#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(iter_intersperse)]
fn main() {
    let mut a = [0, 1, 2].into_iter().intersperse(100);
    assert_eq!(a.next(), Some(0));
    assert_eq!(a.next(), Some(100));
    assert_eq!(a.next(), Some(1));
    assert_eq!(a.next(), Some(100));
    assert_eq!(a.next(), Some(2));
    assert_eq!(a.next(), None);
}