Rollup of 11 pull requests by JonathanBrouwer · Pull Request #162028 · rust-lang/rust

JonathanBrouwer · 2026-08-30T19:48:09Z

Successful merges:

Handle multiple action records in EH personality function #160923 (Handle multiple action records in EH personality function)
Check to ensure we're running against the correct LLVM version #161788 (Check to ensure we're running against the correct LLVM version)
Always escape grapheme extenders in str::escape_debug #158303 (Always escape grapheme extenders in str::escape_debug)
bootstrap: Flatten and rename compute_src_directory_via_git #161644 (bootstrap: Flatten and rename compute_src_directory_via_git)
Use drop_guard in some places in {core,alloc,std} #161702 (Use drop_guard in some places in {core,alloc,std})
Add config for gram editor to .gitignore #161713 (Add config for gram editor to .gitignore)
Fix and improve diagnostics for lint rust_2021_prefixes_incompatible_syntax #161792 (Fix and improve diagnostics for lint rust_2021_prefixes_incompatible_syntax)
Revert "Add rustc_test_entrypoint_marker" #161931 (Revert "Add rustc_test_entrypoint_marker")
touch up "get attribute" docs. #162015 (touch up "get attribute" docs.)
remove a couple of redundant clones, thanks clippy #162019 (remove a couple of redundant clones, thanks clippy)
Remove redundant braces from NonZero doctests #162023 (Remove redundant braces from NonZero doctests)

This matches the behavior of `impl Debug for str`.

…rules!` macro

Handle multiple action records in EH personality function LSDA encodes actions are a linked list, we currently only decode the first one. Action records are used for catching specific exception types and for exception specifications, and none of these are present in Rust. However we can still have of multiple of them being present due to LLVM inlining. When this happens, "Catch" is the correct action to execute. We haven't had issues with this because LLVM orders cleanup record last; however GCC doesn't use the same order, so we do need to explicitly handle this case to support both LLVM and GCC codegen. See https://rust-lang.zulipchat.com/#narrow/channel/182449-t-compiler.2Fhelp/topic/Possible.20bug.20in.20unwind.20function.20in.20std/with/615883393

