Rollup of 28 pull requests by JonathanBrouwer · Pull Request #160725 · rust-lang/rust

JonathanBrouwer · 2026-08-07T22:38:39Z

Successful merges:

Hint that memchr returns an in-bounds index #159784 (Hint that memchr returns an in-bounds index)
Improve canonical_param_env_cache #160673 (Improve canonical_param_env_cache)
Revive L4Re target #150885 (Revive L4Re target)
Add support for splatted function pointers #159643 (Add support for splatted function pointers)
delegation: add support for wrapping of the return value with From::from #160433 (delegation: add support for wrapping of the return value with From::from)
refactor handling of target features in Session #160530 (refactor handling of target features in Session)
bootstrap: Store and use an explicit CheckKind in check::Rustc #160606 (bootstrap: Store and use an explicit CheckKind in check::Rustc)
fix ICE in suggest_add_reference_to_arg for non-callable items #160628 (fix ICE in suggest_add_reference_to_arg for non-callable items)
Add regression test for unknown feaeture name reported with other errors #160683 (Add regression test for unknown feaeture name reported with other errors)
Do not promote extern statics #157641 (Do not promote extern statics)
Fix FutureDropPoll shim for by-move async closures #158904 (Fix FutureDropPoll shim for by-move async closures)
added note/help about iterator invalidation when mutating a collection inside a for loop #159816 (added note/help about iterator invalidation when mutating a collection inside a for loop)
Add regression test for GAT bound mismatched type error #160103 (Add regression test for GAT bound mismatched type error)
dlopen offload #160335 (dlopen offload)
codegen: classify localized MSVC linker progress as linker_info #160445 (codegen: classify localized MSVC linker progress as linker_info)
rustc_resolve: move diagnostic attribute linting to attr parsing #160499 (rustc_resolve: move diagnostic attribute linting to attr parsing)
cleanup borrowck, improve c-variadic handling #160504 (cleanup borrowck, improve c-variadic handling)
expand: Feature gate AST-based attribute macros on expressions and statements #160577 (expand: Feature gate AST-based attribute macros on expressions and statements)
Add regression test for associated type outlives bound at call site #160587 (Add regression test for associated type outlives bound at call site)
platform-support/netbsd.md: No longer mention 8.x, due to EoL. #160625 (platform-support/netbsd.md: No longer mention 8.x, due to EoL.)
delegation: fix determining wrong FnKind when delegation is inside const arg #160633 (delegation: fix determining wrong FnKind when delegation is inside const arg)
derive(Diagnostic): link to proper docs #160636 (derive(Diagnostic): link to proper docs)
Clean up some manual debug impls #160644 (Clean up some manual debug impls)
move naked function ui tests #160649 (move naked function ui tests)
Improve MaybeLiveLocals #160672 (Improve MaybeLiveLocals)
Add branch config for perf. unrolling in bors #160693 (Add branch config for perf. unrolling in bors)
rustc_codegen_llvm: handle sm_101* features being an alias #160696 (rustc_codegen_llvm: handle sm_101* features being an alias)
renovate: clarify that vulnerability PRs are opened automatically #160706 (renovate: clarify that vulnerability PRs are opened automatically)

Proving `T::Assoc<_>: Sized` while a where-clause bound `T::Assoc<u8>: Sized` was in scope used to over-eagerly infer the unconstrained argument to `u8`, causing a spurious "mismatched types" error. It should compile; lock that in.

Add tests for generic function pointers Change FnPtr tests to use assert_eq!() rather than println!()

It had to be in rustc_resolve because there was no general attribute parsing infra back then, but now there is, so it should be there

LLVM 21 preserves the bounds assumption but does not eliminate the aggregate phi that LLVM 22 removes. Check each version's supported optimization and restore the shared postcondition so direct callers can eliminate bounds checks.

These extra layers of indirection are more confusing than helpful.

This has the pleasant side-effect of making `./x fix compiler` actually work, without breaking `./x clippy` (which relied on the hardcoded `Kind::Check`).

Also change the pkgsrc-wip link to indicate a more current rust version. To be re-visited again once 9.x reaches end of maintnance and EoL by the end of the current month.

…from` * Add support for wrapping of the return value of delegation * Cleanups * Review: use `make_lang_item_qpath`

…n-item statements

Fixes the builds of rustc and library/std for the L4Re target OS. A major change was done in linking binaries: The need for the L4Bender tool was removed and linking parameters are now fully configured in the rustc target config.

