c++17_steveklabnik_excerpt_tt.rs

fn main() {
    let opt = Opt::from_args();

    if let Err(err) = run(&opt) {
        eprintln!("error: {}", err);
        std::process::exit(1);  
    }
}

// ->

#![feature(termination_trait)]
extern crate failure;
use failure::Error as FailureError;

type Result<T> = std::result::Result<(), FailureError>

fn main() -> Result<()> {
    let opt = Opt::from_args();
    run(&opt)
}

8 lines of logic -> 4 (or 3 with run(&Opt::from_args)).