Rollup of 28 pull requests by JonathanBrouwer · Pull Request #159966 · rust-lang/rust

JonathanBrouwer · 2026-07-26T13:47:31Z

Successful merges:

bootstrap: Split the Step trait into multiple traits #159638 (bootstrap: Split the Step trait into multiple traits)
rustc_trait_selection: fix trait solver hang caused by degenerate obligations #159774 (rustc_trait_selection: fix trait solver hang caused by degenerate obligations)
line-tables-only test: check that the line number matches the function name #159837 (line-tables-only test: check that the line number matches the function name)
Update Enzyme submodule to imporve llvm-cov #159946 (Update Enzyme submodule to imporve llvm-cov)
miri subtree update #159962 (miri subtree update)
tests: extend remap-path-prefix-std to all stdlib rlibs #156570 (tests: extend remap-path-prefix-std to all stdlib rlibs)
Fix up #[linkage] target checking #159617 (Fix up #[linkage] target checking)
Improve workings of attribute suggestions #159633 (Improve workings of attribute suggestions)
std: Switch implementations of thread_local! for WASI #159733 (std: Switch implementations of thread_local! for WASI)
Check unsafe impls on safe EIIs #159783 (Check unsafe impls on safe EIIs)
Add tuple never coercion collection regression test #159810 (Add tuple never coercion collection regression test)
Remove redundant #[rustc_paren_sugar] feature gate #159826 (Remove redundant #[rustc_paren_sugar] feature gate)
Implement str::copy_from_str #159846 (Implement str::copy_from_str)
rustc_parse: Stop returning Option from statement parsing #159849 (rustc_parse: Stop returning Option from statement parsing)
Updated expect messages for CString struct and method documentation #159853 (Updated expect messages for CString struct and method documentation)
More cleanup in rustc_attr_parsing #159875 (More cleanup in rustc_attr_parsing)
Update expect messages in library/alloc/boxed.rs and library/alloc/string.rs to follow the style guide #159882 (Update expect messages in library/alloc/boxed.rs and library/alloc/string.rs to follow the style guide)
Split multiline derives into std/rustc macros #159891 (Split multiline derives into std/rustc macros)
Fix find_attr hygiene and rustc_hir cleanups #159893 (Fix find_attr hygiene and rustc_hir cleanups)
rustc-dev-guide subtree update #159895 (rustc-dev-guide subtree update)
Clarify that the expected runtime symbols signature is for the current target only #159902 (Clarify that the expected runtime symbols signature is for the current target only)
Fix error in diagnostic on_unmatched_args #159914 (Fix error in diagnostic on_unmatched_args)
spare capacity mut constification #159917 (spare capacity mut constification)
rename abort_unwind → abort_on_unwind #159918 (rename abort_unwind → abort_on_unwind)
Remove sve2 from the ImpliedFeatures of AArch64 v9a. #159927 (Remove sve2 from the ImpliedFeatures of AArch64 v9a.)
Minor rustc_ast::ast doc cleanups #159936 (Minor rustc_ast::ast doc cleanups)
Update expect messages in library/core/src/ptr/non_null.rs #159945 (Update expect messages in library/core/src/ptr/non_null.rs)
Add CFI tests for return types and never type #159950 (Add CFI tests for return types and never type)

Use `local_to_op` and the operand storage shape to render initialized immediate locals through Miri's Immediate display implementation. Keep mplace-backed locals as `<indirect>` for now, preserve explicit dead/uninit states, and expose interpreter errors in `LocalDesc`.value. Add value-shape and metadata-sized local fixtures for the next indirect rendering slices.

Resolve allocation-backed mplace locals and display their allocation contents with dump_alloc. Keep unsupported provenance as <indirect> and update the fixtures for the temporary diagnostic allocation output.

This updates the rust-version file to c904ba3.

Pull recent changes from https://github.com/rust-lang/rust via Josh. Upstream ref: rust-lang/rust@c904ba3 Filtered ref: rust-lang/miri@d686e0d Upstream diff: rust-lang/rust@4a9d536...c904ba3 This merge was created using https://github.com/rust-lang/josh-sync.

