Tool for formatting Rust source code. More information: <https://github.com/rust-lang/rustfmt>.

• Format a file, overwriting the original file in-place:
  rustfmt path/to/source.rs
• Check a file for formatting and display any changes on the console:
  rustfmt --check path/to/source.rs
• Backup any modified files before formatting (the original file is renamed with a `.bk` extension):
  rustfmt --backup path/to/source.rs

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