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[ICE]: <code>entered unreachable code: unexpected autoderef error [FulfillmentError { .. } </code>

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

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

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.

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

Status: Open.

#151324 In rust-lang/rust;

· matthiaskrgr opened on Jan 18, 2026

Redundant memory stores with mut parameters in by-value returns

A-ABIArea: Concerning the application binary interface (ABI)Area: Concerning the application binary interface (ABI)

A-codegenArea: Code generationArea: Code generation

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.

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

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

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

#149762 In rust-lang/rust;

· andy091203 opened on Dec 8, 2025

"should not be mangling partially substituted polymorphic instance" with <code>impl_trait_in_assoc_type</code>

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

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

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

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.

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.

#146514 In rust-lang/rust;

· Jules-Bertholet opened on Sep 13, 2025

pclmulqdq intrinsics don't inline well across target_feature changes anymore

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.

A-target-featureArea: Enabling/disabling target features like AVX, Neon, etc.Area: Enabling/disabling target features like AVX, Neon, etc.

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

E-help-wantedCall for participation: Help is requested to fix this issue.Call for participation: Help is requested to fix this issue.

E-mediumCall for participation: Medium difficulty. Experience needed to fix: Intermediate.Call for participation: Medium difficulty. Experience needed to fix: Intermediate.

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

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

O-x86_64Target: x86-64 processors (like x86_64-*) (also known as amd64 and x64)Target: x86-64 processors (like x86_64-*) (also known as amd64 and x64)

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.

#139029 In rust-lang/rust;

· iximeow opened on Mar 27, 2025

ICE: <code>encountered a fresh type during canonicalization</code>

A-dyn-traitArea: trait objects, vtable layoutArea: trait objects, vtable layout

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

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

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

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

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.

#138891 In rust-lang/rust;

· matthiaskrgr opened on Mar 24, 2025

ICE: rustc panicked at compiler\rustc_middle\src\mir\interpret\queries.rs:104:13

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

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

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

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.

#138710 In rust-lang/rust;

· sososopy opened on Mar 19, 2025

<code>adt_sized_constraint</code> called on non-struct type

A-incr-compArea: Incremental compilationArea: Incremental compilation

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

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

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

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.

Status: Open.

#135287 In rust-lang/rust;

· Dig-Doug opened on Jan 9, 2025

Add a run-make test that checks our <code>core::ffi::c_*</code> types against Clang

A-FFIArea: Foreign function interface (FFI)Area: Foreign function interface (FFI)

A-testsuiteArea: The testsuite used to check the correctness of rustcArea: The testsuite used to check the correctness of rustc

E-hardCall for participation: Hard difficulty. Experience needed to fix: A lot.Call for participation: Hard difficulty. Experience needed to fix: A lot.

E-needs-designThis issue needs exploration and design to see how and if we can fix/implement itThis issue needs exploration and design to see how and if we can fix/implement it

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Open.

#133058 In rust-lang/rust;

· tgross35 opened on Nov 15, 2024

Official binaries for <code>wasm32-unknown-unknown</code> (and potentially other WASM platforms?) contain code for the wrong architecture

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

E-mediumCall for participation: Medium difficulty. Experience needed to fix: Intermediate.Call for participation: Medium difficulty. Experience needed to fix: Intermediate.

E-mentorCall for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion.Call for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion.

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

O-wasmTarget: WASM (WebAssembly), http://webassembly.org/Target: WASM (WebAssembly), http://webassembly.org/

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.

#132802 In rust-lang/rust;

· emilazy opened on Nov 9, 2024

[ICE]: maybe try to call <code>try_normalize_erasing_regions</code> instead

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

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

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.

#132767 In rust-lang/rust;

· ym-xie opened on Nov 8, 2024

Add a regression test for #132587

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

A-proc-macrosArea: Procedural macrosArea: Procedural macros

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

E-mediumCall for participation: Medium difficulty. Experience needed to fix: Intermediate.Call for participation: Medium difficulty. Experience needed to fix: Intermediate.

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

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.

#132727 In rust-lang/rust;

· jieyouxu opened on Nov 7, 2024

Inefficient implementation of <code>PartialEq</code> for nested (fieldless) enums

A-codegenArea: Code generationArea: Code generation

A-enumArea: Enums (discriminated unions, or more generally ADTs (algebraic data types))Area: Enums (discriminated unions, or more generally ADTs (algebraic data types))

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

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

I-heavyIssue: Problems and improvements with respect to binary size of generated code.Issue: Problems and improvements with respect to binary size of generated code.

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

#132628 In rust-lang/rust;

· zaneduffield opened on Nov 5, 2024