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unnecessary closure constraint propagation

A-borrow-checkerArea: The borrow checkerArea: The borrow checker

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

A-higher-rankedArea: Higher-ranked things (e.g., lifetimes, types, trait bounds aka HRTBs)Area: Higher-ranked things (e.g., lifetimes, types, trait bounds aka HRTBs)

A-lifetimesArea: Lifetimes / regionsArea: Lifetimes / regions

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

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.

#148289 In rust-lang/rust;

· lcnr opened on Oct 30, 2025

member constraints involving external regions are scuffed

A-borrow-checkerArea: The borrow checkerArea: The borrow checker

A-impl-traitArea: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch.Area: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch.

A-lifetimesArea: Lifetimes / regionsArea: Lifetimes / regions

A-type-systemArea: Type systemArea: Type system

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-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.

#146062 In rust-lang/rust;

· lcnr opened on Aug 31, 2025

Treat cycle errors as bug by default

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

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

C-cleanupCategory: PRs that clean code up or issues documenting cleanup.Category: PRs that clean code up or issues documenting cleanup.

I-cycleIssue: A query cycle occurred while none was expectedIssue: A query cycle occurred while none was expected

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.

#145611 In rust-lang/rust;

· lcnr opened on Aug 19, 2025

· 

1.90.0

shadowed traits from glob imports in the same scope get ignored

A-resolveArea: Name/path resolution done by `rustc_resolve` specificallyArea: Name/path resolution done by `rustc_resolve` specifically

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.

#144993 In rust-lang/rust;

· lcnr opened on Aug 6, 2025

TAITs must not require fewer bounds than their defining scope

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

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

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

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

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

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.

#142239 In rust-lang/rust;

· lcnr opened on Jun 9, 2025

<code>lemmy_db_views_modlog_combined</code> has a weird performance regression

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

E-needs-mcveCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable ExampleCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example

I-compiletimeIssue: Problems and improvements with respect to compile times.Issue: Problems and improvements with respect to compile times.

P-highHigh priorityHigh priority

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

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.

#141006 In rust-lang/rust;

· lcnr opened on May 14, 2025

member constraints are order-dependent

A-impl-traitArea: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch.Area: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch.

A-member-constraints`#[feature(member_constraints)]``#[feature(member_constraints)]`

A-NLLArea: Non-lexical lifetimes (NLL)Area: Non-lexical lifetimes (NLL)

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

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.

#140569 In rust-lang/rust;

· lcnr opened on May 2, 2025

<code>trivial_bounds</code> lint lints on non-global associated type constraints

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-trivial_bounds`#![feature(trivial_bounds)]``#![feature(trivial_bounds)]`

L-trivial_boundsLint: trivial_boundsLint: trivial_bounds

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.

#140311 In rust-lang/rust;

· lcnr opened on Apr 25, 2025

no suggestion to enable const generics features

A-const-genericsArea: const generics (parameters and arguments)Area: const generics (parameters and arguments)

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

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

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.

#139645 In rust-lang/rust;

· lcnr opened on Apr 10, 2025

rustdoc incorrectly prints APIT in <code>AliasTy::new</code>

A-cross-crate-reexportsArea: Documentation that has been re-exported from a different crateArea: Documentation that has been re-exported from a different crate

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

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

S-has-mcveStatus: A Minimal Complete and Verifiable Example has been found for this issueStatus: A Minimal Complete and Verifiable Example has been found for this issue

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.

Status: Open.

#138604 In rust-lang/rust;

· lcnr opened on Mar 17, 2025

empty arg lists get ignored when considering whether to apply default args

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-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.

#136488 In rust-lang/rust;

· lcnr opened on Feb 3, 2025

<code>PostAnalysisNormalize</code> can introduce new <code>{type_error}</code>

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) ❄️

S-bug-has-testStatus: This bug is tracked inside the repo by a `known-bug` test.Status: This bug is tracked inside the repo by a `known-bug` test.

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.

#135528 In rust-lang/rust;

· lcnr opened on Jan 15, 2025