use futures::Stream;

fn main() -> Result<(), Box<std::error::Error>> {
    let matches = Box::new(clap::App::new("foo")
        .arg(clap::Arg::with_name("FILE").multiple(true).required(true))
        .get_matches_from(vec!["foo", "a", "b", "c"]));
    let matches = Box::leak(matches);

    let files = matches.values_of("FILE").unwrap();

    let stream = futures::stream::iter_ok::<_, ()>(files)
        .for_each(|x| {
            println!("x: {}", x);
            futures::future::ok(())
        });

    tokio::run(stream);

    Ok(())
}