#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(duration_from_nanos_u128)]
use std::time::Duration;
fn main() {
    let nanos = 10_u128.pow(24) + 321;
    let duration = Duration::from_nanos_u128(nanos);
    assert_eq!(10_u64.pow(15), duration.as_secs());
    assert_eq!(321, duration.subsec_nanos());
}