#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let slice = ['r', 'u', 's', 't'];
    let mut iter = slice.windows(2);
    assert_eq!(iter.next(), Some(& ['r', 'u'] [..]));
    assert_eq!(iter.next(), Some(& ['u', 's'] [..]));
    assert_eq!(iter.next(), Some(& ['s', 't'] [..]));
    assert_eq!(iter.next(), None);
}