Automatic Rustup

Replace the diagnostic dump_alloc output with a Priroda-owned byte renderer for mplace-backed locals. Compute the current value size with size_and_align_of_val, inspect only the mplace byte range, and render uninitialized bytes with an explicit marker.

Render complete pointer provenance while dumping indirect local values. Preserve initialized and uninitialized byte ranges, including padding and partial pointer bytes, and report unsupported unsized values explicitly. Add UI coverage for pointer positions, nonzero target offsets, uninitialized regions, and partial provenance.

Add a `follow` command that renders allocation bytes starting at a given allocation offset, reusing the provenance-aware allocation byte renderer used for indirect locals. Document the command and cover following a rendered pointer allocation in the pointer-rendering UI test.

…dling [Priroda] Render indirect local values

support `neon.tbl*` intrinsics

When using `RUSTFLAGS="-Ctarget-features=+avx512f"`, the Rust compiler complains: error: unknown codegen option: `target-features` The actual option uses the singular form.

…eature-typo readme: fix misspelling of `-Ctarget-feature`

add a riscv target to CI

This updates the rust-version file to 1af98b7.

Pull recent changes from https://github.com/rust-lang/rust via Josh. Upstream ref: rust-lang/rust@1af98b7 Filtered ref: rust-lang/miri@c4103d8 Upstream diff: rust-lang/rust@c904ba3...1af98b7 This merge was created using https://github.com/rust-lang/josh-sync.

…nsic support" This reverts commit 785e740bb5c1d9166717c93612f7b9f99fee1caf. The additional intrinsic support has meanwhile been implemented.

Rustup

This commit is a change for all WASI targets to use a different underlying implementation in the standard library for `thread_local!`. Previously all wasm targets, without the `atomics` feature, were funneled into the `no_threads` implementation and various fallbacks in the `thread_local` module. The upcoming `wasm32-wasip3` target, however, will actually have threads and will need different treatment. Additionally the modules that `wasm32-wasip3` needs all already work on all other WASI targets as well -- for example the `pthread_*` symbols needed to manage destructors are exposed by `wasi-libc`. The end result is that the `wasm32-wasip3` target will be "ready for threads" as soon as `wasi-libc` has support. Other targets shouldn't have any functional difference from before, too.

This updates the rust-version file to 390279b.

Pull recent changes from https://github.com/rust-lang/rust via Josh. Upstream ref: rust-lang/rust@390279b Filtered ref: rust-lang/miri@161dd69 Upstream diff: rust-lang/rust@1af98b7...390279b This merge was created using https://github.com/rust-lang/josh-sync.

Add a CLI fixture covering a projected memory-backed field inside a larger aggregate. This locks in that projected values render only their own MPlace layout bytes instead of trailing bytes from the parent allocation.

Keep projected MIR Places long enough to evaluate them with `eval_place_to_op`, then reuse the existing raw operand renderer for immediate and memory-backed values. This removes `<unsupported-projection>` from projected locals, including fields, enum projections, references, and dereferences. Update the projected debug-info UI expectations and verify the full Priroda suite.

Automatic Rustup

[Priroda] Render projected debug-info values

JonathanBrouwer · 2026-07-26T20:52:51Z

Omg it's spurious that explains why it was so weird...
@bors retry

rust-bors · 2026-07-26T20:52:53Z

❗ You can only retry pull requests that are approved and have a previously failed auto build.

JonathanBrouwer · 2026-07-26T20:53:03Z

@bors r+

rust-bors · 2026-07-26T20:53:06Z

📌 Commit e6a1a8f has been approved by JonathanBrouwer

It is now in the queue for this repository.

