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ICE in release builds from 1.90.0 onwards

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

A-mir-optArea: MIR optimizationsArea: MIR optimizations

A-mir-opt-inliningArea: MIR inliningArea: MIR inlining

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

P-highHigh priorityHigh priority

regression-from-stable-to-stablePerformance or correctness regression from one stable version to another.Performance or correctness regression from one stable version to another.

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.

#150263 In rust-lang/rust;

· zxqfd555 opened on Dec 22, 2025

ICE <code>invalid immediate for given destination place: scalar value has wrong size</code>

A-mir-optArea: MIR optimizationsArea: MIR optimizations

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) ❄️

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.

P-mediumMedium priorityMedium 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.

#149920 In rust-lang/rust;

· matthiaskrgr opened on Dec 12, 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

ICE: <code>statement with overlapping memory</code>

A-mir-optArea: MIR optimizationsArea: MIR optimizations

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

F-gen_blocks`gen {}` expressions that produce `Iterator`s`gen {}` expressions that produce `Iterator`s

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

S-has-bisectionStatus: A bisection has been found for this issueStatus: A bisection 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: Open.

#149748 In rust-lang/rust;

· matthiaskrgr opened on Dec 7, 2025

ICE <code>interpreter ran out of memory</code>

A-mir-optArea: MIR optimizationsArea: MIR optimizations

A-mir-opt-GVNArea: MIR opt Global Value Numbering (GVN)Area: MIR opt Global Value Numbering (GVN)

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) ❄️

P-mediumMedium priorityMedium priority

regression-from-stable-to-stablePerformance or correctness regression from one stable version to another.Performance or correctness regression from one stable version to another.

S-has-bisectionStatus: A bisection has been found for this issueStatus: A bisection 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: Open.

#149643 In rust-lang/rust;

· matthiaskrgr opened on Dec 4, 2025

·  

1.93.0

Array indexed by exhaustive match still generates bounds checks

A-mir-optArea: MIR optimizationsArea: MIR optimizations

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

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.

S-has-bisectionStatus: A bisection has been found for this issueStatus: A bisection 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: Open.

#149480 In rust-lang/rust;

· Arnavion opened on Nov 30, 2025

Figure out all debugging information representations of statements

A-debuginfoArea: Debugging information in compiled programs (DWARF, PDB, etc.)Area: Debugging information in compiled programs (DWARF, PDB, etc.)

A-mir-optArea: MIR optimizationsArea: MIR optimizations

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

Status: Open.

#147679 In rust-lang/rust;

· dianqk opened on Oct 14, 2025

SignatureMismatch ICE

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

A-mir-optArea: MIR optimizationsArea: MIR optimizations

A-mir-opt-inliningArea: MIR inliningArea: MIR inlining

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

P-highHigh priorityHigh priority

regression-from-stable-to-stablePerformance or correctness regression from one stable version to another.Performance or correctness regression from one stable version to another.

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.

#146965 In rust-lang/rust;

· benruijl opened on Sep 24, 2025

Missed optimization: multiple instances of a small struct don't reuse the stack allocation

A-codegenArea: Code generationArea: Code generation

A-MIRArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.htmlArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html

A-mir-optArea: MIR optimizationsArea: MIR optimizations

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

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-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#141649 In rust-lang/rust;

· ohadravid opened on May 27, 2025

ICE: mir opts crash rustc with -Zmir-preserve-ub in compiler/rustc_mir_transform/src/simplify_comparison_integral.rs

A-mir-optArea: MIR optimizationsArea: MIR optimizations

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.

#141454 In rust-lang/rust;

· matthiaskrgr opened on May 23, 2025

Ensure we can optimize out does-nothing <code>drop</code>s like <code>array::IntoIter&lt;NotNeedsDrop, N&gt;</code>

A-mir-optArea: MIR optimizationsArea: MIR optimizations

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

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.

#139422 In rust-lang/rust;

· scottmcm opened on Apr 5, 2025

Simple <code>Option</code> use, like in <code>checked_sub</code>, should optimize out fully in MIR

A-mir-optArea: MIR optimizationsArea: MIR optimizations

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

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.

Enhancement

#138544 In rust-lang/rust;

· scottmcm opened on Mar 15, 2025