols

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)	0.9%	[0.8%, 0.9%]	5
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (secondary -0.8%)

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)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.8%	[-0.8%, -0.8%]	1
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

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

#163211 `4e54401` `rustc_builtin_macros` cleanup, part 6

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)	0.6%	[0.2%, 0.9%]	8
Regressions ❌ (secondary)	0.8%	[0.6%, 0.9%]	5
Improvements ✅ (primary)	-0.4%	[-0.5%, -0.3%]	12
Improvements ✅ (secondary)	-0.3%	[-0.3%, -0.3%]	1
All ❌✅ (primary)	-0.0%	[-0.5%, 0.9%]	20

Max RSS (memory usage)

Results (primary -0.6%, secondary -0.7%)

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
Improvements ✅ (primary)	-0.6%	[-0.6%, -0.6%]	2
Improvements ✅ (secondary)	-0.7%	[-0.7%, -0.7%]	1
All ❌✅ (primary)	-0.6%	[-0.6%, -0.6%]	2

Cycles

Results (secondary 2.9%)

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)	2.9%	[2.9%, 2.9%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

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

#161386 `e7df56e` Don't merge distinct impl candidates

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)	0.8%	[0.6%, 0.9%]	3
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (secondary -0.7%)

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
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.7%	[-0.7%, -0.7%]	1
All ❌✅ (primary)	-	-	0

Cycles

Results (secondary 3.0%)

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)	3.0%	[3.0%, 3.0%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

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

#162942 `80b8df5` Remove `StashKey::AssociatedTypeSuggestion`

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)	0.9%	[0.8%, 1.2%]	5
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

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)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.9%	[-0.9%, -0.9%]	1
All ❌✅ (primary)	-	-	0

Cycles

Results (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
Regressions ❌ (secondary)	1.9%	[0.6%, 3.3%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

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

#163096 `e5b71ce` Don't suggest `std::` rustfix paths in `#![no_std]` crates

This perf run didn't have relevant results for the `instruction count` metric.

Instruction count

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

Max RSS (memory usage)

Results (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)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-1.1%	[-1.1%, -1.1%]	1
All ❌✅ (primary)	-	-	0

Cycles

Results (secondary 2.7%)

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)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

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

#163110 `50d97ec` Mark `std::os::wasip2` with correct doc-cfgs, mark as unstable

This perf run didn't have relevant results for the `instruction count` metric.

Instruction count

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

Max RSS (memory usage)

Results (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)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-1.1%	[-1.1%, -1.1%]	1
All ❌✅ (primary)	-	-	0

Cycles

Results (secondary 2.9%)

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)	2.9%	[2.9%, 2.9%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

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

#163185 `8923148` properly decrement available_depth on cycles and provisional cache hits

This perf run didn't have relevant results for the `instruction count` metric.

Instruction count

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

Max RSS (memory usage)

Results (secondary -0.7%)

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
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.7%	[-0.7%, -0.7%]	1
All ❌✅ (primary)	-	-	0

Cycles

Results (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)	1.8%	[0.7%, 2.9%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

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

#163214 `e7dcfb0` revert r14 register names for arm

This perf run didn't have relevant results for the `instruction count` metric.

Instruction count

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

Max RSS (memory usage)

Results (secondary -0.7%)

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
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.7%	[-0.7%, -0.7%]	1
All ❌✅ (primary)	-	-	0

Cycles

Results (secondary 3.4%)

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)	3.4%	[3.4%, 3.4%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

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

#163226 `8d1c085` miri subtree update

This perf run didn't have relevant results for the `instruction count` metric.

Instruction count

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

Max RSS (memory usage)

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)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.9%	[-0.9%, -0.9%]	1
All ❌✅ (primary)	-	-	0

Cycles

Results (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)	-	-	0
Regressions ❌ (secondary)	2.8%	[2.8%, 2.8%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

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

#163228 `3d20485` Add regression test for trait predicate with escaping bounds

This perf run didn't have relevant results for the `instruction count` metric.

Instruction count

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

Max RSS (memory usage)

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)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.9%	[-0.9%, -0.9%]	1
All ❌✅ (primary)	-	-	0

Cycles

Results (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)	-	-	0
Regressions ❌ (secondary)	3.1%	[3.1%, 3.1%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

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

#163234 `1651490` `rustc_dump_symbol_name`: add demangling information as a note instead

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)	0.8%	[0.8%, 0.9%]	4
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (secondary -1.2%)

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)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-1.2%	[-1.4%, -1.0%]	2
All ❌✅ (primary)	-	-	0

Cycles

Results (secondary 3.5%)