The field of `BodyOwnerKind` is computed via the exact same way as this check.

rust-bors · 2026-08-07T22:39:06Z

📌 Commit f07399c has been approved by JonathanBrouwer

It is now in the queue for this repository.

rust-log-analyzer · 2026-08-07T23:40:59Z

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

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

46 
+ error[E0658]: macro attributes on statements are unstable
+   --> $DIR/autodiff_illegal.rs:49:5
+    |
+ LL |     #[autodiff_forward(df7, Dual)]
+    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+    |
+    = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
+    = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
+    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
+ 
47 error: autodiff must be applied to function
48   --> $DIR/autodiff_illegal.rs:50:5
49    |

50 LL |     let mut x = 5;
51    |     ^^^^^^^^^^^^^^
52 
+ error[E0658]: macro attributes on expressions are unstable
+   --> $DIR/autodiff_illegal.rs:53:5
+    |
+ LL |     #[autodiff_forward(df7, Dual)]
+    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+    |
+    = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
+    = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
+    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
+ 
53 error: autodiff must be applied to function
54   --> $DIR/autodiff_illegal.rs:54:5
55    |

56 LL |     x = x + 3;
57    |     ^
58 
+ error[E0658]: macro attributes on statements are unstable
+   --> $DIR/autodiff_illegal.rs:58:5
+    |
+ LL |     #[autodiff_forward(df7, Dual)]
+    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+    |
+    = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
+    = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
+    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
+ 
59 error: autodiff must be applied to function
60   --> $DIR/autodiff_illegal.rs:59:5
61    |

124 LL | #[autodiff_reverse(df21, Active, Duplicated)]
125    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
126 
- error: aborting due to 18 previous errors
+ error: aborting due to 21 previous errors
128 
---
-   --> /checkout/tests/ui/autodiff/autodiff_illegal.rs:58:5
+ error[E0658]: macro attributes on statements are unstable
+   --> $DIR/autodiff_illegal.rs:49:5
+    |
+ LL |     #[autodiff_forward(df7, Dual)]
+    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+    |
+    = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
+    = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
+    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
+ 
+ error[E0658]: macro attributes on expressions are unstable
+   --> $DIR/autodiff_illegal.rs:53:5
+    |
+ LL |     #[autodiff_forward(df7, Dual)]
+    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+    |
+    = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
+    = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
+    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
+ 
+ error[E0658]: macro attributes on statements are unstable
+   --> $DIR/autodiff_illegal.rs:58:5
+    |
+ LL |     #[autodiff_forward(df7, Dual)]
+    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+    |
+    = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
+    = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
+    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
+ 
+ error: aborting due to 21 previous errors


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 autodiff/autodiff_illegal.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/autodiff/autodiff_illegal.rs" "-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" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/autodiff/autodiff_illegal" "-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"
stdout: none
--- stderr -------------------------------
error[E0658]: attributes on expressions are experimental
##[error]  --> /checkout/tests/ui/autodiff/autodiff_illegal.rs:53:5
   |
LL |     #[autodiff_forward(df7, Dual)]
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
   = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error: Duplicated can not be used for this type
##[error]  --> /checkout/tests/ui/autodiff/autodiff_illegal.rs:14:14
   |
LL | pub fn f1(x: f64) {
---

error: Dual can not be used in Reverse Mode
##[error]  --> /checkout/tests/ui/autodiff/autodiff_illegal.rs:34:1
   |
LL | #[autodiff_reverse(df5, Dual)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: Duplicated can not be used in Forward Mode
##[error]  --> /checkout/tests/ui/autodiff/autodiff_illegal.rs:41:1
   |
---

error[E0658]: macro attributes on statements are unstable
##[error]  --> /checkout/tests/ui/autodiff/autodiff_illegal.rs:49:5
   |
LL |     #[autodiff_forward(df7, Dual)]
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
   = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error: autodiff must be applied to function
##[error]  --> /checkout/tests/ui/autodiff/autodiff_illegal.rs:50:5
   |
LL |     let mut x = 5;
   |     ^^^^^^^^^^^^^^

