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cargo-llvm-cov

Cargo subcommand to easily use LLVM source-based code coverage (-Z instrument-coverage).

  • tool
  • CLI
  • TESTING
  • COVERAGE
  • Launchable
  • Runs in terminal
official+codex · reviewed · May 27, 2026 description in en

Description

Runs LLVM source-based code coverage for Rust projects through Cargo. It helps developers see which lines, branches, or regions are exercised by tests.

Use it to guide test improvements and regression coverage. Coverage numbers are useful signals, but they do not prove behavior is correct or edge cases are fully tested.

How to run

cargo llvm-cov

Commands: cargo llvm-cov

Permissions

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