structopt 0.2.6

Parse command line argument by defining a struct.
Documentation 
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#[macro_use]
extern crate structopt;

use structopt::StructOpt;

#[derive(StructOpt, Debug)]
struct Opt {
    #[structopt(raw(required = "true", min_values = "2"))]
    foos: Vec<String>,
}

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