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Draft release notes for 1.94.0

T-releaseRelevant to the release subteam, which will review and decide on the PR/issue.Relevant to the release subteam, which will review and decide on the PR/issue.

Status: Open.

#151650 In rust-lang/rust;

· Mark-Simulacrum opened on Jan 25, 2026

·  

1.94.0

mGCA: Assoc const projections don't induce ambient object lifetime defaults

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

A-lifetimesArea: Lifetimes / regionsArea: Lifetimes / regions

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

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

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

S-blockedStatus: Blocked on something else such as an RFC or other implementation work.Status: Blocked on something else such as an RFC or other implementation work.

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.

#151649 In rust-lang/rust;

· fmease opened on Jan 25, 2026

[ICE]: <code> did not expect successful goal when collecting ambiguity errors</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) ❄️

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.

#151648 In rust-lang/rust;

· matthiaskrgr opened on Jan 25, 2026

ICE: mGCA+GCPT+GCI: Broken MIR: equate_normalized_input_or_output: NoSolution

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

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

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

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.

#151647 In rust-lang/rust;

· fmease opened on Jan 25, 2026

Atomic missing wait and notify_* while C++20 supports that

A-atomicArea: Atomics, barriers, and sync primitivesArea: Atomics, barriers, and sync primitives

A-concurrencyArea: ConcurrencyArea: Concurrency

C-feature-requestCategory: A feature request, i.e: not implemented / a PR.Category: A feature request, i.e: not implemented / a PR.

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

Status: Open.

#151644 In rust-lang/rust;

· npuichigo opened on Jan 25, 2026

rustc <code>--color always</code> doesn't always output color

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.

#151643 In rust-lang/rust;

· JayanAXHF opened on Jan 25, 2026

mGCA: We don't properly check associated const bindings for well-formedness

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

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

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.

#151642 In rust-lang/rust;

· fmease opened on Jan 25, 2026

Unsoundness due to closure return value not being checked for WF

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

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

A-lifetimesArea: Lifetimes / regionsArea: Lifetimes / regions

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

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

I-prioritizeIssue: Indicates that prioritization has been requested for this issue.Issue: Indicates that prioritization has been requested for this issue.

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

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.

#151637 In rust-lang/rust;

· theemathas opened on Jan 25, 2026

Next solver hangs on cyclic associated type projection in blanket implementation bounds

A-trait-systemArea: Trait systemArea: Trait system

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.

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.

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

Status: Open.

#151636 In rust-lang/rust;

· trait-Cong opened on Jan 25, 2026

Hang in trait resolution with and without <code>-Znext-solver</code>

A-trait-systemArea: Trait systemArea: Trait system

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.

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.

#151632 In rust-lang/rust;

· elimayano opened on Jan 25, 2026

ICE: Panic in <code>typeck</code> with <code>generic_const_items</code> and <code>impl Trait</code> associated const equality

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

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

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.

#151631 In rust-lang/rust;

· elimayano opened on Jan 25, 2026

[ICE]: <code>ty::ConstKind::Error constructed but no error reported</code>

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

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

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

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

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.

#151625 In rust-lang/rust;

· reddevilmidzy opened on Jan 25, 2026