Lint and format Rust code with cargo clippy and cargo fmt (including CI gates)
domain: doc.rust-lang.org · 6 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Both tools ship as rustup components; install if missing: `rustup component add clippy rustfmt`.
`cargo clippy` runs the linter over the crate. Auto-apply machine-fixable suggestions with `cargo clippy --fix`.
CI gate: `cargo clippy -- -D warnings` turns every warning into an error so the build fails on any lint.
`cargo fmt` rewrites all source files to standard style in place; `cargo fmt --check` reports diffs and exits nonzero without modifying files — use this form in CI.
Configure rustfmt via rustfmt.toml at the project root; configure clippy lint levels in Cargo.toml [lints.clippy] or via attributes.
Docs: https://doc.rust-lang.org/clippy/ and https://rust-lang.github.io/rustfmt/
Known gotchas
`cargo fmt --check` is a flag of cargo-fmt itself (no `--` needed), while `-D warnings` must go after `--` because it is passed through to the compiler/clippy driver.
clippy caches results: after a clean `cargo clippy` run, re-running shows no warnings until code changes; use `cargo clean -p <crate>` or touch files to force re-lint.
cargo fmt rewrites files in place — commit or stash before running it the first time on a legacy codebase.
Many rustfmt options documented online are nightly-only; stable rustfmt silently accepts but ignores some of them, so verify behavior with `--check` in CI.
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