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Compiler hang with nested <code>impl Trait</code> and multiple lifetime bounds in associated type

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.

#153164�?In rust-lang/rust;

· Anonymous1-design opened on Feb 27, 2026

ICE: cannot find <code>R/#0</code> in param-env when using generic parameters in const operations

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.

#153163�?In rust-lang/rust;

· Anonymous1-design opened on Feb 27, 2026

<code>Vec</code>'s const_make_global method erroring when <code>Vec</code> is empty

A-collectionsArea: `std::collections`Area: `std::collections`

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

F-const_heap`#[feature(const_heap)]``#[feature(const_heap)]`

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-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.

#153158�?In rust-lang/rust;

· izagawd opened on Feb 26, 2026

Too many errors for missing crate for nested imports and later uses of crate

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

D-verboseDiagnostics: Too much output caused by a single piece of incorrect code.Diagnostics: Too much output caused by a single piece of incorrect 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.

#153156�?In rust-lang/rust;

· estebank opened on Feb 26, 2026

Performance regression (30%) between Rust 1.90 and 1.91

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-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.

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

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.

regression-untriagedUntriaged performance or correctness regression.Untriaged performance or correctness regression.

Status: Open.

#153154�?In rust-lang/rust;

· plafer opened on Feb 26, 2026

Inconsistent lifetime specifier requirements depending on whether <code>self</code> is defined directly or using a <code>type</code>

A-lifetimesArea: Lifetimes / regionsArea: Lifetimes / regions

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

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

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.

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.

#153148�?In rust-lang/rust;

· DervexDev opened on Feb 26, 2026

download-ci-llvm depends on the repo clone depth

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

T-bootstrapRelevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

Status: Open.

#153146�?In rust-lang/rust;

· ehuss opened on Feb 26, 2026

<code>unused_result</code> lint generates warnings for uninhabited types

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.

#153144�?In rust-lang/rust;

· Jeff-A-Martin opened on Feb 26, 2026

Standalone <code>$</code> is accepted as a token in declarative macros.

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.

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.

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.

#153142�?In rust-lang/rust;

· cafce25 opened on Feb 26, 2026

<code>Assoc: Trait</code> constraints with projection types in generics fail to type-check

A-trait-systemArea: Trait systemArea: Trait system

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

fixed-by-next-solverFixed by the next-generation trait solver, `-Znext-solver`.Fixed by the next-generation trait solver, `-Znext-solver`.

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.

#153141�?In rust-lang/rust;

· Radbuglet opened on Feb 26, 2026

closures are not required to outlive generic arguments mentioned in their body

A-closuresArea: Closures (`|…| { … }`)Area: Closures (`|…| { … }`)

A-lifetimesArea: Lifetimes / regionsArea: Lifetimes / regions

A-type-systemArea: Type systemArea: Type system

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

P-lowLow priorityLow priority

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.

#153140�?In rust-lang/rust;

· lcnr opened on Feb 26, 2026

Bodiless match arms not being unconditionally syntactically legal is surprising and unprincipled

A-grammarArea: The grammar of RustArea: The grammar of Rust

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

A-patternsRelating to patterns and pattern matchingRelating to patterns and pattern matching

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

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

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.

#153134�?In rust-lang/rust;

· fmease opened on Feb 26, 2026