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Allow <code>#[must_use]</code> on associated types to warn on unused values in generic contexts

A-attributesArea: Attributes (`#[…]`, `#![…]`)Area: Attributes (`#[…]`, `#![…]`)

disposition-mergeThis issue / PR is in PFCP or FCP with a disposition to merge it.This issue / PR is in PFCP or FCP with a disposition to merge it.

finished-final-comment-periodThe final comment period is finished for this PR / Issue.The final comment period is finished for this PR / Issue.

needs-fcpThis change is insta-stable, or significant enough to need a team FCP to proceed.This change is insta-stable, or significant enough to need a team FCP to proceed.

S-waiting-on-documentationStatus: Waiting on approved PRs to documentation before mergingStatus: Waiting on approved PRs to documentation before merging

S-waiting-on-fcpStatus: PR is in FCP and is awaiting for FCP to complete.Status: PR is in FCP and is awaiting for FCP to complete.

T-langRelevant to the language teamRelevant to the language team

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

Status: Open (in progress).

rust-lang/rustnumber 142590

#142590 In rust-lang/rust;

· compiler-errors opened on Jun 16, 2025

Stabilize return type notation (RFC 3654)

disposition-mergeThis issue / PR is in PFCP or FCP with a disposition to merge it.This issue / PR is in PFCP or FCP with a disposition to merge it.

I-lang-radarItems that are on lang's radar and will need eventual work or consideration.Items that are on lang's radar and will need eventual work or consideration.

proposed-final-comment-periodProposed to merge/close by relevant subteam, see T-<team> label. Will enter FCP once signed off.Proposed to merge/close by relevant subteam, see T-<team> label. Will enter FCP once signed off.

S-waiting-on-documentationStatus: Waiting on approved PRs to documentation before mergingStatus: Waiting on approved PRs to documentation before merging

S-waiting-on-reviewStatus: Awaiting review from the assignee but also interested parties.Status: Awaiting review from the assignee but also interested parties.

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 (in progress).

rust-lang/rustnumber 138424

#138424 In rust-lang/rust;

· compiler-errors opened on Mar 12, 2025

Tracking Issue for <code>const_destruct</code>

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

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

PG-const-traitsProject group: Const traitsProject group: Const traits

T-langRelevant to the language teamRelevant to the language team

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.

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.

#133214 In rust-lang/rust;

· compiler-errors opened on Nov 19, 2024

Tracking Issue for <code>async_fn_in_dyn_trait</code>

B-experimentalBlocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).Blocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

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

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#133119 In rust-lang/rust;

· compiler-errors opened on Nov 16, 2024

Tracking Issue for return type notation

B-RFC-approvedBlocker: Approved by a merged RFC but not yet implemented.Blocker: Approved by a merged RFC but not yet implemented.

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-return_type_notation`#[feature(return_type_notation)]``#[feature(return_type_notation)]`

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#109417 In rust-lang/rust;

· compiler-errors opened on Mar 20, 2023