#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::iter::zip;
fn main() {
    let xs = [1, 2, 3];
    let ys = [4, 5, 6];
    let mut iter = zip(xs, ys);
    assert_eq!(iter.next().unwrap(), (1, 4));
    assert_eq!(iter.next().unwrap(), (2, 5));
    assert_eq!(iter.next().unwrap(), (3, 6));
    assert!(iter.next().is_none());
    let zs = [7, 8, 9];
    let mut iter = zip(zip(xs, ys), zs);
    assert_eq!(iter.next().unwrap(), ((1, 4), 7));
    assert_eq!(iter.next().unwrap(), ((2, 5), 8));
    assert_eq!(iter.next().unwrap(), ((3, 6), 9));
    assert!(iter.next().is_none());
}