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<code>self</code>-receiving trait function behaves different than <code>drop</code> when GATs are involved

A-GATsArea: Generic associated types (GATs)Area: Generic associated types (GATs)

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.

#151755 In rust-lang/rust;

· tingerrr opened on Jan 27, 2026

Hang: Compiler hang in resolving Matrix&lt;(), &gt; with GATs [next-solver]

A-GATsArea: Generic associated types (GATs)Area: Generic associated types (GATs)

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

I-hangIssue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.Issue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.

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.

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

Status: Open.

#151503 In rust-lang/rust;

· trait-Cong opened on Jan 22, 2026

GAT implementation requires bounds inconsistently

A-GATsArea: Generic associated types (GATs)Area: Generic associated types (GATs)

A-trait-systemArea: Trait systemArea: Trait system

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-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.

#150417 In rust-lang/rust;

· QuineDot opened on Dec 27, 2025

Circularly defined GAT is somehow allowed and ICEs Miri

A-associated-itemsArea: Associated items (types, constants & functions)Area: Associated items (types, constants & functions)

A-GATsArea: Generic associated types (GATs)Area: Generic associated types (GATs)

A-mir-optArea: MIR optimizationsArea: MIR optimizations

A-miriArea: The miri toolArea: The miri tool

A-trait-systemArea: Trait systemArea: Trait system

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-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.

#149898 In rust-lang/rust;

· theemathas opened on Dec 12, 2025

Hang in mutually recursive GAT projections involving HRTBs

A-GATsArea: Generic associated types (GATs)Area: Generic associated types (GATs)

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-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`.

I-hangIssue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.Issue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.

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.

#149414 In rust-lang/rust;

· zhao-weibo opened on Nov 28, 2025

E0195 when method lifetime used on a GAT inside an APIT in trait is inlined and unused

A-GATsArea: Generic associated types (GATs)Area: Generic associated types (GATs)

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.

#147273 In rust-lang/rust;

· SOF3 opened on Oct 2, 2025

Parameters in generic associated types do not propagate if unused

A-GATsArea: Generic associated types (GATs)Area: Generic associated types (GATs)

A-inferenceArea: Type inferenceArea: Type inference

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

Status: Open.

#144858 In rust-lang/rust;

· SuperSamus opened on Aug 3, 2025

Incorrect rejection of async code on type not living long enough

A-async-awaitArea: Async & AwaitArea: Async & Await

A-GATsArea: Generic associated types (GATs)Area: Generic associated types (GATs)

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.

#143429 In rust-lang/rust;

· davidv1992 opened on Jul 4, 2025

We don't imply outlives-bounds from the own explicit bounds of a GAT projection

A-associated-itemsArea: Associated items (types, constants & functions)Area: Associated items (types, constants & functions)

A-GATsArea: Generic associated types (GATs)Area: Generic associated types (GATs)

A-implied-boundsArea: Implied bounds / inferred outlives-boundsArea: Implied bounds / inferred outlives-bounds

A-lifetimesArea: Lifetimes / regionsArea: Lifetimes / regions

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

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.

#141692 In rust-lang/rust;

· fmease opened on May 28, 2025

endless loop instead of an overflow error, in the presence of multiple requirements that would overflow.

A-GATsArea: Generic associated types (GATs)Area: Generic associated types (GATs)

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-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`.

I-hangIssue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.Issue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.

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.

#140946 In rust-lang/rust;

· moshevds opened on May 12, 2025

ICE - Mixing Async &amp; GAT traits (invalid code)

A-GATsArea: Generic associated types (GATs)Area: Generic associated types (GATs)

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.

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-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.

#140381 In rust-lang/rust;

· AldaronLau opened on Apr 28, 2025

compiler trait solver gets stuck (infinite loop or tail recursion?), related to GAT and associated type equality constraint

A-GATsArea: Generic associated types (GATs)Area: Generic associated types (GATs)

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`.

I-hangIssue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.Issue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.

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.

#134370 In rust-lang/rust;

· nerditation opened on Dec 16, 2024