Clippy

What it does

Automatic fixes

`cargo clippy --fix` can automatically apply some lint suggestions and implies `--all-targets`.checked 9 Oct 2026

CI use

Clippy's documentation recommends running it in CI with warnings treated as errors.checked 9 Oct 2026

Configurable levels

Users can change lint levels by category, and the default lint group includes correctness, suspicious, style, complexity, and performance lints.checked 8 Oct 2026

Configuration

Lint levels can be changed on the command line or in source code, and Clippy supports configuration through `clippy.toml`.checked 9 Oct 2026

Continuous integration

The documentation recommends running Clippy in CI with warnings treated as errors and using Clippy from the same toolchain as the project compiler.checked 8 Oct 2026

False positives

The pedantic lint group is described as strict and as allowing occasional false positives.checked 9 Oct 2026

GitHub Actions

The documentation says GitHub-hosted runners with the latest stable Rust have Clippy preinstalled.checked 9 Oct 2026

How to run

Clippy runs as the `cargo clippy` subcommand or directly through `clippy-driver`.checked 9 Oct 2026

Installation

Clippy is usually included with rustup toolchains and can be added with `rustup component add clippy`; the minimal profile does not install it automatically.checked 9 Oct 2026

License

The Clippy repository is licensed under either Apache License 2.0 or MIT, at the licensee's option.checked 9 Oct 2026

Lint categories

Lint groups include correctness, suspicious, style, complexity, performance, pedantic, restriction, nursery, and Cargo.checked 9 Oct 2026

Lint configuration

Some lint settings can be configured in clippy.toml or .clippy.toml, and the documentation says this configuration file is unstable and may be deprecated.checked 8 Oct 2026

Lint count

The lint list contains 837 lints.checked 9 Oct 2026

Notable limitation

The documentation warns that restriction lints may flag reasonable code, lack an alternative suggestion, or contradict other lints, and advises against enabling the whole category.checked 9 Oct 2026

Purpose

Clippy is a collection of lints that catches common mistakes and improves Rust code.checked 9 Oct 2026

Restriction limits

The documentation advises against enabling the entire restriction lint category because its lints may flag reasonable code, lack alternatives, or conflict with other lints.checked 8 Oct 2026

Rust version support

Projects can configure a minimum supported Rust version so Clippy can adjust or suppress lints involving newer language features.checked 8 Oct 2026

Suggestion confidence

Clippy suggestions carry applicability information because some suggestions may be incorrect and need human supervision.checked 8 Oct 2026

Support

The Clippy contribution guide directs people with questions to GitHub issues or the #t-clippy Zulip stream.checked 9 Oct 2026

Ways to run

Clippy can run as a Cargo subcommand or directly through the clippy-driver binary.checked 8 Oct 2026

Workspace support

Clippy supports Cargo workspace options, including selecting a package and using --no-deps.checked 8 Oct 2026