JonathanBrouwer · 2026-07-26T20:53:56Z

@bors treeopen
It has been relatively well behaved I think?

rust-bors · 2026-07-26T20:53:59Z

Tree is now open for merging.

rust-log-analyzer · 2026-07-27T01:53:43Z

The job optional-x86_64-gnu-parallel-frontend failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

diff of stderr:

20 LL | |     Self::Item: Baz,
21    | |____________________^
22    = note: ...which again requires coherence checking all impls of trait `Foo`, completing the cycle
- note: cycle used when checking that `<impl at $DIR/next-solver-region-resolution.rs:12:1: 14:20>` is well-formed
-   --> $DIR/next-solver-region-resolution.rs:12:1
+ note: cycle used when checking that `<impl at $DIR/next-solver-region-resolution.rs:18:1: 20:21>` is well-formed
+   --> $DIR/next-solver-region-resolution.rs:18:1
25    |
- LL | / impl<'a, T> Foo for &'a T
+ LL | / impl<'a, T> Foo for &T
27 LL | | where
- LL | |     Self::Item: 'a,
-    | |___________________^
+ LL | |     Self::Item: Baz,
+    | |____________________^
30    = note: for more information, see <https://rustc-dev-guide.rust-lang.org/overview.html#queries> and <https://rustc-dev-guide.rust-lang.org/query.html>
31 
32 error: aborting due to 1 previous error

Note: some mismatched output was normalized before being compared
- note: cycle used when checking that `<impl at /checkout/tests/ui/specialization/min_specialization/next-solver-region-resolution.rs:18:1: 20:21>` is well-formed
-   --> /checkout/tests/ui/specialization/min_specialization/next-solver-region-resolution.rs:18:1
+ note: cycle used when checking that `<impl at $DIR/next-solver-region-resolution.rs:18:1: 20:21>` is well-formed
+   --> $DIR/next-solver-region-resolution.rs:18:1
+ LL | / impl<'a, T> Foo for &T
+ LL | |     Self::Item: Baz,
+    | |____________________^

Compare output by lines enabled, diff by lines:
Expected contains these lines that are not in actual:
   | |___________________^
  --> $DIR/next-solver-region-resolution.rs:12:1
LL | / impl<'a, T> Foo for &'a T
LL | |     Self::Item: 'a,
note: cycle used when checking that `<impl at $DIR/next-solver-region-resolution.rs:12:1: 14:20>` is well-formed
Actual contains these lines that are not in expected:
   | |____________________^
  --> $DIR/next-solver-region-resolution.rs:18:1
LL | / impl<'a, T> Foo for &T
LL | |     Self::Item: Baz,
note: cycle used when checking that `<impl at $DIR/next-solver-region-resolution.rs:18:1: 20:21>` is well-formed

The actual stderr differed from the expected stderr
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args specialization/min_specialization/next-solver-region-resolution.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/specialization/min_specialization/next-solver-region-resolution.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "-Zthreads=4" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/specialization/min_specialization/next-solver-region-resolution" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-Znext-solver=globally"
stdout: none
--- stderr -------------------------------
error[E0391]: cycle detected when coherence checking all impls of trait `Foo`
##[error]  --> /checkout/tests/ui/specialization/min_specialization/next-solver-region-resolution.rs:6:1
   |
LL | trait Foo { //~ ERROR cycle detected when coherence checking all impls of trait `Foo`
   | ^^^^^^^^^
   |
   = note: ...which requires building specialization graph of trait `Foo`...
note: ...which requires computing whether impls specialize one another...
  --> /checkout/tests/ui/specialization/min_specialization/next-solver-region-resolution.rs:12:1
   |
LL | / impl<'a, T> Foo for &'a T
LL | | where
LL | |     Self::Item: 'a,
   | |___________________^
note: ...which requires computing normalized predicates of `<impl at /checkout/tests/ui/specialization/min_specialization/next-solver-region-resolution.rs:18:1: 20:21>`...
  --> /checkout/tests/ui/specialization/min_specialization/next-solver-region-resolution.rs:18:1
   |
LL | / impl<'a, T> Foo for &T
LL | | where
LL | |     Self::Item: Baz,
   | |____________________^
   = note: ...which again requires coherence checking all impls of trait `Foo`, completing the cycle
note: cycle used when checking that `<impl at /checkout/tests/ui/specialization/min_specialization/next-solver-region-resolution.rs:18:1: 20:21>` is well-formed
  --> /checkout/tests/ui/specialization/min_specialization/next-solver-region-resolution.rs:18:1
   |
LL | / impl<'a, T> Foo for &T
LL | | where
LL | |     Self::Item: Baz,
   | |____________________^
   = note: for more information, see <https://rustc-dev-guide.rust-lang.org/overview.html#queries> and <https://rustc-dev-guide.rust-lang.org/query.html>

