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library: core: document layout guarantee of <code>TypeId</code>

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

I-libs-api-nominatedNominated for discussion during a libs-api team meeting.Nominated for discussion during a libs-api team meeting.

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-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-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 148265

#148265 In rust-lang/rust;

· dakr opened on Oct 29, 2025

add trait impls to proc_macro::Ident

I-libs-api-nominatedNominated for discussion during a libs-api team meeting.Nominated for discussion during a libs-api team meeting.

S-waiting-on-t-libs-apiStatus: Awaiting decision from T-libs-apiStatus: Awaiting decision from T-libs-api

T-clippyRelevant to the Clippy team.Relevant to the Clippy 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.

Status: Open (in progress).

rust-lang/rustnumber 146553

#146553 In rust-lang/rust;

· Qelxiros opened on Sep 14, 2025

Experiment: Add <code>where T: Default</code> to <code>Default for [T; 0]</code> impl.

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.

I-libs-api-nominatedNominated for discussion during a libs-api team meeting.Nominated for discussion during a libs-api team meeting.

S-experimentalStatus: Ongoing experiment that does not require reviewing and won't be merged in its current state.Status: Ongoing experiment that does not require reviewing and won't be merged in its current state.

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Draft (not ready).

rust-lang/rustnumber 145457

#145457 In rust-lang/rust;

· m-ou-se opened on Aug 15, 2025