error[E0658]: macro attributes on expressions are unstable
##[error]  --> /checkout/tests/ui/autodiff/autodiff_illegal.rs:53:5
   |
LL |     #[autodiff_forward(df7, Dual)]
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
   = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error: autodiff must be applied to function
##[error]  --> /checkout/tests/ui/autodiff/autodiff_illegal.rs:54:5
   |
LL |     x = x + 3;
   |     ^

error[E0658]: macro attributes on statements are unstable
##[error]  --> /checkout/tests/ui/autodiff/autodiff_illegal.rs:58:5
   |
LL |     #[autodiff_forward(df7, Dual)]
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
   = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error: autodiff must be applied to function
##[error]  --> /checkout/tests/ui/autodiff/autodiff_illegal.rs:59:5
   |
LL |     let add_one_v2 = |x: u32| -> u32 { x + 1 };
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: autodiff requires at least a name and mode
##[error]  --> /checkout/tests/ui/autodiff/autodiff_illegal.rs:65:1
   |
---
   |
LL | fn fn_exists() {}
   | -------------- previous definition of the value `fn_exists` here
...
LL | #[autodiff_reverse(fn_exists, Active)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `fn_exists` redefined here
   |
   = note: `fn_exists` must be defined only once in the value namespace of this module

error: did not recognize Activity: `Reverse`
##[error]  --> /checkout/tests/ui/autodiff/autodiff_illegal.rs:95:26
   |
LL | #[autodiff_reverse(df13, Reverse)]
   |                          ^^^^^^^

error: invalid return activity Active in Forward Mode
##[error]  --> /checkout/tests/ui/autodiff/autodiff_illegal.rs:131:1
   |
LL | #[autodiff_forward(df19, Dual, Active)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: invalid return activity Dual in Reverse Mode
##[error]  --> /checkout/tests/ui/autodiff/autodiff_illegal.rs:137:1
   |
LL | #[autodiff_reverse(df20, Active, Dual)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: invalid return activity Duplicated in Reverse Mode
##[error]  --> /checkout/tests/ui/autodiff/autodiff_illegal.rs:144:1
   |
LL | #[autodiff_reverse(df21, Active, Duplicated)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 21 previous errors

Some errors have detailed explanations: E0428, E0658.
---
[TIMING:end] test::Ui { test_compiler: Compiler { stage: 2, host: x86_64-unknown-linux-gnu, forced_compiler: false }, target: x86_64-unknown-linux-gnu } -- 0.000

1 command(s) did not execute successfully:

