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“attributes on expressions are experimental” error should be more accurate and helpful

A-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lints

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.

#147853 In rust-lang/rust;

· kpreid opened on Oct 18, 2025

Tracking issue for release notes of #146961: Allow passing <code>expr</code> metavariable to <code>cfg</code>

A-attributesArea: Attributes (`#[…]`, `#![…]`)Area: Attributes (`#[…]`, `#![…]`)

A-cfgArea: `cfg` conditional compilationArea: `cfg` conditional compilation

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

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

relnotesMarks issues that should be documented in the release notes of the next release.Marks issues that should be documented in the release notes of the next release.

relnotes-tracking-issueMarks issues tracking what text to put in release notes.Marks issues tracking what text to put in release notes.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#147852 In rust-lang/rust;

· rustbot opened on Oct 18, 2025

Contract attributes gives its output all the same span

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

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

Status: Open.

#147851 In rust-lang/rust;

· jdonszelmann opened on Oct 18, 2025

Tracking issue for release notes of #146098: Temporary lifetime extension for blocks

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

relnotesMarks issues that should be documented in the release notes of the next release.Marks issues that should be documented in the release notes of the next release.

relnotes-tracking-issueMarks issues tracking what text to put in release notes.Marks issues tracking what text to put in release notes.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#147850 In rust-lang/rust;

· rustbot opened on Oct 18, 2025

Stripped executables don't print backtrace with RUST_BACKTRACE=1

A-backtraceArea: BacktracesArea: Backtraces

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

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

Status: Open.

#147846 In rust-lang/rust;

· bjorn3 opened on Oct 18, 2025

Tracking issue for release notes of #147834: Always make tuple elements a coercion site

A-coercionsArea: implicit and explicit `expr as Type` coercionsArea: implicit and explicit `expr as Type` coercions

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

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

relnotesMarks issues that should be documented in the release notes of the next release.Marks issues that should be documented in the release notes of the next release.

relnotes-tracking-issueMarks issues tracking what text to put in release notes.Marks issues tracking what text to put in release notes.

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-typesRelevant to the types team, which will review and decide on the PR/issue.Relevant to the types team, which will review and decide on the PR/issue.

Status: Open.

#147835 In rust-lang/rust;

· rustbot opened on Oct 17, 2025

Redundant bounds check when indexing array with enum in Rust 1.90

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

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.

#147831 In rust-lang/rust;

· ictrobot opened on Oct 17, 2025

Tracking issue for release notes of #147022: Remove current code for embedding command-line args in PDB

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

A-run-makeArea: port run-make Makefiles to rmake.rsArea: port run-make Makefiles to rmake.rs

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

relnotesMarks issues that should be documented in the release notes of the next release.Marks issues that should be documented in the release notes of the next release.

relnotes-tracking-issueMarks issues tracking what text to put in release notes.Marks issues tracking what text to put in release notes.

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.

#147829 In rust-lang/rust;

· rustbot opened on Oct 17, 2025

Tracking issue for release notes of #146725: <code>-Znext-solver</code> instantiate predicate binder without recanonicalizing goal

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

relnotesMarks issues that should be documented in the release notes of the next release.Marks issues that should be documented in the release notes of the next release.

relnotes-tracking-issueMarks issues tracking what text to put in release notes.Marks issues tracking what text to put in release notes.

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

WG-trait-system-refactorThe Rustc Trait System Refactor Initiative (-Znext-solver)The Rustc Trait System Refactor Initiative (-Znext-solver)

Status: Open.

#147828 In rust-lang/rust;

· rustbot opened on Oct 17, 2025

compiler error in correct program with specific declarative macros

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

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

Status: Open.

#147855 In rust-lang/rust;

· PlexSheep opened on Oct 17, 2025

Unstable fingerprints in <code>evaluate_obligation</code>

A-incr-compArea: Incremental compilationArea: Incremental compilation

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

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

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.

#147825 In rust-lang/rust;

· Noratrieb opened on Oct 17, 2025

Should importing a <code>#[macro_export] macro_rules!</code> macro trigger <code>unused_imports</code>?

A-decl-macros-1-2Area: Declarative macros 1.2Area: Declarative macros 1.2

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.

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

C-discussionCategory: Discussion or questions that doesn't represent real issues.Category: Discussion or questions that doesn't represent real issues.

L-unused_importsLint: unused_importsLint: unused_imports

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 teamRelevant to the language team

Status: Open.

#147823 In rust-lang/rust;

· SabrinaJewson opened on Oct 17, 2025