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Const generic type inference works when it should not

A-inferenceArea: Type inferenceArea: Type inference

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

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

P-lowLow priorityLow priority

requires-incomplete-featuresThis issue requires the use of incomplete features.This issue requires the use of incomplete features.

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.

#142378 In rust-lang/rust;

· nazar-pc opened on Jun 11, 2025

<code>type annotations needed</code> for <code>if let Some(whatever) = todo!() {</code> not very helpful

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

A-inferenceArea: Type inferenceArea: Type inference

A-patternsRelating to patterns and pattern matchingRelating to patterns and pattern matching

D-lack-of-suggestionDiagnostics: Adding a (structured) suggestion would increase the quality of the diagnostic.Diagnostics: Adding a (structured) suggestion would increase the quality of the diagnostic.

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.

#141742 In rust-lang/rust;

· matthiaskrgr opened on May 29, 2025

type inference failure confusing diagnostic let Some(x) = None for [u8]

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

A-inferenceArea: Type inferenceArea: Type inference

D-confusingDiagnostics: Confusing error or lint that should be reworked.Diagnostics: Confusing error or lint that should be reworked.

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.

#141336 In rust-lang/rust;

· midnightveil opened on May 21, 2025

Unexpected type inference failure when comparing Vec::&lt;T&gt;::new() to an empty array []

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.

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.

#141329 In rust-lang/rust;

· 623637646 opened on May 21, 2025

Diverging expression not detected inside a <code>while</code> condition

A-inferenceArea: Type inferenceArea: Type inference

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.

T-langRelevant to the language teamRelevant to the language team

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.

#141274 In rust-lang/rust;

· theemathas opened on May 20, 2025

Making trait method <code>async</code> causes inference failure (E0790)

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

A-inferenceArea: Type inferenceArea: Type inference

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.

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.

#140987 In rust-lang/rust;

· benschulz opened on May 14, 2025

Bug: chained where T: trait multiple applicable items

A-inferenceArea: Type inferenceArea: Type inference

A-method-lookupArea: method lookup (typeck, post `rustc_resolve`, not to be confused with `A-resolve`)Area: method lookup (typeck, post `rustc_resolve`, not to be confused with `A-resolve`)

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.

#140892 In rust-lang/rust;

· RoDmitry opened on May 10, 2025

Type annotations needed for closure with associated type

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

A-inferenceArea: Type inferenceArea: Type inference

C-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.

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.

#140603 In rust-lang/rust;

· camsteffen opened on May 3, 2025

Unexpected "cannot infer type"

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

A-inferenceArea: Type inferenceArea: Type inference

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.

#140262 In rust-lang/rust;

· Spxg opened on Apr 24, 2025

Strange inference failure with <code>Arc::new_cyclic</code>

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.

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.

#139736 In rust-lang/rust;

· Sky9x opened on Apr 13, 2025

Type inference regression in 1.86 stable, due to unstable ByteStr

A-inferenceArea: Type inferenceArea: Type inference

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

regression-untriagedUntriaged performance or correctness regression.Untriaged performance or correctness regression.

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.

#139542 In rust-lang/rust;

· beanow-at-crabnebula opened on Apr 8, 2025

ICE: stack overflow with <code>-Ztyping-mode-borrowck</code> in inference

A-impl-traitArea: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch.Area: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch.

A-inferenceArea: Type inferenceArea: Type inference

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

I-crashIssue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.

requires-nightlyThis issue requires a nightly compiler in some way.This issue requires a nightly compiler in some way.

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.

#139446 In rust-lang/rust;

· matthiaskrgr opened on Apr 6, 2025