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

A-tidyArea: The tidy toolArea: The tidy tool

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.

Status: Open (in progress).

rust-lang/rustnumber 148321

#148321 In rust-lang/rust;

· Marcondiro opened on Oct 31, 2025

remove support for <code>typeof</code>

A-tidyArea: The tidy toolArea: The tidy tool

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-MCPStatus: PR has a compiler MCP and is waiting for the compiler MCP to complete.Status: PR has a compiler MCP and is waiting for the compiler MCP to complete.

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.

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 148256

#148256 In rust-lang/rust;

· lcnr opened on Oct 29, 2025

[PERF] see if my fork of <code>stringdex</code> affects perf

A-tidyArea: The tidy toolArea: The tidy tool

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-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-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: Draft (not ready).

rust-lang/rustnumber 147918

#147918 In rust-lang/rust;

· yotamofek opened on Oct 20, 2025

Remove <code>box_new</code> intrinsic

A-rustc-dev-guideArea: rustc-dev-guideArea: rustc-dev-guide

A-tidyArea: The tidy toolArea: The tidy tool

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-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.

Status: Draft (not ready).

rust-lang/rustnumber 147862

#147862 In rust-lang/rust;

· cjgillot opened on Oct 18, 2025

compiletest: Use <code>//@</code> prefixes also for debuginfo test directives

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

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

A-tidyArea: The tidy toolArea: The tidy tool

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-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.

Status: Draft (not ready).

rust-lang/rustnumber 147799

#147799 In rust-lang/rust;

· Enselic opened on Oct 17, 2025

"./x.py test --verbose --no-fail-fast" causes tidy to fail

A-tidyArea: The tidy toolArea: The tidy tool

E-needs-investigationCall for partcipation: This issues needs some investigation to determine current statusCall for partcipation: This issues needs some investigation to determine current status

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

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)

Status: Open.

#147500 In rust-lang/rust;

· Zeckmathederg opened on Oct 8, 2025

std: move <code>kernel_copy</code> to <code>sys</code>

A-tidyArea: The tidy toolArea: The tidy tool

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

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-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 147077

#147077 In rust-lang/rust;

· joboet opened on Sep 26, 2025

[EXPERIMENT] Test 8-bit tags for hashbrown

A-tidyArea: The tidy toolArea: The tidy tool

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-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-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 146909

#146909 In rust-lang/rust;

· Amanieu opened on Sep 22, 2025

remove duplicated columns from <code>rustc_error_code::error_codes!</code>

A-tidyArea: The tidy toolArea: The tidy tool

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.

Status: Open (in progress).

rust-lang/rustnumber 146584

#146584 In rust-lang/rust;

· cyrgani opened on Sep 15, 2025

Weekly <code>cargo update</code> + update allowed dependencies list

A-tidyArea: The tidy toolArea: The tidy tool

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-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)

Status: Open (in progress).

rust-lang/rustnumber 145849

#145849 In rust-lang/rust;

· clubby789 opened on Aug 25, 2025

Migrate <code>unused-revision-names</code> check from tidy to compiletest

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

A-tidyArea: The tidy toolArea: The tidy tool

C-cleanupCategory: PRs that clean code up or issues documenting cleanup.Category: PRs that clean code up or issues documenting cleanup.

E-hardCall for participation: Hard difficulty. Experience needed to fix: A lot.Call for participation: Hard difficulty. Experience needed to fix: A lot.

S-blockedStatus: Blocked on something else such as an RFC or other implementation work.Status: Blocked on something else such as an RFC or other implementation work.

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.

Status: Open.

#144671 In rust-lang/rust;

· jieyouxu opened on Jul 30, 2025

Add debuginfo_transparent attribute for structs

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

A-debuginfoArea: Debugging information in compiled programs (DWARF, PDB, etc.)Area: Debugging information in compiled programs (DWARF, PDB, etc.)

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

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

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 144223

#144223 In rust-lang/rust;

· bjorn3 opened on Jul 20, 2025