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0391`.
------------------------------------------

rust-bors · 2026-07-27T02:42:21Z

☀️ Test successful - CI
Approved by: JonathanBrouwer
Duration: 3h 14m 2s
Pushing dfbea5b to main...

rust-timer · 2026-07-27T02:50:46Z

📌 Perf builds for each rolled up PR:

PR#	Message	Perf Build Sha
#159638	bootstrap: Split the `Step` trait into multiple traits	`37e3b95e26094b84927c9357e7ffbf0f0628e98f` (link)
#159774	rustc_trait_selection: fix trait solver hang caused by dege…	`a0de912ef118bca6168a48e92427d13983fa145d` (link)
#159837	line-tables-only test: check that the line number matches t…	`46a5fd287b393f08cd1d9f6eb862a8f5e5c71916` (link)
#159946	Update Enzyme submodule to imporve llvm-cov	`121bb4792ed3dbd4de349a680a1cbdbb74b7fe2b` (link)
#159962	miri subtree update	`1869eb38ebb267b2825a6a14e4e066bead2bd5ea` (link)
#156570	tests: extend remap-path-prefix-std to all stdlib rlibs	`ec49913ed46d915bcfa06bc0e1c35a4c027b6ac0` (link)
#159617	Fix up `#[linkage]` target checking	`5ba7a349426e0f7481e83bbb8ab0e90e2fb3cf30` (link)
#159633	Improve workings of attribute suggestions	`a553aac854cee9bc678bb437d8fa66208229cef7` (link)
#159733	std: Switch implementations of `thread_local!` for WASI	`5f4dae14c2de29c58eed842a40e1619f666b767f` (link)
#159783	Check unsafe impls on safe EIIs	`4fcef240ce1ac91c4f80d6169e1a7adbfc447645` (link)
#159810	Add tuple never coercion collection regression test	`3660995eb8cff7ec4fbdea42d41ad4dd638b57ac` (link)
#159826	Remove redundant `#[rustc_paren_sugar]` feature gate	`ef2c177737e73c9e872e985d7c16028100f20af2` (link)
#159846	Implement `str::copy_from_str`	`63c2703cf92a4fd1dab3ea82bc31de47cfdb9503` (link)
#159849	rustc_parse: Stop returning `Option` from statement parsing	`d1c9ad605e4b48b5eb8c51ebfd8aee166aaadac1` (link)
#159853	Updated expect messages for `CString` struct and method doc…	`f242e63daab96795f58a9033bcf1afdd36f525de` (link)
#159875	More cleanup in `rustc_attr_parsing`	`e6d70ada57446de65e31e7aca774cb3530b13ead` (link)
#159882	Update expect messages in library/alloc/boxed.rs and librar…	`f63443d5fc0ad7cf02d0c8ee3e06f09cab960d1e` (link)
#159891	Split multiline derives into std/rustc macros	`e255c72929460a188e92b346e6581eb2e7cc0d72` (link)
#159893	Fix `find_attr` hygiene and `rustc_hir` cleanups	`2b644d1db895137f749055cca1331d46adaba2d4` (link)
#159895	rustc-dev-guide subtree update	`09ce5bc7d169b13a649686b26fe164750a1a9482` (link)
#159902	Clarify that the expected runtime symbols signature is for …	`d07fea5d511f785073f3a308531c55d864549dbc` (link)
#159914	Fix error in diagnostic on_unmatched_args	`4d567a3966e728d792de7ae88b8e002f66bf9910` (link)
#159917	spare capacity mut constification	`6ccbe8eae2a1b3c11f7d49aa05f515605769d7e6` (link)
#159918	rename abort_unwind → abort_on_unwind	`438076e0be5423af4b61f649ee5d3783c2932397` (link)
#159927	Remove sve2 from the ImpliedFeatures of AArch64 v9a.	`8d063b8838c729177fc9369bfaeb51041c27615c` (link)
#159936	Minor `rustc_ast::ast` doc cleanups	`3cf7b34172d3a9e8940247e15da74221ecf66a7e` (link)
#159945	Update expect messages in library/core/src/ptr/non_null.rs	`497507b3839037c138bf532ca8ebd16545933740` (link)
#159950	Add CFI tests for return types and never type	`d3f55b10e707f58b65b6924d604e252db7f52bff` (link)

previous master: dc3f85158a

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-log-analyzer · 2026-07-27T02:55:21Z

