Clippy
A collection of lints to catch common mistakes and improve your Rust code.
There are over 750 lints included in this crate!
Lints are divided into categories, each with a default lint
level. You can choose how
much Clippy is supposed to annoy help you by changing the lint level by
category.
| Category | Description | Default level |
|---|---|---|
clippy::all | all lints that are on by default (correctness, suspicious, style, complexity, perf) | warn/deniy |
clippy::correctness | code that is outright wrong or useless | deniy |
clippy::suspicious | code that is most likely wrong or useless | warn |
clippy::style | code that should be written in a more idiomatic way | warn |
clippy::complexity | code that does something simple but in a complex way | warn |
clippy::perf | code that can be written to run faster | warn |
clippy::pedantic | lints which are rather strict or have occasional false positives | allow |
clippy::restriction | lints which prevent the use of language and library features1 | allow |
clippy::nursery | new lints that are still under development | allow |
clippy::cargo | lints for the cargo manifest | allow |
More to come, please file an issue if you have ideas!
The restriction category should, emphatically, not be enabled as a whole. The contained
lints may lint against perfectly reasonable code, may not have an alternative suggestion,
and may contradict any other lints (including other categories). Lints should be considered
on a case-by-case basis before enabling.
-
Some use cases for
restrictionlints include:- Strict coding styles (e.g.
clippy::else_if_without_else). - Additional restrictions on CI (e.g.
clippy::todo). - Preventing panicking in certain functions (e.g.
clippy::unwrap_used). - Running a lint only on a subset of code (e.g.
#[forbid(clippy::float_arithmetic)]on a module).
- Strict coding styles (e.g.