Check to ensure we're running against the correct LLVM version The recent LLVM version bump exposed several cases of mishandling LLVM versions, both in-tree and downstream (rust-lang#161335, rust-lang#161377, rust-lang#161572, rust-lang#162013, https://rust-lang.zulipchat.com/#narrow/channel/122651-general/topic/opt-dist.20pipeline.20failure.20in.20MSYS2.20CI.20when.20compiling.2E.2E.2E/with/619077952). If the compiler is run against an incompatible LLVM version, the most common failure mode is a segfault within LLVM, often when looking up target information. This is not obvious to debug, so this PR adds an LLVM version check before initializing LLVM so that we can produce a clearer error. The second commit in this PR performs a `dladdr` lookup to print the path to the LLVM we're using. We already have code to do this for finding the sysroot, which I repurposed. However, I don't mind reverting this if it's too complex/risky. I would appreciate if someone with permissions could trigger a try build on AIX, Windows, and WASI as the second commit touches platform-specific code that I can't test locally. Before: ``` error: rustc interrupted by SIGSEGV, printing backtrace 0 librustc_driver-18049a207bb38ba8.dy 0x000000010e09e9b8 _RNvNtCsfNrGi27GPxl_17rustc_driver_impl14signal_handler17print_stack_trace + 140 1 libsystem_platform.dylib 0x0000000184c7d744 _sigtramp + 56 2 libLLVM.dylib 0x000000011a9e22e0 _ZNK4llvm15MCSubtargetInfo13checkFeaturesENS_9StringRefE + 40 3 librustc_driver-18049a207bb38ba8.dy 0x000000010e44c798 LLVMRustHasFeature + 104 4 librustc_driver-18049a207bb38ba8.dy 0x000000010e3c4e34 _RINvXs0_NtNtNtCsk8HLZXaYIk4_4core4iter8adapters3mapINtB6_3MapINtNtB8_7flatten7FlatMapINtNtB8_6filter6FilterINtNtNtBc_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB28_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB4G_s_0E0EIBO_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB28_ENCNCB3h_s_00ENCB3h_s_0ENCINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB7v_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtBa_6traits7collect6ExtendB8e_E6extendBX_E0ENtNtB9I_8iterator8Iterator4folduNCINvNvBar_8for_each4callTB8e_uENCINvXs1i_NtB7x_3mapINtBbD_7HashMapB8e_uB8V_EIB9E_Bbm_E6extendBN_E0E0EB4K_ + 880 5 librustc_driver-18049a207bb38ba8.dy 0x000000010e2ad884 _RINvXs1i_NtCsdLs5ZkLaCXa_9hashbrown3mapINtB7_7HashMapNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymboluNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendTBP_uEE6extendINtNtNtB2m_8adapters3map3MapINtNtB3r_7flatten7FlatMapINtNtB3r_6filter6FilterINtNtNtB2o_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB52_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7A_s_0E0EIB3n_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB52_ENCNCB6b_s_00ENCB6b_s_0ENCINvXs8_NtB9_3setINtBaq_7HashSetBP_B1x_EIB2g_BP_E6extendB3O_E0EEB7E_ + 344 6 librustc_driver-18049a207bb38ba8.dy 0x000000010e2b1ec4 _RINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB6_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendBO_E6extendINtNtNtB2k_8adapters7flatten7FlatMapINtNtB3m_6filter6FilterINtNtNtB2m_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB4G_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7e_s_0E0EINtNtB3m_3map3MapINtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB4G_ENCNCB5P_s_00ENCB5P_s_0EEB7i_ + 68 7 librustc_driver-18049a207bb38ba8.dy 0x000000010e2bfa90 _RINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB1o_s_0EB1s_ + 148 8 librustc_driver-18049a207bb38ba8.dy 0x000000010e2fb918 _RNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config + 68 9 librustc_driver-18049a207bb38ba8.dy 0x000000010e292fb0 _RNvNtCs6x0lOIkloew_15rustc_interface4util17add_configuration + 48 10 librustc_driver-18049a207bb38ba8.dy 0x000000010e06b204 _RINvMs_Csfkr8sXZt4uY_10scoped_tlsINtB5_9ScopedKeyNtCsSGoTcZpb2F_10rustc_span14SessionGlobalsE3setNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1G_31run_in_thread_pool_with_globalsNCINvNtB1I_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000uEB44_ + 1112 11 librustc_driver-18049a207bb38ba8.dy 