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Auto merge of #5371 - matthiaskrgr:rdm, r=phansch

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readme: explain how to run only a single lint on a codebase

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@ -90,6 +90,14 @@ Note that this is still experimental and only supported on the nightly channel:
cargo fix -Z unstable-options --clippy
```
#### Running only a single lint
If you care only about the warnings of a single lint and want to ignore everything else, you
can first deny all the clippy lints and then explicitly enable the lint(s) you care about:
````
cargo clippy -- -Aclippy::all -Wclippy::useless_format
````
### Running Clippy from the command line without installing it
To have cargo compile your crate with Clippy without Clippy installation