#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let a = [0, 1, 2, 3, 4, 5];
    let mut iter = a.into_iter().step_by(2);
    assert_eq!(iter.next(), Some(0));
    assert_eq!(iter.next(), Some(2));
    assert_eq!(iter.next(), Some(4));
    assert_eq!(iter.next(), None);
}