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staticlib with lto=fat now includes compiler_builtins as llvm bitcode after rustup update

A-linkageArea: linking into static, shared libraries and binaries Area: linking into static, shared libraries and binaries

A-LTOArea: Link-time optimization (LTO) Area: Link-time optimization (LTO)

C-bugCategory: This is a bug. Category: This is a bug.

P-criticalCritical priority Critical priority

regression-from-stable-to-nightlyPerformance or correctness regression from stable to nightly. Performance or correctness regression from stable to nightly.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue. Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#146145 In rust-lang/rust;

· behdad opened on Sep 3, 2025

Global <code>-Ctarget-feature</code> flags not applied to entry function

A-target-featureArea: Enabling/disabling target features like AVX, Neon, etc. Area: Enabling/disabling target features like AVX, Neon, etc.

C-bugCategory: This is a bug. Category: This is a bug.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue. Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#146143 In rust-lang/rust;

· heiher opened on Sep 3, 2025

Introduction of frontmatter was a theoretical breaking change (via <code>Literal::from_str</code>)

A-proc-macrosArea: Procedural macros Area: Procedural macros

C-bugCategory: This is a bug. Category: This is a bug.

F-frontmatter`#![feature(frontmatter)]` `#![feature(frontmatter)]`

I-prioritizeIssue: Indicates that prioritization has been requested for this issue. Issue: Indicates that prioritization has been requested for this issue.

regression-from-stable-to-stablePerformance or correctness regression from one stable version to another. Performance or correctness regression from one stable version to another.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue. Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#146132 In rust-lang/rust;

· fmease opened on Sep 2, 2025

Frontmatter inside <code>--cfg</code> and <code>--check-cfg</code> is not feature-gated

A-CLIArea: Command-line interface (CLI) to the compiler Area: Command-line interface (CLI) to the compiler

C-bugCategory: This is a bug. Category: This is a bug.

F-frontmatter`#![feature(frontmatter)]` `#![feature(frontmatter)]`

P-mediumMedium priority Medium priority

regression-from-stable-to-stablePerformance or correctness regression from one stable version to another. Performance or correctness regression from one stable version to another.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue. Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#146130 In rust-lang/rust;

· fmease opened on Sep 2, 2025

Exact searches with path are only exact for the last element

A-rustdoc-searchArea: Rustdoc's search feature Area: Rustdoc's search feature

C-bugCategory: This is a bug. Category: This is a bug.

T-rustdocRelevant to the rustdoc team, which will review and decide on the PR/issue. Relevant to the rustdoc team, which will review and decide on the PR/issue.

T-rustdoc-frontendRelevant to the rustdoc-frontend team, which will review and decide on the web UI/UX output. Relevant to the rustdoc-frontend team, which will review and decide on the web UI/UX output.

Status: Open.

#146129 In rust-lang/rust;

· lolbinarycat opened on Sep 2, 2025

Parsing issues around qualifiers and modifiers

A-parserArea: The lexing & parsing of Rust source code to an AST Area: The lexing & parsing of Rust source code to an AST

C-bugCategory: This is a bug. Category: This is a bug.

F-const_trait_impl`#![feature(const_trait_impl)]` `#![feature(const_trait_impl)]`

PG-const-traitsProject group: Const traits Project group: Const traits

requires-nightlyThis issue requires a nightly compiler in some way. This issue requires a nightly compiler in some way.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue. Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#146122 In rust-lang/rust;

· fmease opened on Sep 2, 2025

<code>format_args!()</code> interacts strangely with <code>$crate</code>

A-fmtArea: `core::fmt` Area: `core::fmt`

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..) Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

C-bugCategory: This is a bug. Category: This is a bug.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue. Relevant to the compiler team, which will review and decide on the PR/issue.

T-langRelevant to the language team Relevant to the language team

T-libs-apiRelevant to the library API team, which will review and decide on the PR/issue. Relevant to the library API team, which will review and decide on the PR/issue.

Status: Open.

#146114 In rust-lang/rust;

· theemathas opened on Sep 2, 2025

A <code>&amp;mut</code> in a const in a referenced literal doesn't get const-promoted

A-constant-promotionArea: constant promotion Area: constant promotion

A-ZSTArea: Zero-sized types (ZSTs). Area: Zero-sized types (ZSTs).

C-bugCategory: This is a bug. Category: This is a bug.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue. Relevant to the compiler team, which will review and decide on the PR/issue.

T-langRelevant to the language team Relevant to the language team

Status: Open.

#146108 In rust-lang/rust;

· theemathas opened on Sep 2, 2025

regression with LTO + musl + build-std

-Zbuild-stdUnstable cargo option: -Zbuild-std Unstable cargo option: -Zbuild-std

A-crossArea: Cross compilation Area: Cross compilation

A-LTOArea: Link-time optimization (LTO) Area: Link-time optimization (LTO)

C-bugCategory: This is a bug. Category: This is a bug.

O-muslTarget: The musl libc Target: The musl libc

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue. Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#146109 In rust-lang/rust;

· jsen- opened on Sep 2, 2025

compiler and language documentation disagree on lifetime extension for array expressions

A-arrayArea: `[T; N]` Area: `[T; N]`

A-docsArea: Documentation for any part of the project, including the compiler, standard library, and tools Area: Documentation for any part of the project, including the compiler, standard library, and tools

A-temporary-lifetime-extensionArea: temporary lifetime extension Area: temporary lifetime extension

C-bugCategory: This is a bug. Category: This is a bug.

I-lang-nominatedNominated for discussion during a lang team meeting. Nominated for discussion during a lang team meeting.

P-lang-drag-1Lang team prioritization drag level 1. https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang Lang team prioritization drag level 1. https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue. Relevant to the compiler team, which will review and decide on the PR/issue.

T-langRelevant to the language team Relevant to the language team

T-lang-docsRelevant to the lang-docs team. Relevant to the lang-docs team.

Status: Open.

#146092 In rust-lang/rust;

· dianne opened on Sep 1, 2025

<code>std::sync::barrier::BarrierState</code> is not <code>RefUnwindSafe</code> anymore

C-bugCategory: This is a bug. Category: This is a bug.

I-prioritizeIssue: Indicates that prioritization has been requested for this issue. Issue: Indicates that prioritization has been requested for this issue.

regression-from-stable-to-nightlyPerformance or correctness regression from stable to nightly. Performance or correctness regression from stable to nightly.

T-libsRelevant to the library team, which will review and decide on the PR/issue. Relevant to the library team, which will review and decide on the PR/issue.

Status: Open.

#146087 In rust-lang/rust;

· weiznich opened on Sep 1, 2025

unreachable code is not detected with never to any coercion in a closure

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut. Area: Lints (warnings about flaws in source code) such as unused_mut.

C-bugCategory: This is a bug. Category: This is a bug.

F-never_type`#![feature(never_type)]` `#![feature(never_type)]`

L-false-negativeLint: False negative (should have fired but didn't). Lint: False negative (should have fired but didn't).

L-unreachable_codeLint: unreachable_code Lint: unreachable_code

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue. Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#146085 In rust-lang/rust;

· WaffleLapkin opened on Sep 1, 2025