0x000000010e090914 _RINvCsSGoTcZpb2F_10rustc_span27create_session_globals_thenuNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB14_31run_in_thread_pool_with_globalsNCINvNtB16_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000EB3s_ + 168 12 librustc_driver-18049a207bb38ba8.dy 0x000000010e07823c _RINvNtNtCs99cPMl0y5Ob_3std3sys9backtrace28___rust_begin_short_backtraceNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1e_31run_in_thread_pool_with_globalsNCINvNtB1g_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEB3C_ + 112 13 librustc_driver-18049a207bb38ba8.dy 0x000000010e04efa4 _RNSNvYNCINvNtNtCs99cPMl0y5Ob_3std6thread9lifecycle15spawn_uncheckedNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1a_31run_in_thread_pool_with_globalsNCINvNtB1c_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEs_0INtNtNtCsk8HLZXaYIk4_4core3ops8function6FnOnceuE9call_once6vtableB3y_ + 208 14 librustc_driver-18049a207bb38ba8.dy 0x0000000111697118 _RNvNvMs0_NtNtNtCs99cPMl0y5Ob_3std3sys6thread4unixNtB7_6Thread3new12thread_start + 392 15 libsystem_pthread.dylib 0x0000000184c73c58 _pthread_start + 136 16 libsystem_pthread.dylib 0x0000000184c6ec1c thread_start + 8 note: we would appreciate a report at https://github.com/rust-lang/rust help: you can increase rustc's stack size by setting RUST_MIN_STACK=33554432 ``` After: ``` thread 'rustc' (3568488) panicked at compiler/rustc_codegen_llvm/src/llvm_util.rs:59:13: LLVM version mismatch: this compiler was built for LLVM 23, but LLVM 22.1.8 was found at /Users/keljonathan/code/rust/build/aarch64-apple-darwin/stage0/lib/libLLVM.dylib stack backtrace: 0: __rustc::rust_begin_unwind at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/panicking.rs:679:5 1: core::panicking::panic_fmt at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/core/src/panicking.rs:80:14 2: configure_llvm at ./compiler/rustc_codegen_llvm/src/llvm_util.rs:59:13 3: {closure#0} at ./compiler/rustc_codegen_llvm/src/llvm_util.rs:35:13 4: {closure#0}<rustc_codegen_llvm::llvm_util::init::{closure_env#0}> at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:166:41 5: <std::sys::sync::once::queue::Once>::call at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sys/sync/once/queue.rs:225:21 6: call_once<rustc_codegen_llvm::llvm_util::init::{closure_env#0}> at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:166:20 7: init at ./compiler/rustc_codegen_llvm/src/llvm_util.rs:34:14 8: init at ./compiler/rustc_codegen_llvm/src/lib.rs:223:9 9: {closure#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}> at ./compiler/rustc_interface/src/interface.rs:440:29 10: {closure#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()> at ./compiler/rustc_interface/src/util.rs:223:17 11: {closure#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()> at ./compiler/rustc_interface/src/util.rs:180:24 12: set<rustc_span::SessionGlobals, rustc_interface::util::run_in_thread_with_globals::{closure#0}::{closure#0}::{closure_env#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()>, ()> at /Users/keljonathan/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/scoped-tls-1.0.1/src/lib.rs:137:9 13: create_session_globals_then<(), rustc_interface::util::run_in_thread_with_globals::{closure#0}::{closure#0}::{closure_env#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()>> at ./compiler/rustc_span/src/lib.rs:156:21 14: {closure#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#2}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()> at ./compiler/rustc_interface/src/util.rs:176:17 note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace. error: the compiler unexpectedly panicked. This is a bug note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md note: please make sure that you have updated to the latest nightly note: please attach the file at `/Users/keljonathan/code/rust/rustc-ice-2026-08-25T22_23_11-1423.txt` to your bug report note: rustc 1.100.0-dev running on aarch64-apple-darwin note: compiler flags: -C rpath -C debuginfo=0 -Z unstable-options query stack during panic: end of query stack ```

