- Split into `src/lib.rs` and `src/main.rs`
- Return `Result<(), &'static str>` from `src/lib.rs`
- Replace `expect` with `&str` error messages
- Catch application errors in `src/main.rs`
- Print to `stderr` and exit with code `1`
- Bump version
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src/lib.rsandsrc/main.rsResult<(), &'static str>fromsrc/lib.rsexpectwith&strerror messagessrc/main.rsstderrand exit with code1