#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let mut slice1 = [0, 0];
    let mut slice2 = [1, 2, 3, 4];
    slice1.swap_with_slice(&mut slice2[2..]);
    assert_eq!(slice1, [3, 4]);
    assert_eq!(slice2, [1, 2, 0, 0]);
}