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

Binary size

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

RalfJung and others added 30 commits August 29, 2026 09:54

move .auto settings into miri.toml file

7029337

add ./miri toolchain --name to configure which toolchain to install…

4924c57

…+activate

miri.toml: allow configuring the default toolchain name

937d7a2

miri.toml: allow configuring toolchain components

c28b273

add trait_is_marker to Interner

7e43fd2

fix quadratic naming of duplicate sidebar links

9630065

Add std_or_core helper for crate-qualified rustfix paths

8955f77

Use std_or_core in undropped_manually_drops rustfix

4238ee3

simplify get_next_url to a single counter map

1875276

RA settings: disable diagnostics as RA shows many false positives

447bb32

Mark std::os::wasip2 with correct doc-cfgs, mark as unstable

e4ad05b

Merge pull request rust-lang#5338 from RalfJung/vscode-settings

1f28dfc

VSCode settings: disable diagnostics as RA shows many false positives

don't merge distinct impl candidates

819623a

drop specialized impls with equal inference constraints

f002f33

Prepare for merging from rust-lang/rust

5a61e9c

This updates the rust-version file to 88638df.

Merge pull request rust-lang#5340 from rust-lang/rustup-2026-09-22

fd49fb3

Automatic Rustup

update fallout tests

d86cf85

add tests

0adc046

replace has_distinct_impl_candidates with try_merge_impl_candidates a…

781bc2b

…nd add docs

add merge_candidates_or_bail_with_ambiguity and merge_impl_candidates…

b49ec62

…_or_flounder helpers

Remove flounder from merge_trait_candidates

0c27f4b

Merge pull request rust-lang#5289 from RalfJung/miri.toml

c85e050

Add `miri.toml` config file for `./miri` script

also apply late discriminant comparison optimization to derive(Ord)

51fa7ee

add test for #[path] in doctest

3e06823

forward rustdoc env vars to doctests

e53b292

Merge pull request rust-lang#5342 from RalfJung/doctest-path

b2e7048

fix #[path] in doctest

Use std_or_core in integer_to_ptr_transmutes rustfix

4858117

Use std_or_core in ambiguous_wide_pointer_comparisons rustfix

711d861

Use std_or_core in unpredictable_function_pointer_comparisons rus…

ed84ade

…tfix

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 24, 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 24, 2026

rust-bors Bot merged commit 2350b22 into rust-lang:main Sep 24, 2026
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rustbot added this to the 1.100.0 milestone Sep 24, 2026

This was referenced Sep 24, 2026

rustdoc: add disambiguators for identically named method in sidebar #162778

Open

Fix a splat legacy demangling display bug #160050

Open

rustbot added the perf-regression Performance regression. label Sep 24, 2026

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github-actions Bot commented Sep 24, 2026

Test differences

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rust-timer commented Sep 24, 2026

Overall result: ❌✅ regressions and improvements - please read:

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panstromek commented Sep 24, 2026

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rust-timer commented Sep 24, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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#162976 303bef3 fix quadratic naming of duplicate sidebar links

#161275 8d001eb Refactor core::cmp::{smallest, largest} & add mir-opt test

#163143 acd0c7a cg_llvm: Use fewer FFI calls to check the target CPU's features

#163188 b872e20 Adjust for Arm64EC name mangling when checking for exported symbols

#163211 4e54401 rustc_builtin_macros cleanup, part 6

#161386 e7df56e Don't merge distinct impl candidates

#162942 80b8df5 Remove StashKey::AssociatedTypeSuggestion

#163096 e5b71ce Don't suggest std:: rustfix paths in #![no_std] crates

#163110 50d97ec Mark std::os::wasip2 with correct doc-cfgs, mark as unstable

#163185 8923148 properly decrement available_depth on cycles and provisional cache hits

#163214 e7dcfb0 revert r14 register names for arm

#163226 8d1c085 miri subtree update

#163228 3d20485 Add regression test for trait predicate with escaping bounds

#163234 1651490 rustc_dump_symbol_name: add demangling information as a note instead

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rust-timer commented Sep 24, 2026 •

edited

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#162976 `303bef3` fix quadratic naming of duplicate sidebar links

#161275 `8d001eb` Refactor `core::cmp::{smallest, largest}` & add `mir-opt` test

#163143 `acd0c7a` cg_llvm: Use fewer FFI calls to check the target CPU's features

#163188 `b872e20` Adjust for Arm64EC name mangling when checking for exported symbols

#163211 `4e54401` `rustc_builtin_macros` cleanup, part 6

#161386 `e7df56e` Don't merge distinct impl candidates

#162942 `80b8df5` Remove `StashKey::AssociatedTypeSuggestion`

#163096 `e5b71ce` Don't suggest `std::` rustfix paths in `#![no_std]` crates

#163110 `50d97ec` Mark `std::os::wasip2` with correct doc-cfgs, mark as unstable

#163185 `8923148` properly decrement available_depth on cycles and provisional cache hits

#163214 `e7dcfb0` revert r14 register names for arm

#163226 `8d1c085` miri subtree update

#163228 `3d20485` Add regression test for trait predicate with escaping bounds

#163234 `1651490` `rustc_dump_symbol_name`: add demangling information as a note instead