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## Summary
I found that `cargo benchmark lexer` didn't work as expected:
```shell
❯ cargo benchmark lexer
Finished bench [optimized] target(s) in 0.08s
Running benches/formatter.rs (target/release/deps/formatter-4e1d9bf9d3ba529d)
Running benches/linter.rs (target/release/deps/linter-e449086ddfd8ad8c)
```
Turns out that `cargo bench -p ruff_benchmark` is now recommended over
`cargo benchmark`, so updating the docs to reflect that.
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Ruff Benchmarks
The ruff_benchmark crate benchmarks the linter and the formatter on individual files:
# Run once on the "baseline".
cargo bench -p ruff_benchmark -- --save-baseline=main
# Compare against the "baseline".
cargo bench -p ruff_benchmark -- --baseline=main
# Run the lexer benchmarks.
cargo bench -p ruff_benchmark lexer -- --baseline=main
See CONTRIBUTING.md on how to use these benchmarks.