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structopt 0.3.1

Parse command line argument by defining a struct.
Documentation 
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use structopt::StructOpt;

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

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