clap 3.0.0

A simple to use, efficient, and full-featured Command Line Argument Parser
Documentation 
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use clap::{app_from_crate, arg};

fn main() {
    let matches = app_from_crate!()
        .arg(arg!([NAME]).default_value("alice"))
        .get_matches();

    println!(
        "NAME: {:?}",
        matches
            .value_of("NAME")
            .expect("default ensures there is always a value")
    );
}