quick_error_primer

io-context.rs

#[macro_use] extern crate quick_error;
quick_error! {
    #[derive(Debug)]
    pub enum SomeError {
        Io(err: io::Error, path: PathBuf) {
            display("I/O error at {path}: {err}", err=err, path=path)
            description(err.description())
        }
        ApplicationError
    }
}

quick-error-simple-example.rs

#[macro_use] extern crate quick_error;
quick_error! {
    #[derive(Debug)]
    pub enum SomeError {
        Io(err: io::Error) {
            from()
            display("I/O error: {}", err)
            description(err.description())
        }
        ApplicationError
    }
}