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Policy on the use of <code>rustc_legacy_const_generics</code> in stdarch

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

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.

final-comment-periodIn the final comment period and will be merged soon unless new substantive objections are raised.In the final comment period and will be merged soon unless new substantive objections are raised.

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.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#149654 In rust-lang/rust;

· Amanieu opened on Dec 4, 2025

resolve: Report more visibility-related early resolution ambiguities for imports

A-resolveArea: Name/path resolution done by `rustc_resolve` specificallyArea: Name/path resolution done by `rustc_resolve` specifically

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-nominatedNominated for discussion during a lang team meeting.Nominated for discussion during a lang team meeting.

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.

P-lang-drag-1Lang team prioritization drag level 1. https://rust-lang.zulipchat.com/#narrow/channel/410516-t-langLang team prioritization drag level 1. https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang

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-t-langStatus: Awaiting decision from T-langStatus: Awaiting decision from T-lang

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

Status: Open (in progress).

rust-lang/rustnumber 149596

#149596 In rust-lang/rust;

· petrochenkov opened on Dec 3, 2025

thread::scope: document how join interacts with TLS destructors

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.

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

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 (in progress).

rust-lang/rustnumber 149482

#149482 In rust-lang/rust;

· RalfJung opened on Nov 30, 2025

refactor: remove Ord bound from BinaryHeap::new etc

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.

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.

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

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 (in progress).

rust-lang/rustnumber 149408

#149408 In rust-lang/rust;

· aatifsyed opened on Nov 28, 2025

const-eval: always do mem-to-mem copies if there might be padding involved

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-nominatedNominated for discussion during a lang team meeting.Nominated for discussion during a lang team meeting.

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.

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.

P-lang-drag-1Lang team prioritization drag level 1. https://rust-lang.zulipchat.com/#narrow/channel/410516-t-langLang team prioritization drag level 1. https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang

perf-regressionPerformance regression.Performance regression.

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-t-langStatus: Awaiting decision from T-langStatus: Awaiting decision from T-lang

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

Status: Open (in progress).

rust-lang/rustnumber 148967

#148967 In rust-lang/rust;

· RalfJung opened on Nov 15, 2025

Warn on codegen attributes on required trait methods

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.

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.

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

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

to-announceAnnounce this issue on triage meetingAnnounce this issue on triage meeting

Status: Open (in progress).

rust-lang/rustnumber 148756

#148756 In rust-lang/rust;

· JonathanBrouwer opened on Nov 9, 2025

Stabilize the <code>supertrait_item_shadowing</code> feature

A-compiler-builtinsArea: compiler-builtins (https://github.com/rust-lang/compiler-builtins)Area: compiler-builtins (https://github.com/rust-lang/compiler-builtins)

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-nominatedNominated for discussion during a lang team meeting.Nominated for discussion during a lang team meeting.

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.

P-lang-drag-1Lang team prioritization drag level 1. https://rust-lang.zulipchat.com/#narrow/channel/410516-t-langLang team prioritization drag level 1. https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang

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-t-langStatus: Awaiting decision from T-langStatus: Awaiting decision from T-lang

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 (in progress).

rust-lang/rustnumber 148605

#148605 In rust-lang/rust;

· Amanieu opened on Nov 6, 2025

Better closure requirement propagation.

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.

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

S-waiting-on-t-typesStatus: Awaiting decision from T-typesStatus: Awaiting decision from T-types

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.

to-announceAnnounce this issue on triage meetingAnnounce this issue on triage meeting

Status: Open (in progress).

rust-lang/rustnumber 148329

#148329 In rust-lang/rust;

· LorrensP-2158466 opened on Oct 31, 2025

parser/lexer: bump to Unicode 17, use faster unicode-ident

A-tidyArea: The tidy toolArea: The tidy tool

A-UnicodeArea: UnicodeArea: Unicode

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.

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.

relnotesMarks issues that should be documented in the release notes of the next release.Marks issues that should be documented in the release notes of the next release.

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

T-bootstrapRelevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

T-langRelevant to the language teamRelevant to the language team

Status: Open (in progress).

rust-lang/rustnumber 148321

#148321 In rust-lang/rust;

· Marcondiro opened on Oct 31, 2025

Consider <code>Result&lt;T, Uninhabited&gt;</code> and <code>ControlFlow&lt;Uninhabited, T&gt;</code> to be equivalent to <code>T</code> for must use lint

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

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-nominatedNominated for discussion during a lang team meeting.Nominated for discussion during a lang team meeting.

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.

L-unused_must_useLint: unused_must_useLint: unused_must_use

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.

P-lang-drag-1Lang team prioritization drag level 1. https://rust-lang.zulipchat.com/#narrow/channel/410516-t-langLang team prioritization drag level 1. https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang

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.

relnotesMarks issues that should be documented in the release notes of the next release.Marks issues that should be documented in the release notes of the next release.

S-waiting-on-t-langStatus: Awaiting decision from T-langStatus: Awaiting decision from T-lang

T-langRelevant to the language teamRelevant to the language team

Status: Open (in progress).

rust-lang/rustnumber 148214

#148214 In rust-lang/rust;

· WaffleLapkin opened on Oct 28, 2025

Stabilize Frontmatter

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.

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

I-lang-nominatedNominated for discussion during a lang team meeting.Nominated for discussion during a lang team meeting.

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.

P-lang-drag-1Lang team prioritization drag level 1. https://rust-lang.zulipchat.com/#narrow/channel/410516-t-langLang team prioritization drag level 1. https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang

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-styleRelevant to the style team, which will review and decide on the PR/issue.Relevant to the style team, which will review and decide on the PR/issue.

Status: Open (in progress).

rust-lang/rustnumber 148051

#148051 In rust-lang/rust;

· epage opened on Oct 23, 2025

Always make tuple elements a coercion site

A-coercionsArea: implicit and explicit `expr as Type` coercionsArea: implicit and explicit `expr as Type` coercions

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.

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

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.

perf-regressionPerformance regression.Performance regression.

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.

relnotesMarks issues that should be documented in the release notes of the next release.Marks issues that should be documented in the release notes of the next release.

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-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 147834

#147834 In rust-lang/rust;

· WaffleLapkin opened on Oct 17, 2025