use std::time::{Duration, Instant};
use tokio::prelude::*;
use tokio::timer::Delay;

fn main() {
    let when = Instant::now() + Duration::from_millis(4000);
    let task = Delay::new(when)
        .and_then(|_| {
            println!("Hello world!");
            Ok(())
        })
        .map_err(|e| panic!("delay errored; err={:?}", e));

    let future_with_timeout = task
        .timeout(Duration::from_millis(3000))
        .map_err(|e| println!("Timeout hit {:?}", e));
    let _ = future_with_timeout.wait().expect("Failure");
    // tokio::run(future_with_timeout);
}