  - env -u CARGO DOC_RUST_LANG_ORG_CHANNEL="https://doc.rust-lang.org/nightly" LD_LIBRARY_PATH="" RUSTC="/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc" RUSTC_BOOTSTRAP="1" RUSTC_FORCE_RUSTC_VERSION="compiletest" RUST_TEST_THREADS="4" RUST_TEST_TMPDIR="/checkout/obj/build/tmp" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage1-tools-bin/compiletest" "--stage" "2" "--stage-id" "stage2-x86_64-unknown-linux-gnu" "--compile-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib" "--run-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib" "--rustc-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "--minicore-path" "/checkout/tests/auxiliary/minicore.rs" "--src-root" "/checkout" "--src-test-suite-root" "/checkout/tests/ui" "--build-root" "/checkout/obj/build" "--build-test-suite-root" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui" "--sysroot-base" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--suite" "ui" "--mode" "ui" "--target" "x86_64-unknown-linux-gnu" "--host" "x86_64-unknown-linux-gnu" "--llvm-filecheck" "/checkout/obj/build/x86_64-unknown-linux-gnu/llvm/build/bin/FileCheck" "--default-codegen-backend" "llvm" "--has-enzyme" "--optimize-tests" "--host-rustcflags" "-Crpath" "--host-rustcflags" "-Cdebuginfo=0" "--host-rustcflags" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--target-rustcflags" "-Crpath" "--target-rustcflags" "-Cdebuginfo=0" "--target-rustcflags" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--python" "/usr/bin/python3" "autodiff" "feature-gates/feature-gate-autodiff.rs" "--verbose-run-make-subprocess-output" "--with-rustc-debug-assertions" "--with-std-debug-assertions" "--jobs" "4" "--llvm-version" "23.1.0-rust-1.99.0-nightly" "--llvm-components" "aarch64 aarch64asmparser aarch64codegen aarch64desc aarch64disassembler aarch64info aarch64utils abi aggressiveinstcombine all all-targets amdgpu amdgpuasmparser amdgpucodegen amdgpudesc amdgpudisassembler amdgpuinfo amdgputargetmca amdgpuutils analysis arm armasmparser armcodegen armdesc armdisassembler arminfo armutils asmparser asmprinter avr avrasmparser avrcodegen avrdesc avrdisassembler avrinfo binaryformat bitreader bitstreamreader bitwriter bpf bpfasmparser bpfcodegen bpfdesc bpfdisassembler bpfinfo cas cfguard cgdata codegen codegentypes core coroutines coverage csky cskyasmparser cskycodegen cskydesc cskydisassembler cskyinfo debuginfobtf debuginfocodeview debuginfodwarf debuginfodwarflowlevel debuginfogsym debuginfologicalview debuginfomsf debuginfopdb demangle dlltooldriver dtlto dwarfcfichecker dwarflinker dwarflinkerclassic dwarflinkerparallel dwp engine executionengine extensions filecheck frontendatomic frontenddirective frontenddriver frontendhlsl frontendoffloading frontendopenacc frontendopenmp fuzzercli fuzzmutate globalisel hexagon hexagonasmparser hexagoncodegen hexagondesc hexagondisassembler hexagoninfo hipstdpar instcombine instrumentation interfacestub interpreter ipo irprinter irreader jitlink libdriver lineeditor linker loongarch loongarchasmparser loongarchcodegen loongarchdesc loongarchdisassembler loongarchinfo lto m68k m68kasmparser m68kcodegen m68kdesc m68kdisassembler m68kinfo mc mca mcdisassembler mcjit mcparser mips mipsasmparser mipscodegen mipsdesc mipsdisassembler mipsinfo mirparser msp430 msp430asmparser msp430codegen msp430desc msp430disassembler msp430info native nativecodegen nvptx nvptxcodegen nvptxdesc nvptxinfo objcarcopts objcopy object objectyaml option orcdebugging orcjit orcshared orctargetprocess passes plugins powerpc powerpcasmparser powerpccodegen powerpcdesc powerpcdisassembler powerpcinfo profiledata remarks riscv riscvasmparser riscvcodegen riscvdesc riscvdisassembler riscvinfo riscvtargetmca runtimedyld sandboxir scalaropts selectiondag sparc sparcasmparser sparccodegen sparcdesc sparcdisassembler sparcinfo support supportlsp symbolize systemz systemzasmparser systemzcodegen systemzdesc systemzdisassembler systemzinfo tablegen target targetparser telemetry textapi textapibinaryreader transformutils vectorize webassembly webassemblyasmparser webassemblycodegen webassemblydesc webassemblydisassembler webassemblyinfo webassemblyutils windowsdriver windowsmanifest x86 x86asmparser x86codegen x86desc x86disassembler x86info x86targetmca xray xtensa xtensaasmparser xtensacodegen xtensadesc xtensadisassembler xtensainfo" "--cc" "" "--cxx" "" "--cflags" "" "--cxxflags" "" "--channel" "nightly" "--git-hash" "--nightly-branch" "main" "--git-merge-commit-email" "bors@rust-lang.org" (failure_mode=Exit)
Bootstrap failed while executing `test --stage 2 --no-fail-fast tests/codegen-llvm/autodiff tests/pretty/autodiff tests/ui/autodiff tests/ui/feature-gates/feature-gate-autodiff.rs`
Currently active steps:
Build completed unsuccessfully in 0:54:02
  local time: Fri Aug  7 23:40:08 UTC 2026
  network time: Fri, 07 Aug 2026 23:40:08 GMT

Important

For more information how to resolve CI failures of this job, visit this link.

rust-bors · 2026-08-08T01:43:58Z

☀️ Test successful - CI
Approved by: JonathanBrouwer
Duration: 3h 2m 24s
Pushing 7dfb9d0 to main...

rust-timer · 2026-08-08T01:52:17Z

📌 Perf builds for each rolled up PR:

