#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let a = [1, 2, 3];
    let mut iter = a.into_iter().rev();
    assert_eq!(iter.next(), Some(3));
    assert_eq!(iter.next(), Some(2));
    assert_eq!(iter.next(), Some(1));
    assert_eq!(iter.next(), None);
}