v24.5.0

• Fixed: Follow path attributes on mod statements.

• New: --build-timeout and --build-timeout-multiplier options for setting timeouts for the build and check cargo phases.

• Changed: --timeout-multiplier now overrides timeout_multiplier from .cargo/mutants.toml.

• Changed: --timeout and --timeout-multiplier are now conflicting options.

v24.4.0

• New: Generate mutations that delete the ! and - unary operators.

• Changed: Baselines and mutants are now built with cargo test --no-run rather than cargo build --tests as previously. This avoids wasted build effort if the dev and test Cargo profiles are not the same, and may better distinguish build failures from test failures. With --test-tool=nextest, the corresponding cargo nextest run --no-run is used.

• Fixed: .ignore files can no longer affect source tree copying, so test files listed in a .ignore (e.g. *.snap for Insta snapshots) are now correctly copied into temporary build directories.

• Fixed: Don't visit files marked with #![cfg(test)] (or other inner attributes that generally cause code to be skipped.)

• Fixed: Paths to module files nested within mod blocks are now correctly resolved.

• Added: Document stability policy in the manual.

v24.3.0

Download cargo-mutants 24.3.0

File	Platform	Checksum
cargo-mutants-aarch64-apple-darwin.tar.xz	Apple Silicon macOS	checksum
cargo-mutants-x86_64-apple-darwin.tar.xz	Intel macOS	checksum
cargo-mutants-x86_64-pc-windows-msvc.zip	x64 Windows	checksum
cargo-mutants-x86_64-unknown-linux-gnu.tar.xz	x64 Linux	checksum

v24.2.1

• New: --features, --no-default-features and --all-features options are passed through to Cargo.

• Changed: Minimum Rust version (to build cargo-mutants, not to use it) increased to 1.73.

• New: Warn if nextest returns an exit code indicating some failure other than test failure, such as an internal error in nextest.

• New: json output includes the exit code of subprocesses, and the signal if it was killed by a signal.

• Changed: Set INSTA_FORCE_PASS=0 (in addition to previously INSTA_UPDATE=no) when running tests, so that tests that use the Insta library don't write updates back into the source directory, and so don't falsely pass.

• New: --timeout-multiplier option allows setting the timeout for mutants to be a multiple of the baseline timeout, rather than a fixed time.

Install cargo-mutants 24.2.1

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/sourcefrog/cargo-mutants/releases/download/v24.2.1/cargo-mutants-installer.sh | sh

Install prebuilt binaries via powershell script

irm https://github.com/sourcefrog/cargo-mutants/releases/download/v24.2.1/cargo-mutants-installer.ps1 | iex

Download cargo-mutants 24.2.1

File	Platform	Checksum
cargo-mutants-aarch64-apple-darwin.tar.xz	Apple Silicon macOS	checksum
cargo-mutants-x86_64-apple-darwin.tar.xz	Intel macOS	checksum
cargo-mutants-x86_64-pc-windows-msvc.zip	x64 Windows	checksum
cargo-mutants-x86_64-unknown-linux-gnu.tar.xz	x64 Linux	checksum

v24.2.0

• New: Colored output can be enabled in CI or other noninteractive situations by passing --colors=always, or setting CARGO_TERM_COLOR=always, or CLICOLOR_FORCE=1. Colors can similarly be forced off with --colors=never, CARGO_TERM_COLOR=never, or NO_COLOR=1.

Install cargo-mutants 24.2.0

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/sourcefrog/cargo-mutants/releases/download/v24.2.0/cargo-mutants-installer.sh | sh

Install prebuilt binaries via powershell script

irm https://github.com/sourcefrog/cargo-mutants/releases/download/v24.2.0/cargo-mutants-installer.ps1 | iex

Download cargo-mutants 24.2.0

File	Platform	Checksum
cargo-mutants-aarch64-apple-darwin.tar.xz	Apple Silicon macOS	checksum
cargo-mutants-x86_64-apple-darwin.tar.xz	Intel macOS	checksum
cargo-mutants-x86_64-pc-windows-msvc.zip	x64 Windows	checksum
cargo-mutants-x86_64-unknown-linux-gnu.tar.xz	x64 Linux	checksum

v24.1.2

• New: --in-place option tests mutations in the original source tree, without copying the tree. This is faster and uses less disk space, but it's incompatible with --jobs, and you must be careful not to edit or commit the source tree while tests are running.