PR#	Message	Perf Build Sha
#159784	Hint that memchr returns an in-bounds index	`3312085feeef8998d897700270cf4daf7c28f042` (link)
#160673	Improve `canonical_param_env_cache`	`4f8ceb322a8d7fdc7af572268eb53ae7fc2ee213` (link)
#150885	Revive L4Re target	`e6e28663c1db2a483f033791ef5afbfeb9207b36` (link)
#159643	Add support for splatted function pointers	`360f68d890d85df75cab2ee4f9632fb76067e4c5` (link)
#160433	delegation: add support for wrapping of the return value wi…	`d4e7e466dcc80b3098e2cc32077948a04939c263` (link)
#160530	refactor handling of target features in Session	`8b41c31ef6fcc1e3e67da6fdc394a53989d1d1ae` (link)
#160606	bootstrap: Store and use an explicit CheckKind in `check::R…	`d13d13d15b07dc0899fc66b14e0d16992d7fb4b5` (link)
#160628	fix ICE in `suggest_add_reference_to_arg` for non-callable …	`d87fea77412aac40994be1be3d9d40e1419b1158` (link)
#160683	Add regression test for unknown feaeture name reported with…	`3163af4839c756642c172e19dd1841aa51aad54b` (link)
#157641	Do not promote extern statics	`30489c88c8f01dbde2b09c709655fd08d3d8c06e` (link)
#158904	Fix FutureDropPoll shim for by-move async closures	`db225d7bee08bab3fdf098b486dffad9f46956f6` (link)
#159816	added note/help about iterator invalidation when mutating a…	`5c50c64473b6407e1b21b147b769a952bbafd9c8` (link)
#160103	Add regression test for GAT bound mismatched type error	`eb2d6ddfdf0ab4433be6c8edfa2afa2cc0b3417e` (link)
#160335	dlopen offload	`d0959f0f7c0452c5568aac35912821b23462e08a` (link)
#160445	codegen: classify localized MSVC linker progress as linker_…	`e0fc892ba4fd5e32a578863f56e78a921228277b` (link)
#160499	rustc_resolve: move diagnostic attribute linting to attr pa…	`2f737a2474634e238bd492d4d8f821ded99ac0e6` (link)
#160504	cleanup borrowck, improve c-variadic handling	`326ddb57ad0d82111aa0af9f0c6f25532c8ec539` (link)
#160577	expand: Feature gate AST-based attribute macros on expressi…	`c01ea0b98d2006a20bf5e2a0bdbd3c1a3bb0a6ca` (link)
#160587	Add regression test for associated type outlives bound at c…	`eb88ef15ff042672b9d1bb4744d1c3766050e32c` (link)
#160625	platform-support/netbsd.md: No longer mention 8.x, due to E…	`1f1d9b3ddb1d7a8561b296e75f09a6d64c74a5f4` (link)
#160633	delegation: fix determining wrong `FnKind` when delegation …	`c65db8b7ecdc41e094a035897f51d51aa3612d9b` (link)
#160636	derive(Diagnostic): link to proper docs	`9162df1fd6cf50e25cd3f99d3ecd0f316343eb36` (link)
#160644	Clean up some manual debug impls	`fd41a86a8c35f107884f7e4cbe52bb809a2d2a3e` (link)
#160649	move naked function ui tests	`d3707ec7f26d13ebb52470ef13bb88132042c0a4` (link)
#160672	Improve `MaybeLiveLocals`	`bdb729fd9c4e2a525a47ad93e2bb9688ef15cd72` (link)
#160693	Add branch config for perf. unrolling in bors	`d68a8a0c2dd741d7661f492381f785327c436ac7` (link)
#160696	rustc_codegen_llvm: handle sm_101* features being an alias	`65b3a276ae8afdb35924a1dceecae79ab1a5f27a` (link)
#160706	renovate: clarify that vulnerability PRs are opened automat…	`0cdf3fc1af13b0a15b02bc8c5751014a3cea64bd` (link)

previous master: 1a98b1e135

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 · 2026-08-08T01:56:49Z

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rust-timer · 2026-08-08T02:28:05Z

Finished benchmarking commit (7dfb9d0): 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
Regressions ❌ (secondary)	0.7%	[0.5%, 0.9%]	2
Improvements ✅ (primary)	-0.4%	[-0.5%, -0.3%]	2
Improvements ✅ (secondary)	-0.3%	[-0.3%, -0.2%]	3
All ❌✅ (primary)	-0.4%	[-0.5%, -0.3%]	2

Max RSS (memory usage)

Results (primary 1.4%, 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)	1.4%	[1.4%, 1.4%]	1
Regressions ❌ (secondary)	3.5%	[0.4%, 11.7%]	11
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.1%	[-5.2%, -0.5%]	11
All ❌✅ (primary)	1.4%	[1.4%, 1.4%]	1

