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Maybe-sized RPIT type is unexpectedly allowed in <code>async fn</code>

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

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

A-DSTsArea: Dynamically-sized types (DSTs)Area: Dynamically-sized types (DSTs)

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-trait-systemArea: Trait systemArea: Trait system

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

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.

#149438 In rust-lang/rust;

· obi1kenobi opened on Nov 29, 2025

Send bound on RPITIT async method causes spurious lifetime errors

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

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

fixed-by-higher-ranked-assumptionsFixed by `-Zhigher-ranked-assumptions`Fixed by `-Zhigher-ranked-assumptions`

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.

#149407 In rust-lang/rust;

· mincrmatt12 opened on Nov 28, 2025

Implementation is not general enough error with no context

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

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

A-type-systemArea: Type systemArea: Type system

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

D-terseDiagnostics: An error or lint that doesn't give enough information about the problem at hand.Diagnostics: An error or lint that doesn't give enough information about the problem at hand.

fixed-by-higher-ranked-assumptionsFixed by `-Zhigher-ranked-assumptions`Fixed by `-Zhigher-ranked-assumptions`

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.

#149235 In rust-lang/rust;

· Noratrieb opened on Nov 23, 2025

Internal Compiler Error

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

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

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-lifetimesArea: Lifetimes / regionsArea: Lifetimes / regions

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) ❄️

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

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

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.

#148511 In rust-lang/rust;

· swooster opened on Nov 5, 2025

Diagnostics incorrectly states that async closure implements <code>Fn</code>.

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

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

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

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.

#148391 In rust-lang/rust;

· theemathas opened on Nov 2, 2025

<code>async fn</code> can assign to argument to change its lifetime, but normal <code>fn</code> and <code>async</code> blocks cannot.

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

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

A-lifetimesArea: Lifetimes / regionsArea: Lifetimes / regions

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

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-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.

#148389 In rust-lang/rust;

· theemathas opened on Nov 2, 2025

<code>const</code> in <code>async fn</code> is evaluated twice when used across crates.

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

A-const-evalArea: Constant evaluation, covers all const contexts (static, const fn, ...)Area: Constant evaluation, covers all const contexts (static, const fn, ...)

A-monomorphizationArea: MonomorphizationArea: Monomorphization

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

I-compiletimeIssue: Problems and improvements with respect to compile times.Issue: Problems and improvements with respect to compile times.

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.

#148335 In rust-lang/rust;

· theemathas opened on Oct 31, 2025

Async function generates potentially panicking code

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

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

Status: Open.

#147041 In rust-lang/rust;

· ZhekaS opened on Sep 25, 2025

Disjoint capture in async blocks requires mut for Copy field modifications

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

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

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.

Status: Open.

#146547 In rust-lang/rust;

· DangerousVegetable opened on Sep 14, 2025

Cannot combine <code>async fn</code>-in-traits with <code>AsyncFn{,Mut}</code> closures

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

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

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

A-higher-rankedArea: Higher-ranked things (e.g., lifetimes, types, trait bounds aka HRTBs)Area: Higher-ranked things (e.g., lifetimes, types, trait bounds aka HRTBs)

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

fixed-by-higher-ranked-assumptionsFixed by `-Zhigher-ranked-assumptions`Fixed by `-Zhigher-ranked-assumptions`

Status: Open.

#145127 In rust-lang/rust;

· alexcrichton opened on Aug 8, 2025

dead value causes <code>async</code> future to not be <code>Send</code>

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

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.

#144391 In rust-lang/rust;

· jameysharp opened on Jul 24, 2025

Rust does not correctly handle async recursion with nice errors in certain cases

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

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

E-needs-mcveCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable ExampleCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example

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.

Status: Open.

#144344 In rust-lang/rust;

· cheesycod opened on Jul 23, 2025