A job failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

rust-timer · 2026-07-27T03:23:22Z

Finished benchmarking commit (dfbea5b): 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%	[0.3%, 0.3%]	6
Regressions ❌ (secondary)	0.4%	[0.2%, 0.6%]	22
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.3%	[0.3%, 0.3%]	6

Max RSS (memory usage)

Results (primary 2.1%, secondary 2.4%)

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

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

Cycles

Results (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)	2.1%	[2.1%, 2.1%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.3%	[-2.3%, -2.3%]	1
All ❌✅ (primary)	-	-	0

Binary size

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

Bootstrap: 489.277s -> 486.74s (-0.52%)
Artifact size: 387.73 MiB -> 387.74 MiB (0.00%)

moabo3li and others added 30 commits July 18, 2026 08:00

[Priroda] Render indirect locals with allocation dumps

037fbe7

Resolve allocation-backed mplace locals and display their allocation contents with dump_alloc. Keep unsupported provenance as <indirect> and update the fixtures for the temporary diagnostic allocation output.

Prepare for merging from rust-lang/rust

cc00f34

This updates the rust-version file to c904ba3.

Merge pull request rust-lang#5218 from rust-lang/rustup-2026-07-19

e69e7d2

Automatic Rustup

Merge pull request rust-lang#5217 from moabo3li/local-value-bytes-han…

9b5b406

…dling [Priroda] Render indirect local values

support neon.tbl* intrinsics

f9c7888

add a riscv target to CI

763fe4d

Merge pull request rust-lang#5219 from folkertdev/aarch64-table

2c92e6d

support `neon.tbl*` intrinsics

readme: fix misspelling of -Ctarget-feature

810cdc0

When using `RUSTFLAGS="-Ctarget-features=+avx512f"`, the Rust compiler complains: error: unknown codegen option: `target-features` The actual option uses the singular form.

bump libc

afefb4f

Merge pull request rust-lang#5221 from niooss-ledger/readme-Ctarget-f…

132caa8

…eature-typo readme: fix misspelling of `-Ctarget-feature`

Merge pull request rust-lang#5216 from RalfJung/riscv

940657f

add a riscv target to CI

Prepare for merging from rust-lang/rust

6ca5127

This updates the rust-version file to 1af98b7.

Revert "disable portable_simd miri test that needs additional intri…

94fde0c

…nsic support" This reverts commit 785e740bb5c1d9166717c93612f7b9f99fee1caf. The additional intrinsic support has meanwhile been implemented.

disable swizzle_dyn test on loongarch

cabd1f1

Merge pull request rust-lang#5224 from RalfJung/rustup

7e9fba3

Rustup

Prepare for merging from rust-lang/rust

525e1aa

This updates the rust-version file to 390279b.

[Priroda] Test projected mplace value range rendering

21b23c2

Add a CLI fixture covering a projected memory-backed field inside a larger aggregate. This locks in that projected values render only their own MPlace layout bytes instead of trailing bytes from the parent allocation.

Merge pull request rust-lang#5225 from rust-lang/rustup-2026-07-23

c9492bb

Automatic Rustup

Merge pull request rust-lang#5220 from moabo3li/handle-projected-values

a9bc5ec

[Priroda] Render projected debug-info values

Add tuple never coercion collection regression test

1bd4fa0

Check unsafe impls on safe EIIs

bae7e21

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-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jul 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 Jul 27, 2026

rust-bors Bot merged commit dfbea5b into rust-lang:main Jul 27, 2026
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rustbot added this to the 1.99.0 milestone Jul 27, 2026

rustbot added the perf-regression Performance regression. label Jul 27, 2026

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rust-timer commented Jul 27, 2026

Overall result: ❌ regressions - please read:

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JonathanBrouwer commented Jul 26, 2026 •

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