Configuring Clippy
Note: The configuration file is unstable and may be deprecated in the future.
Some lints can be configured in a TOML file named clippy.toml
or .clippy.toml
. It contains a
basic variable = value
mapping eg.
avoid-breaking-exported-api = false
disallowed-names = ["toto", "tata", "titi"]
cognitive-complexity-threshold = 30
See the list of lints for more information about which lints can be configured and the meaning of the variables.
To deactivate the "for further information visit lint-link" message you can define the CLIPPY_DISABLE_DOCS_LINKS
environment variable.
Allowing/denying lints
You can add options to your code to allow
/warn
/deny
Clippy lints:
-
the whole set of
Warn
lints using theclippy
lint group (#![deny(clippy::all)]
) -
all lints using both the
clippy
andclippy::pedantic
lint groups (#![deny(clippy::all)]
,#![deny(clippy::pedantic)]
). Note thatclippy::pedantic
contains some very aggressive lints prone to false positives. -
only some lints (
#![deny(clippy::single_match, clippy::box_vec)]
, etc.) -
allow
/warn
/deny
can be limited to a single function or module using#[allow(...)]
, etc.
Note: allow
means to suppress the lint for your code. With warn
the lint will only emit a warning, while with deny
the lint will emit an error, when triggering for your code. An error causes clippy to exit with an error code, so is
useful in scripts like CI/CD.
If you do not want to include your lint levels in your code, you can globally enable/disable lints by passing extra flags to Clippy during the run:
To allow lint_name
, run
cargo clippy -- -A clippy::lint_name
And to warn on lint_name
, run
cargo clippy -- -W clippy::lint_name
This also works with lint groups. For example you can run Clippy with warnings for all lints enabled:
cargo clippy -- -W clippy::pedantic
If you care only about a single lint, you can allow all others and then explicitly warn on the lint(s) you are interested in:
cargo clippy -- -A clippy::all -W clippy::useless_format -W clippy::...
Specifying the minimum supported Rust version
Projects that intend to support old versions of Rust can disable lints pertaining to newer features by specifying the minimum supported Rust version (MSRV) in the clippy configuration file.
msrv = "1.30.0"
The MSRV can also be specified as an inner attribute, like below.
#![feature(custom_inner_attributes)] #![clippy::msrv = "1.30.0"] fn main() { ... }
You can also omit the patch version when specifying the MSRV, so msrv = 1.30
is equivalent to msrv = 1.30.0
.
Note: custom_inner_attributes
is an unstable feature so it has to be enabled explicitly.
Lints that recognize this configuration option can be found here