@rustbot

…tender, r=Mark-Simulacrum Always escape grapheme extenders in `str::escape_debug` This matches the behavior of `impl Debug for str`. @rustbot label A-Unicode T-libs-api needs-fcp

bootstrap: Flatten and rename `compute_src_directory_via_git` A small cleanup that I noticed while poking around the early parts of bootstrap. The second commit (`cfg!(test)`) is another unrelated cleanup that I happened to notice nearby. --- Because of indentation changes, viewing with “hide whitespace” is recommended. There should be no change to bootstrap behaviour.

…they Use `drop_guard` in some places in {core,alloc,std} - Tracking issue: rust-lang#144426 - Will conflict with rust-lang#161520 - rust-lang#161550 would also be cool occasionally Didn't touch the places where manual `impl Drop`s had `#[inline]` on their `fn drop` or where the guard type had other `impl`s beside `Drop` and/or was named a lot. No LLMs used, only pure human slop.

…mulacrum Add config for gram editor to .gitignore Gram is fork of Zed to remove AI branding/features: https://codeberg.org/GramEditor/gram Initially was going to propose adding it to the editor list since it just copies Zed config to another filename, but since in the past we've been resistant to adding configs for editors which aren't widespread-used, I instead just added it to .gitignore. --- LLM disclosure: Do not use, per personal policy. [ltdk.xyz/slop](https://ltdk.xyz/slop)

…diags, r=mejrs Fix and improve diagnostics for lint `rust_2021_prefixes_incompatible_syntax` On main, when encountering token sequences in Rust <2021 that would get interpreted as... 1. ...C string literals in Rust >=2021, 1. we report "*prefix `c` is unknown*" / "*prefix `cr` is unknown*" despite them obviously being known 2. we claim that they "*[are] a hard error in Rust 2021*" 2. ...raw lifetimes in Rust >=2021 like `'r#a`, we suggest splitting them *after* the hash (so `'r#` and `a`) which obviously doesn't fix the issue; they need to be split *before* the hash (so `'r` and `#a`) 3. ...unknown (reserved) prefixes in Rust >=2021, we report "*prefix […] is unknown*" but to be pedantic the sequence is *not* a prefix in the current edition, it's just a normal identifier; to be correct & precise we should thus say that they *will* be parsed as a prefix (in Rust >=2021) Lastly, unify / streamline all diagnostics pertaining to "reserved prefixes" (identifier/literal prefixes, hash prefixes (aka guarded string prefixes / multihashes)) --- Best reviewed commit by commit. > [!NOTE] > **Unblocks** PR rust-lang#161775. <sub>(No LLM was or will be used by me during the entire creation process of this PR)</sub>

@Nadrieril

…point, r=mejrs Revert "Add rustc_test_entrypoint_marker" Reverts rust-lang#158854 because it caused two beta regressions Revert required some minor solving of conflicts We can think about re-landing it after Fixes rust-lang#161920 Fixes rust-lang#161917 cc: @Nadrieril @N1ark @aDotInTheVoid @jdonszelmann

touch up "get attribute" docs.

…Brouwer remove a couple of redundant clones, thanks clippy

…r=mejrs Remove redundant braces from `NonZero` doctests This appears to be an oversight during the removal of `mem::size_of` from `use core::{mem::size_of, num::NonZero};`.

JonathanBrouwer · 2026-08-30T19:49:16Z

@bors r+ p=5

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

rust-bors · 2026-08-30T19:49:19Z

📌 Commit 5c8197f has been approved by JonathanBrouwer

It is now in the queue for this repository.

rust-bors · 2026-08-30T19:49:25Z

⌛ Trying commit 5c8197f with merge c95574f…

To cancel the try build, run the command @bors try cancel.

Workflow: https://github.com/rust-lang/rust/actions/runs/33331933831

Rollup of 11 pull requests try-job: dist-various-1 try-job: test-various try-job: x86_64-gnu-aux try-job: x86_64-gnu-llvm-21-3 try-job: x86_64-msvc-1 try-job: aarch64-apple-1 try-job: aarch64-apple-2 try-job: x86_64-mingw-1 try-job: i686-msvc-1 try-job: i686-msvc-2

…uwer Rollup of 11 pull requests Successful merges: - #160923 (Handle multiple action records in EH personality function) - #161788 (Check to ensure we're running against the correct LLVM version) - #158303 (Always escape grapheme extenders in `str::escape_debug`) - #161644 (bootstrap: Flatten and rename `compute_src_directory_via_git`) - #161702 (Use `drop_guard` in some places in {core,alloc,std}) - #161713 (Add config for gram editor to .gitignore) - #161792 (Fix and improve diagnostics for lint `rust_2021_prefixes_incompatible_syntax`) - #161931 (Revert "Add rustc_test_entrypoint_marker") - #162015 (touch up "get attribute" docs.) - #162019 (remove a couple of redundant clones, thanks clippy) - #162023 (Remove redundant braces from `NonZero` doctests)

rust-log-analyzer · 2026-08-30T20:45:41Z

The job x86_64-msvc-ext1 failed! Check out the build log: (web) (plain enhanced) (plain)

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

Caused by:
  unable to update registry `crates-io`

Caused by:
  download of ti/kv/tikv-jemalloc-sys failed

Caused by:
  [6] Could not resolve hostname (Could not resolve host: index.crates.io)
Bootstrap failed while executing `--stage 2 test src/tools/cargotest src/tools/cargo`
Currently active steps:

rust-bors · 2026-08-30T20:46:09Z

💔 Test for 135a262 failed: CI. Failed job:

auto - x86_64-msvc-ext1 (web logs, enhanced plaintext logs)

JonathanBrouwer · 2026-08-30T20:48:35Z

@bors retry

rust-bors · 2026-08-30T20:49:09Z

⌛ Testing commit 5c8197f with merge 4b7e3a7...

