clap/clap_derive/examples/at_least_two.rs

//! How to require presence of at least N values,
//! like `val1 val2 ... valN ... valM`.

use clap::Clap;

#[derive(Clap, Debug)]
struct Opt {
    #[clap(required = true, min_values = 2)]
    foos: Vec<String>,
}

fn main() {
    let opt = Opt::parse();
    println!("{:?}", opt);
}