Cycles

Results (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)	-	-	0
Regressions ❌ (secondary)	0.9%	[0.4%, 1.4%]	10
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-1.0%	[-1.9%, -0.4%]	6
All ❌✅ (primary)	-	-	0

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%, 0.1%]	7
Regressions ❌ (secondary)	0.0%	[0.0%, 0.1%]	5
Improvements ✅ (primary)	-0.0%	[-0.1%, -0.0%]	5
Improvements ✅ (secondary)	-0.0%	[-0.1%, -0.0%]	3
All ❌✅ (primary)	0.0%	[-0.1%, 0.1%]	12

Bootstrap: 458.124s -> 458.758s (0.14%)
Artifact size: 398.66 MiB -> 398.65 MiB (-0.00%)

sjwang05 and others added 30 commits June 12, 2026 22:03

reject extern statics in promotion

36e4fe5

re-bless tests

9ac2606

Hint that memchr returns an in-bounds index

0439f4e

Hint that memrchr returns an in-bounds index

c1f36d5

Cover memchr fast path with bounds assertion

844c01e

Fix memchr result CI checks

49c1f02

Preserve memchr codegen on LLVM 21

807750a

Inline the splatted_callee function

1e1aad2

Refactor splat using custom enums (with stubs)

9f9fb37

Make splatted FnPtr calls work (rather than ICE)

f88563c

Add tests for generic function pointers Change FnPtr tests to use assert_eq!() rather than println!()

make DefiningTy independent of borrowck

9ff75a7

Add regression test for associated type outlives bound at call site

8427cb5

rustc_resolve: move diagnostic attribute linting to attr parsing

cd19505

It had to be in rustc_resolve because there was no general attribute parsing infra back then, but now there is, so it should be there

Handle LLVM 21 in memchr result codegen test

cd8a97b

LLVM 21 preserves the bounds assumption but does not eliminate the aggregate phi that LLVM 22 removes. Check each version's supported optimization and restore the shared postcondition so direct callers can eliminate bounds checks.

Snapshot test for ./x fix compiler

6ea57af

Inline and remove constructors from check::Rustc

938bf98

These extra layers of indirection are more confusing than helpful.

Store and use an explicit CheckKind in check::Rustc

b344260

This has the pleasant side-effect of making `./x fix compiler` actually work, without breaking `./x clippy` (which relied on the hardcoded `Kind::Check`).

Add documentation and maintainer for L4Re target

fd7e845

Add aarch64 architecture for L4Re target

5bb8d31

platform-support/netbsd.md: No longer mention 8.x, due to EoL.

225ca5f

Also change the pkgsrc-wip link to indicate a more current rust version. To be re-visited again once 9.x reaches end of maintnance and EoL by the end of the current month.

fix ICE in suggest_add_reference_to_arg for non-callable items

0d75b8c

delegation: add support for wrapping of the return value with `From::…

140d4cb

…from` * Add support for wrapping of the return value of delegation * Cleanups * Review: use `make_lang_item_qpath`

expand: Feature gate AST-based attribute macros on expressions and no…

86b915f

…n-item statements

L4Re: Repair build and move to rustc linking

f2dd932

Fixes the builds of rustc and library/std for the L4Re target OS. A major change was done in linking binaries: The need for the L4Bender tool was removed and linking parameters are now fully configured in the rustc target config.

expand: Change feature gate wording for feature(proc_macro_hygiene)

f639348

cleanup DefiningTy::new

c1af195

The field of `BodyOwnerKind` is computed via the exact same way as this check.

make the c_variadic region late bound

b326732

Fix determining wrong fn kind when delegation is inside const arg

234a308

refactor handling of target features in Session

8bb9f27

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 Aug 7, 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 Aug 8, 2026

rust-bors Bot merged commit 7dfb9d0 into rust-lang:main Aug 8, 2026
14 checks passed

rustbot added this to the 1.99.0 milestone Aug 8, 2026

rustbot added the perf-regression Performance regression. label Aug 8, 2026

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Rollup of 28 pull requests - #160725

Rollup of 28 pull requests#160725
rust-bors[bot] merged 85 commits into
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Overall result: ❌✅ regressions and improvements - please read:

Instruction count

Max RSS (memory usage)

Cycles

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