2022-06-16 15:39:06 +00:00
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# Clippy
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[](https://github.com/rust-lang/rust-clippy/actions?query=workflow%3A%22Clippy+Test%22+event%3Apush+branch%3Aauto)
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[](#license)
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A collection of lints to catch common mistakes and improve your
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[Rust](https://github.com/rust-lang/rust) code.
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2022-06-30 08:50:09 +00:00
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[There are over 550 lints included in this crate!](https://rust-lang.github.io/rust-clippy/master/index.html)
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2022-06-16 15:39:06 +00:00
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Lints are divided into categories, each with a default [lint
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level](https://doc.rust-lang.org/rustc/lints/levels.html). You can choose how
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much Clippy is supposed to ~~annoy~~ help you by changing the lint level by
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category.
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| Category | Description | Default level |
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| --------------------- | ----------------------------------------------------------------------------------- | ------------- |
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| `clippy::all` | all lints that are on by default (correctness, suspicious, style, complexity, perf) | **warn/deny** |
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| `clippy::correctness` | code that is outright wrong or useless | **deny** |
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| `clippy::suspicious` | code that is most likely wrong or useless | **warn** |
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| `clippy::complexity` | code that does something simple but in a complex way | **warn** |
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| `clippy::perf` | code that can be written to run faster | **warn** |
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| `clippy::style` | code that should be written in a more idiomatic way | **warn** |
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| `clippy::pedantic` | lints which are rather strict or might have false positives | allow |
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| `clippy::nursery` | new lints that are still under development | allow |
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| `clippy::cargo` | lints for the cargo manifest | allow | | allow |
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More to come, please [file an
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issue](https://github.com/rust-lang/rust-clippy/issues) if you have ideas!
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The [lint list](https://rust-lang.github.io/rust-clippy/master/index.html) also
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contains "restriction lints", which are for things which are usually not
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considered "bad", but may be useful to turn on in specific cases. These should
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be used very selectively, if at all.
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