#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(duration_constructors)]
use std::time::Duration;
fn main() {
    let duration = Duration::from_weeks(4);
    assert_eq!(4 * 7 * 24 * 60 * 60, duration.as_secs());
    assert_eq!(0, duration.subsec_nanos());
}