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<code>closure-returning-async-block</code> suggestion causes <code>does not live long enough</code> error

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

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

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

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

D-invalid-suggestionDiagnostics: A structured suggestion resulting in incorrect code.Diagnostics: A structured suggestion resulting in incorrect 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.

#142145 In rust-lang/rust;

· matthiaskrgr opened on Jun 7, 2025

parallel rustc: async closures not reproducible

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

A-parallel-compilerArea: parallel compilerArea: parallel compiler

A-reproducibilityArea: Reproducible / deterministic buildsArea: Reproducible / deterministic builds

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.

#140425 In rust-lang/rust;

· matthiaskrgr opened on Apr 29, 2025

<code>async closure does not implement </code><code>FnMut</code><code> because it captures state from its environment</code> for <code>async move</code> closures capturing copyable values, while closures returning <code>async move</code> blocks work fine

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

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.

#140403 In rust-lang/rust;

· ProbstDJakob opened on Apr 28, 2025

[async closure] implementation of <code>Send</code> is not general enough using tokio channel

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

A-auto-traitsArea: auto traits (e.g., `auto trait Send {}`)Area: auto traits (e.g., `auto trait Send {}`)

A-concurrencyArea: ConcurrencyArea: Concurrency

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

Status: Open.

#139475 In rust-lang/rust;

· Banyc opened on Apr 7, 2025

<code>AsyncFnOnce(…)</code> and <code>FnOnce&lt;(…), Output : Future&gt;</code> are not equivalent

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

C-discussionCategory: Discussion or questions that doesn't represent real issues.Category: Discussion or questions that doesn't represent real issues.

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.

#139173 In rust-lang/rust;

· danielhenrymantilla opened on Mar 31, 2025

async closure argument type inference error has wrong span

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

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

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.

#139150 In rust-lang/rust;

· cyrgani opened on Mar 30, 2025

Compiler error "implementation of Send is not general enough" when using static lifetime reference with async closure

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

A-lifetimesArea: Lifetimes / regionsArea: Lifetimes / regions

A-trait-systemArea: Trait systemArea: Trait system

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.

#138494 In rust-lang/rust;

· zhuerzhuer opened on Mar 14, 2025

Can't compile the use of <code>impl AsyncFn</code> within a spawned thread

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

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

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.

#138207 In rust-lang/rust;

· jephthia opened on Mar 8, 2025

Type inference issue with <code>|| async {}</code> closure in AsyncFn

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

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

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.

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.

#136696 In rust-lang/rust;

· ThriceCola opened on Feb 7, 2025

Higher ranked lifetime error when checking auto traits of async functions containing calls to async closures which capture a local

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

A-auto-traitsArea: auto traits (e.g., `auto trait Send {}`)Area: auto traits (e.g., `auto trait Send {}`)

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.

#134997 In rust-lang/rust;

· jdonszelmann opened on Jan 1, 2025

Invalid suggestion for <code>AsyncFnOnce</code> trait object

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

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

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

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.

#134182 In rust-lang/rust;

· ehuss opened on Dec 11, 2024

<code>dyn AsyncFn</code> generates many independent errors

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

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

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

D-verboseDiagnostics: Too much output caused by a single piece of incorrect code.Diagnostics: Too much output caused by a single piece of incorrect 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.

#132713 In rust-lang/rust;

· cramertj opened on Nov 6, 2024