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Code coverage reports wrong count of loop header

A-code-coverageArea: Source-based code coverage (-Cinstrument-coverage)Area: Source-based code coverage (-Cinstrument-coverage)

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

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.

#151554 In rust-lang/rust;

· pmur opened on Jan 23, 2026

LLVM 23 changes sort order of coverage mapping

A-code-coverageArea: Source-based code coverage (-Cinstrument-coverage)Area: Source-based code coverage (-Cinstrument-coverage)

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.

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.

#151419 In rust-lang/rust;

· durin42 opened on Jan 20, 2026

async closures are incorrectly marked as not covered

A-code-coverageArea: Source-based code coverage (-Cinstrument-coverage)Area: Source-based code coverage (-Cinstrument-coverage)

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

Status: Open.

#151135 In rust-lang/rust;

· lukaslihotzki-f opened on Jan 14, 2026

[aarch64-pc-windows-msvc] Coverage instrumentation produces malformed profile

A-code-coverageArea: Source-based code coverage (-Cinstrument-coverage)Area: Source-based code coverage (-Cinstrument-coverage)

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

O-aarch64-pc-windows-msvcTarget: aarch64-pc-windows-msvcTarget: aarch64-pc-windows-msvc

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.

#150123 In rust-lang/rust;

· vadimpiven opened on Dec 18, 2025

Coverage behavioral changes on #[derive] lines

A-code-coverageArea: Source-based code coverage (-Cinstrument-coverage)Area: Source-based code coverage (-Cinstrument-coverage)

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

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

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.

#147434 In rust-lang/rust;

· reaperhulk opened on Oct 7, 2025

ICE: <code>span context mismatch</code>

A-code-coverageArea: Source-based code coverage (-Cinstrument-coverage)Area: Source-based code coverage (-Cinstrument-coverage)

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

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

requires-debug-assertionsThis issue requires a build of rustc or tooling with debug-assertions in some wayThis issue requires a build of rustc or tooling with debug-assertions in some way

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.

#147339 In rust-lang/rust;

· matthiaskrgr opened on Oct 4, 2025

profiler_builtins compiled failed when I try to get the test coverage of std\core\alloc

A-code-coverageArea: Source-based code coverage (-Cinstrument-coverage)Area: Source-based code coverage (-Cinstrument-coverage)

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

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.

#144299 In rust-lang/rust;

· surechen opened on Jul 22, 2025

Coverage tests produce invalid executables on x86_64-pc-windows-gnu

A-code-coverageArea: Source-based code coverage (-Cinstrument-coverage)Area: Source-based code coverage (-Cinstrument-coverage)

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

O-windows-gnuToolchain: GNU, Operating system: WindowsToolchain: GNU, Operating system: Windows

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.

#144046 In rust-lang/rust;

· ForrestOfBarnes opened on Jul 17, 2025

missing coverage on aarch64 with -C opt-level=3

A-code-coverageArea: Source-based code coverage (-Cinstrument-coverage)Area: Source-based code coverage (-Cinstrument-coverage)

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

O-AArch64Armv8-A or later processors in AArch64 modeArmv8-A or later processors in AArch64 mode

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.

#143892 In rust-lang/rust;

· arielb1 opened on Jul 13, 2025

code coverage reporting for <code>let-else</code> interacts poorly with rustfmt

A-code-coverageArea: Source-based code coverage (-Cinstrument-coverage)Area: Source-based code coverage (-Cinstrument-coverage)

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

F-let_elseIssues related to let-else statements (RFC 3137)Issues related to let-else statements (RFC 3137)

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.

#143149 In rust-lang/rust;

· briansmith opened on Jun 28, 2025

Rust Coverage not working if macros are formatted across multiple lines

A-code-coverageArea: Source-based code coverage (-Cinstrument-coverage)Area: Source-based code coverage (-Cinstrument-coverage)

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

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-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.

#142291 In rust-lang/rust;

· Ryang20718 opened on Jun 10, 2025

SIGILL when compiling <code>cc</code> with <code>-C instrument-coverage</code> <code>-Z coverage-options=mcdc</code>

A-code-coverageArea: Source-based code coverage (-Cinstrument-coverage)Area: Source-based code coverage (-Cinstrument-coverage)

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

E-needs-mcveCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable ExampleCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example

F-coverage-mcdcMC/DC coverage via -Cinstrument-coverage with -Zcoverage-options=mcdcMC/DC coverage via -Cinstrument-coverage with -Zcoverage-options=mcdc

requires-nightlyThis issue requires a nightly compiler in some way. When possible, use a F-* label instead.This issue requires a nightly compiler in some way. When possible, use a F-* label instead.

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.

#140677 In rust-lang/rust;

· esarver opened on May 5, 2025