---

Install cargo-mutants 24.1.2

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/sourcefrog/cargo-mutants/releases/download/v24.1.2/cargo-mutants-installer.sh | sh

Install prebuilt binaries via powershell script

irm https://github.com/sourcefrog/cargo-mutants/releases/download/v24.1.2/cargo-mutants-installer.ps1 | iex

Download cargo-mutants 24.1.2

File	Platform	Checksum
cargo-mutants-aarch64-apple-darwin.tar.xz	macOS Apple Silicon	checksum
cargo-mutants-x86_64-apple-darwin.tar.xz	macOS Intel	checksum
cargo-mutants-x86_64-pc-windows-msvc.zip	Windows x64	checksum
cargo-mutants-x86_64-unknown-linux-gnu.tar.xz	Linux x64	checksum

v24.1.1

cargo-mutants 24.1.1

• New: Mutate +, -, *, /, %, &, ^, |, <<, >> binary ops, and their corresponding assignment ops like +=.

• New: --baseline=skip option to skip running tests in an unmutated tree, when they're already been checked externally.

• Changed: Stop generating mutations of || and && to != and ||, because it seems to raise too many low-value false positives that may be hard to test.

• Fixed: Colors in command-line help and error messages.

---

Install cargo-mutants 24.1.1

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/sourcefrog/cargo-mutants/releases/download/v24.1.1/cargo-mutants-installer.sh | sh

Install prebuilt binaries via powershell script

irm https://github.com/sourcefrog/cargo-mutants/releases/download/v24.1.1/cargo-mutants-installer.ps1 | iex

Download cargo-mutants 24.1.1

File	Platform	Checksum
cargo-mutants-aarch64-apple-darwin.tar.xz	macOS Apple Silicon	checksum
cargo-mutants-x86_64-apple-darwin.tar.xz	macOS Intel	checksum
cargo-mutants-x86_64-pc-windows-msvc.zip	Windows x64	checksum
cargo-mutants-x86_64-unknown-linux-gnu.tar.xz	Linux x64	checksum

v24.1.0

• New! cargo mutants --test-tool nextest, or test_tool = "nextest" in .cargo/mutants.toml runs tests under Nextest. Some trees have tests that only work under Nextest, and this allows them to be tested. In other cases Nextest may be significantly faster, because it will exit soon after the first test failure.

• Fixed: Fixed spurious "Patch input contains repeated filenames" error when --in-diff is given a patch that deletes multiple files.

Download through cargo install, cargo binstall or https://github.com/sourcefrog/cargo-mutants/releases/tag/v24.1.0

---

Install cargo-mutants 24.1.0

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/sourcefrog/cargo-mutants/releases/download/v24.1.0/cargo-mutants-installer.sh | sh

Install prebuilt binaries via powershell script

irm https://github.com/sourcefrog/cargo-mutants/releases/download/v24.1.0/cargo-mutants-installer.ps1 | iex

Download cargo-mutants 24.1.0

File	Platform	Checksum
cargo-mutants-aarch64-apple-darwin.tar.xz	macOS Apple Silicon	checksum
cargo-mutants-x86_64-apple-darwin.tar.xz	macOS Intel	checksum
cargo-mutants-x86_64-pc-windows-msvc.zip	Windows x64	checksum
cargo-mutants-x86_64-unknown-linux-gnu.tar.xz	Linux x64	checksum

v23.12.2

Install cargo-mutants 23.12.2

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/sourcefrog/cargo-mutants/releases/download/v23.12.2/cargo-mutants-installer.sh | sh

Install prebuilt binaries via powershell script

irm https://github.com/sourcefrog/cargo-mutants/releases/download/v23.12.2/cargo-mutants-installer.ps1 | iex

Download cargo-mutants 23.12.2

File	Platform	Checksum
cargo-mutants-aarch64-apple-darwin.tar.xz	macOS Apple Silicon	checksum
cargo-mutants-x86_64-apple-darwin.tar.xz	macOS Intel	checksum
cargo-mutants-x86_64-pc-windows-msvc.zip	Windows x64	checksum
cargo-mutants-x86_64-unknown-linux-gnu.tar.xz	Linux x64	checksum

23.12.1 tropical mutants

• Improved progress bars and console output, including putting the outcome of each mutant on the left, and the overall progress bar at the bottom. Improved display of estimated remaining time, and other times.

• Fixed: Correctly traverse mod statements within package top source files that are not named lib.rs or main.rs, by following the path setting of each target within the manifest.

• Improved: Don't generate function mutants that have the same AST as the code they're replacing.