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cycle detected when optimizing MIR

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

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

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

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

Status: Closed (completed).

#143700 In rust-lang/rust;

· by estebank was closed on Jul 19, 2025

Cycle detected when optimizing MIR on nightly

A-async-closures`async || {}` `async || {}`

A-mir-optArea: MIR optimizations Area: MIR optimizations

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

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

Status: Closed (completed).

#129811 In rust-lang/rust;

· by chvck was closed on Sep 8, 2024

Cycle error when combining RPITIT, generic bounds equality, and lifetimes

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

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

I-cycleIssue: A query cycle occurred while none was expected Issue: 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: Closed (completed).

#122019 In rust-lang/rust;

· by jhpratt was closed on Mar 7, 2024

ice: broken mir: <code>{type error}</code>

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)]`

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

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: Closed (completed).

#120253 In rust-lang/rust;

· by matthiaskrgr was closed on Jan 27, 2024

query cycle: <code>cycle detected when checking effective visibilities</code>

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

I-cycleIssue: A query cycle occurred while none was expected Issue: 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: Closed (completed).

#119346 In rust-lang/rust;

· by matthiaskrgr was closed on Jan 5, 2024

ICE "index out of bounds" in <code>xform_self_ty</code>

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

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

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: Closed (completed).

#105152 In rust-lang/rust;

· by jruderman was closed on Dec 3, 2022