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Consolidate panicking functions in <code>slice/index.rs</code>

perf-regressionPerformance regression.Performance regression.

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-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 145137

#145137 In rust-lang/rust;

· Kmeakin opened on Aug 8, 2025

[WIP] Add downcast_trait and downcast_trait_mut

S-waiting-on-authorStatus: This is awaiting some action (such as code changes or more information) from the author.Status: This is awaiting some action (such as code changes or more information) from the author.

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: Draft (not ready).

rust-lang/rustnumber 144363

#144363 In rust-lang/rust;

· ivarflakstad opened on Jul 23, 2025

dirfd: preliminary unix and windows implementations

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.

O-windowsOperating system: WindowsOperating system: Windows

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 139514

#139514 In rust-lang/rust;

· Qelxiros opened on Apr 8, 2025

Explicitly export core and std macros

S-waiting-on-authorStatus: This is awaiting some action (such as code changes or more information) from the author.Status: This is awaiting some action (such as code changes or more information) from the author.

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-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.

Status: Open (in progress).

rust-lang/rustnumber 139493

#139493 In rust-lang/rust;

· Voultapher opened on Apr 7, 2025

Add <code>Duration::from_nanos_u128</code>

O-unixOperating system: Unix-likeOperating system: Unix-like

S-waiting-on-authorStatus: This is awaiting some action (such as code changes or more information) from the author.Status: This is awaiting some action (such as code changes or more information) from the author.

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.

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 139243

#139243 In rust-lang/rust;

· omanirudh opened on Apr 2, 2025

Add <code>__isPlatformVersionAtLeast</code> and <code>__isOSVersionAtLeast</code> symbols

A-linkageArea: linking into static, shared libraries and binariesArea: linking into static, shared libraries and binaries

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

A-run-makeArea: port run-make Makefiles to rmake.rsArea: port run-make Makefiles to rmake.rs

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-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 138944

#138944 In rust-lang/rust;

· madsmtm opened on Mar 25, 2025

Implement RFC 3631: add rustdoc doc_cfg features

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

A-run-makeArea: port run-make Makefiles to rmake.rsArea: port run-make Makefiles to rmake.rs

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.

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.

Status: Open (in progress).

rust-lang/rustnumber 138907

#138907 In rust-lang/rust;

· GuillaumeGomez opened on Mar 24, 2025

Reserve before <code>write_fmt</code> for owned buffers

perf-regressionPerformance regression.Performance regression.

S-waiting-on-authorStatus: This is awaiting some action (such as code changes or more information) from the author.Status: This is awaiting some action (such as code changes or more information) from the author.

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 137762

#137762 In rust-lang/rust;

· thaliaarchi opened on Feb 28, 2025

Document <code>From::from</code> impls

A-docsArea: Documentation for any part of the project, including the compiler, standard library, and toolsArea: Documentation for any part of the project, including the compiler, standard library, and tools

C-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.

O-linuxOperating system: LinuxOperating system: Linux

O-solidOperating System: SOLIDOperating System: SOLID

O-unixOperating system: Unix-likeOperating system: Unix-like

O-windowsOperating system: WindowsOperating system: Windows

S-waiting-on-authorStatus: This is awaiting some action (such as code changes or more information) from the author.Status: This is awaiting some action (such as code changes or more information) from the author.

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 137330

#137330 In rust-lang/rust;

· TimTheBig opened on Feb 20, 2025

Specialize <code>Iterator::eq{_by}</code> for <code>TrustedLen</code> iterators

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-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 137122

#137122 In rust-lang/rust;

· yotamofek opened on Feb 16, 2025

Rewrite UTF-8 validation in shift-based DFA for 70%~135% performance increase on non-ASCII strings

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 136693

#136693 In rust-lang/rust;

· oxalica opened on Feb 7, 2025

Add contracts for all functions in <code>Alignment</code>

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

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 136578

#136578 In rust-lang/rust;

· tautschnig opened on Feb 5, 2025