rust-clippy/book/src/README.md

Clippy

A collection of lints to catch common mistakes and improve your Rust code.

There are over 550 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/deny
clippy::correctness	code that is outright wrong or useless	deny
clippy::suspicious	code that is most likely wrong or useless	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::style	code that should be written in a more idiomatic way	warn
clippy::pedantic	lints which are rather strict or might have false positives	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 lint list also contains "restriction lints", which are for things which are usually not considered "bad", but may be useful to turn on in specific cases. These should be used very selectively, if at all.