Workflow: https://github.com/rust-lang/rust/actions/runs/33334702806

…uwer Rollup of 11 pull requests Successful merges: - #160923 (Handle multiple action records in EH personality function) - #161788 (Check to ensure we're running against the correct LLVM version) - #158303 (Always escape grapheme extenders in `str::escape_debug`) - #161644 (bootstrap: Flatten and rename `compute_src_directory_via_git`) - #161702 (Use `drop_guard` in some places in {core,alloc,std}) - #161713 (Add config for gram editor to .gitignore) - #161792 (Fix and improve diagnostics for lint `rust_2021_prefixes_incompatible_syntax`) - #161931 (Revert "Add rustc_test_entrypoint_marker") - #162015 (touch up "get attribute" docs.) - #162019 (remove a couple of redundant clones, thanks clippy) - #162023 (Remove redundant braces from `NonZero` doctests)

Jules-Bertholet and others added 29 commits August 18, 2026 11:25

Escape grapheme extenders in str::escape_debug

66594ec

This matches the behavior of `impl Debug for str`.

Flatten and rename compute_src_directory_via_git

9c8eb44

Replace another #[cfg(test)] with if cfg!(test)

7faee83

Add gram config to gitignore

de13fc7

Check to ensure we're running against the correct LLVM version

dbea269

Look up and print path to wrong LLVM version

5841e10

Add test cases that demonstrate incorrect diagnostics

74ddcf2

Add regression test for "use of an internal attribute"

3ff3976

Add regression test for "expected item after attributes"

ca095da

Handle multiple action records in EH personality function

bf56fa4

Use drop_guard in some places in {core,alloc,std}

4f404c1

touch up "get attribute" docs.

7b159d5

remove a couple of redundant clones, thanks clippy

9b62f13

Remove redundant braces from NonZero doctests

7ea63cc

Add regression test for "use of an internal attribute" with a `macro_…

58f825e

…rules!` macro

Revert "Add rustc_test_entrypoint_marker"

9b70ab0

Unify and improve lint diagnostics for reserved prefixes

08f3b0e

Fix the suggestion span used for splitting raw lifetimes apart

3fca755

Rollup merge of rust-lang#158303 - Jules-Bertholet:escape-grapheme-ex…

d378685

…tender, r=Mark-Simulacrum Always escape grapheme extenders in `str::escape_debug` This matches the behavior of `impl Debug for str`. @rustbot label A-Unicode T-libs-api needs-fcp

Rollup merge of rust-lang#162015 - mejrs:hasattr-docs, r=JonathanBrouwer

ef26d83

touch up "get attribute" docs.

Rollup merge of rust-lang#162019 - matthiaskrgr:rm_clones, r=Jonathan…

aeb12e1

…Brouwer remove a couple of redundant clones, thanks clippy

Rollup merge of rust-lang#162023 - sorairolake:fix-nonzero-doctests, …

5c8197f

…r=mejrs Remove redundant braces from `NonZero` doctests This appears to be an oversight during the removal of `mem::size_of` from `use core::{mem::size_of, num::NonZero};`.

rust-bors Bot added the rollup A PR which is a rollup label Aug 30, 2026

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rust-bors Bot mentioned this pull request Aug 30, 2026

Add intrinsics for integer minimum and maximum #161081

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Rollup of 11 pull requests - #162028

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rust-bors Bot commented Aug 30, 2026 •

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