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[DO NOT MERGE] bootstrap with <code>-Znext-solver=globally</code>

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

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

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

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

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

perf-regressionPerformance regression.Performance regression.

PG-exploit-mitigationsProject group: Exploit mitigationsProject group: Exploit mitigations

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-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-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.

WG-trait-system-refactorThe Rustc Trait System Refactor Initiative (-Znext-solver)The Rustc Trait System Refactor Initiative (-Znext-solver)

Status: Draft (not ready).

rust-lang/rustnumber 133502

#133502 In rust-lang/rust;

· lcnr opened on Nov 26, 2024

sess: default to v0 symbol mangling

perf-regressionPerformance regression.Performance regression.

PG-exploit-mitigationsProject group: Exploit mitigationsProject group: Exploit mitigations

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 (in progress).

rust-lang/rustnumber 89917

#89917 In rust-lang/rust;

· davidtwco opened on Oct 15, 2021

Add range metadata to slice lengths

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-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 116542

#116542 In rust-lang/rust;

· the8472 opened on Oct 8, 2023

Implement RFC 3349, mixed utf8 literals

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

perf-regressionPerformance regression.Performance regression.

perf-regression-triagedThe performance regression has been triaged.The performance regression has been 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)

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-langRelevant to the language teamRelevant to the language team

Status: Draft (not ready).

rust-lang/rustnumber 120286

#120286 In rust-lang/rust;

· nnethercote opened on Jan 23, 2024

Enable DestinationPropagation by default

A-mir-optArea: MIR optimizationsArea: MIR optimizations

perf-regressionPerformance regression.Performance regression.

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.

Status: Open (in progress).

rust-lang/rustnumber 142915

#142915 In rust-lang/rust;

· cjgillot opened on Jun 23, 2025

MIR: Stop needing an explicit BB for <code>otherwise:unreachable</code>

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-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 124188

#124188 In rust-lang/rust;

· scottmcm opened on Apr 20, 2024

Keep space if arg does not follow punctuation when lint unused parens

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-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 138271

#138271 In rust-lang/rust;

· mu001999 opened on Mar 9, 2025

Create the previous dep graph index on a background thread

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

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-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 116375

#116375 In rust-lang/rust;

· Zoxc opened on Oct 3, 2023

Dogfood <code>-Zno-embed-metadata</code> in the compiler

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

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)

Status: Draft (not ready).

rust-lang/rustnumber 145343

#145343 In rust-lang/rust;

· Kobzol opened on Aug 13, 2025

Regression on MIR queries

A-MIRArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.htmlArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html

perf-regressionPerformance regression.Performance regression.

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.

#99473 In rust-lang/rust;

· Dylan-DPC opened on Jul 19, 2022

Performance regression with <code>get_many_mut()</code>

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

I-heavyIssue: Problems and improvements with respect to binary size of generated code.Issue: Problems and improvements with respect to binary size of generated code.

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

P-mediumMedium priorityMedium priority

perf-regressionPerformance regression.Performance regression.

regression-from-stable-to-stablePerformance or correctness regression from one stable version to another.Performance or correctness regression from one stable version to another.

Status: Open.

#128214 In rust-lang/rust;

· ChayimFriedman2 opened on Jul 25, 2024

· 

1.81.0

100% CPU usage when running doc tests

A-doctestsArea: Documentation tests, run by rustdocArea: Documentation tests, run by rustdoc

C-bugCategory: This is a bug.Category: This is a bug.

I-compiletimeIssue: Problems and improvements with respect to compile times.Issue: Problems and improvements with respect to compile times.

perf-regressionPerformance regression.Performance regression.

regression-untriagedUntriaged performance or correctness regression.Untriaged performance or correctness regression.

S-needs-reproStatus: This issue has no reproduction and needs a reproduction to make progress.Status: This issue has no reproduction and needs a reproduction to make progress.

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.

Status: Open.

#128538 In rust-lang/rust;

· tingerrr opened on Aug 2, 2024