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futures-timer 0.2.1

Timeouts and intervals for futures.
Documentation 
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#![feature(async_await)]

use std::error::Error;
use std::time::{Duration, Instant};

use futures_timer::Delay;

#[runtime::test]
async fn smoke() -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
    let dur = Duration::from_millis(10);
    let start = Instant::now();
    Delay::new(dur).await?;
    assert!(start.elapsed() >= (dur / 2));
    Ok(())
}

#[runtime::test]
async fn two() -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
    let dur = Duration::from_millis(10);
    Delay::new(dur).await?;
    Delay::new(dur).await?;
    Ok(())
}