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[perf] Fast path for coercions of TY == TY

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: Draft (not ready).

rust-lang/rustnumber 142973

#142973 In rust-lang/rust;

· compiler-errors opened on Jun 24, 2025

<code>proven_via</code> into query response

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.

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 142953

#142953 In rust-lang/rust;

· lcnr opened on Jun 24, 2025

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

Stop collecting unmentioned constants

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.

Status: Open (in progress).

rust-lang/rustnumber 142893

#142893 In rust-lang/rust;

· Mark-Simulacrum opened on Jun 22, 2025

MIR inliner maintains unused var_debug_info

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 142890

#142890 In rust-lang/rust;

· kornelski opened on Jun 22, 2025

JumpThreading: compute place and value indices on-demand

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 142881

#142881 In rust-lang/rust;

· cjgillot opened on Jun 22, 2025

Use <code>join_with_double_colon</code> in <code>write_shared.rs</code>.

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-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 142869

#142869 In rust-lang/rust;

· nnethercote opened on Jun 22, 2025

Stop backends from needing to support nullary intrinsics

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.

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 142839

#142839 In rust-lang/rust;

· oli-obk opened on Jun 21, 2025

Make lowering incremental, take 3/N

perf-regressionPerformance regression.Performance regression.

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

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-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: Draft (not ready).

rust-lang/rustnumber 142830

#142830 In rust-lang/rust;

· cjgillot opened on Jun 21, 2025

Compute jump threading opportunities in a single pass

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 142821

#142821 In rust-lang/rust;

· cjgillot opened on Jun 21, 2025

Introduce debuginfo to statements in MIR

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.

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.

S-waiting-on-perfStatus: Waiting on a perf run to be completed.Status: Waiting on a perf run to be completed.

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 142771

#142771 In rust-lang/rust;

· dianqk opened on Jun 20, 2025

lazily reevaluate nested goals

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.

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 142735

#142735 In rust-lang/rust;

· lcnr opened on Jun 19, 2025