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

Relevant to the compiler team, which will review and decide on the PR/issue.

T-libs

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

T-rustfmt

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

[experimental, do not merge!] a faster implementation of Polonius and a more compact DenseBitSet implementation A-compiletest

The Rustc Trait System Refactor Initiative (-Znext-solver)

#148313 opened Oct 31, 2025 by eholk • Draft

😕

Area: The compiletest test runner

Area: The testsuite used to check the correctness of rustc

perf-regression

Performance regression.

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

Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

[DO NOT MERGE] build Enzyme as archive A-testsuite

Relevant to the compiler team, which will review and decide on the PR/issue.

#141583 opened May 26, 2025 by tage64 • Draft

Area: The testsuite used to check the correctness of rustc

F-autodiff

`#![feature(autodiff)]`

perf-regression

Performance regression.

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

Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

Relevant to the compiler team, which will review and decide on the PR/issue.

compiler: Stop manually extending the stack A-query-system

Relevant to the infrastructure team, which will review and decide on the PR/issue.

#140799 opened May 8, 2025 by ZuseZ4

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Area: The rustc query system (https://rustc-dev-guide.rust-lang.org/query.html)

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

Relevant to the compiler team, which will review and decide on the PR/issue.

Swap Lru from std::sync::Arc to triomphe::Arc A-query-system

The Rustc Trait System Refactor Initiative (-Znext-solver)

#134153 opened Dec 10, 2024 by workingjubilee • Draft

Area: The rustc query system (https://rustc-dev-guide.rust-lang.org/query.html)

Area: The testsuite used to check the correctness of rustc

perf-regression

Performance regression.

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

Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

turn creating 8dot3 names off for windows for speed A-testsuite

Relevant to the compiler team, which will review and decide on the PR/issue.

#131629 opened Oct 12, 2024 by GnomedDev • Draft

Area: The testsuite used to check the correctness of rustc

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

Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

Lazy-chunk Symbol interner perf-regression

Relevant to the infrastructure team, which will review and decide on the PR/issue.

#133033 opened Nov 14, 2024 by klensy

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Performance regression.

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

Use multiple returns in MIR if it saves a block; still have only one in LLVM perf-regression

Relevant to the compiler team, which will review and decide on the PR/issue.

#136401 opened Feb 1, 2025 by Mark-Simulacrum • Draft

Performance regression.

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

[perf] Fast path for coercions of TY == TY T-compiler

Relevant to the compiler team, which will review and decide on the PR/issue.

#138144 opened Mar 7, 2025 by scottmcm • Draft

Relevant to the compiler team, which will review and decide on the PR/issue.

#142973 opened Jun 24, 2025 by compiler-errors • Draft

Check for occupied niches perf-regression

Performance regression.

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

[experiment] dont init anything except x86 perf-regression

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T-libs

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

#121174 opened Feb 16, 2024 by saethlin • Draft

Performance regression.

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

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

MIR: Stop needing an explicit BB for otherwise:unreachable perf-regression

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#136861 opened Feb 11, 2025 by klensy

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Performance regression.

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

Omit suggestions when spans are invalid A-compiletest

Relevant to the compiler team, which will review and decide on the PR/issue.

#124188 opened Apr 20, 2024 by scottmcm • Draft

Area: The compiletest test runner

Area: The testsuite used to check the correctness of rustc

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

Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

Stabilize return type notation (RFC 3654) disposition-merge

Relevant to the compiler team, which will review and decide on the PR/issue.

#147849 opened Oct 18, 2025 by jdonszelmann

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This issue / PR is in PFCP or FCP with a disposition to merge it.

I-lang-radar

Items that are on lang's radar and will need eventual work or consideration.

proposed-final-comment-period

Proposed to merge/close by relevant subteam, see T-<team> label. Will enter FCP once signed off.

S-waiting-on-documentation

Status: Waiting on approved PRs to documentation before merging

Split marking and visit to compute live_symbols. perf-regression

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

T-lang

Relevant to the language team

T-types

Relevant to the types team, which will review and decide on the PR/issue.

#138424 opened Mar 12, 2025 by compiler-errors

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1 of 4 tasks

Performance regression.

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

Dummy PR to test coverage test changes in CI A-LLVM

Relevant to the compiler team, which will review and decide on the PR/issue.

#114538 opened Aug 6, 2023 by cjgillot • Draft

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

A-run-make

Area: port run-make Makefiles to rmake.rs

Area: The testsuite used to check the correctness of rustc

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

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

Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

[DO NOT MERGE] Experimentally force non-leaf frame pointers perf-regression

Relevant to the infrastructure team, which will review and decide on the PR/issue.

#114917 opened Aug 17, 2023 by Zalathar • Draft

Performance regression.

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

Don't check GAT bounds in normalization S-blocked

Relevant to the compiler team, which will review and decide on the PR/issue.

#115521 opened Sep 3, 2023 by workingjubilee

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

T-types

Relevant to the types team, which will review and decide on the PR/issue.

#117682 opened Nov 7, 2023 by aliemjay • Draft

[perf] test MCP510 A-compiletest

Area: The compiletest test runner

A-query-system

Area: The rustc query system (https://rustc-dev-guide.rust-lang.org/query.html)

A-rustdoc-json

Area: Rustdoc JSON backend

Area: The testsuite used to check the correctness of rustc

A-tidy

Area: The tidy tool

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

Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

Relevant to the compiler team, which will review and decide on the PR/issue.

Relevant to the infrastructure team, which will review and decide on the PR/issue.

#113382 opened Jul 5, 2023 by lqd • Draft

475

[do not merge] CI experiments A-CI

Area: Our Github Actions CI

A-compiletest

Area: The compiletest test runner

A-LLVM

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

A-meta

Area: Issues & PRs about the rust-lang/rust repository itself

A-query-system

Area: The rustc query system (https://rustc-dev-guide.rust-lang.org/query.html)

Area: The testsuite used to check the correctness of rustc

A-tidy

Area: The tidy tool

A-translation

Area: Translation infrastructure, and migrating existing diagnostics to SessionDiagnostic

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

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

Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

Relevant to the infrastructure team, which will review and decide on the PR/issue.

Fix for pattern types causing ICE in debuginfo generation A-LLVM

The Rustc Trait System Refactor Initiative (-Znext-solver)

#112049 opened May 28, 2023 by Kobzol • Draft

1859

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

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

Do not copy rustc rlibs into the sysroot of the build compiler A-bootstrap-stamp

Relevant to the compiler team, which will review and decide on the PR/issue.

#145716 opened Aug 21, 2025 by notJoon • Draft

Area: bootstrap stamp logic

Area: The testsuite used to check the correctness of rustc

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

Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

#146203 opened Sep 4, 2025 by Kobzol • Draft

Offload device2 A-LLVM

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

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

Relevant to the compiler team, which will review and decide on the PR/issue.

#145688 opened Aug 20, 2025 by ZuseZ4 • Draft

rustdoc: [PoC] [WIP] Don't render keyword Self as SelfTy A-attributes

Area: Attributes (`#[…]`, `#![…]`)

A-rustdoc-json

Area: Rustdoc JSON backend

A-rustdoc-search

Area: Rustdoc's search feature

rla-silenced

Silences rust-log-analyzer postings to the PR it's added on.

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

[WIP]: Resolve type relative type/const-generic paths in trait solving S-waiting-on-author

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

T-rustdoc

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

T-rustdoc-frontend

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

#145806 opened Aug 24, 2025 by fmease • Draft

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

Relevant to the compiler team, which will review and decide on the PR/issue.