tldr/pages/common/rustfmt.md

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# rustfmt
> Tool for formatting Rust source code.
> Homepage: <https://github.com/rust-lang/rustfmt>.
- Format a file, overwriting the original file in-place:
`rustfmt {{source.rs}}`
- Check a file for formatting and display any changes on the console:
`rustfmt --check {{source.rs}}`
- Backup any modified files before formatting (the original file is renamed with a `.bk` extension):
`rustfmt --backup {{source.rs}}`