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Rollup of 15 pull requests

A-compiletestArea: The compiletest test runnerArea: The compiletest test runner

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

A-metaArea: Issues & PRs about the rust-lang/rust repository itselfArea: Issues & PRs about the rust-lang/rust repository itself

A-rustdoc-searchArea: Rustdoc's search featureArea: Rustdoc's search feature

A-testsuiteArea: The testsuite used to check the correctness of rustcArea: The testsuite used to check the correctness of rustc

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

rollupA PR which is a rollupA PR which is a rollup

S-waiting-on-borsStatus: Waiting on bors to run and complete tests. Bors will change the label on completion.Status: Waiting on bors to run and complete tests. Bors will change the label on completion.

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

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-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.

T-releaseRelevant to the release subteam, which will review and decide on the PR/issue.Relevant to the release subteam, which will review and decide on the PR/issue.

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

T-rustdoc-frontendRelevant to the rustdoc-frontend team, which will review and decide on the web UI/UX output.Relevant to the rustdoc-frontend team, which will review and decide on the web UI/UX output.

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

Status: Open (in progress).

rust-lang/rustnumber 145691

#145691 In rust-lang/rust;

· jhpratt opened on Aug 21, 2025

Implement Integer funnel shifts

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

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-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: Open (in progress).

rust-lang/rustnumber 145690

#145690 In rust-lang/rust;

· sayantn opened on Aug 20, 2025

Migrate <code>panic_unwind</code> to use <code>cfg_select!</code>

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

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: Open (in progress).

rust-lang/rustnumber 145689

#145689 In rust-lang/rust;

· cuviper opened on Aug 20, 2025

add std::os::fd::CommandExt::fd

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

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: Open (in progress).

rust-lang/rustnumber 145687

#145687 In rust-lang/rust;

· Qelxiros opened on Aug 20, 2025

add CopyFromClone and Cell::get_cloned

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

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: Open (in progress).

rust-lang/rustnumber 145685

#145685 In rust-lang/rust;

· Qelxiros opened on Aug 20, 2025

[DRAFT] Add ub_checks for downcast_unchecked

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

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: Open (in progress).

rust-lang/rustnumber 145684

#145684 In rust-lang/rust;

· Techcable opened on Aug 20, 2025

Fix typo in docstring

S-waiting-on-borsStatus: Waiting on bors to run and complete tests. Bors will change the label on completion.Status: Waiting on bors to run and complete tests. Bors will change the label on completion.

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: Open (in progress).

rust-lang/rustnumber 145678

#145678 In rust-lang/rust;

· ttajakka opened on Aug 20, 2025

Add flock support for cygwin

S-waiting-on-borsStatus: Waiting on bors to run and complete tests. Bors will change the label on completion.Status: Waiting on bors to run and complete tests. Bors will change the label on completion.

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: Open (in progress).

rust-lang/rustnumber 145673

#145673 In rust-lang/rust;

· Berrysoft opened on Aug 20, 2025

Don't require <code>T: RefUnwindSafe</code> for <code>vec::IntoIter&lt;T&gt;: UnwindSafe</code>

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

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: Open (in progress).

rust-lang/rustnumber 145665

#145665 In rust-lang/rust;

· GrigorenkoPV opened on Aug 20, 2025

initial implementation of the darwin_objc unstable feature

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

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

A-tidyArea: The tidy toolArea: The tidy tool

O-appleOperating system: Apple (macOS, iOS, tvOS, visionOS, watchOS)Operating system: Apple (macOS, iOS, tvOS, visionOS, watchOS)

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-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-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: Open (in progress).

rust-lang/rustnumber 145660

#145660 In rust-lang/rust;

· jbatez opened on Aug 20, 2025

Fix some typos in LocalKey documentation

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

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: Open (in progress).

rust-lang/rustnumber 145633

#145633 In rust-lang/rust;

· qxzcode opened on Aug 19, 2025

[std][BTree] Fix behavior of <code>::append</code> to match documentation and <code>::insert</code>

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-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: Open (in progress).

rust-lang/rustnumber 145628

#145628 In rust-lang/rust;

· tinnamchoi opened on Aug 19, 2025