#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let x = &[1, 2, 4];
    let mut iterator = x.iter();
    assert_eq!(iterator.next(), Some(& 1));
    assert_eq!(iterator.next(), Some(& 2));
    assert_eq!(iterator.next(), Some(& 4));
    assert_eq!(iterator.next(), None);
}