#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let x = &mut [0, 1, 2];
    if let Some(last) = x.last_chunk_mut::<2>() {
        last[0] = 10;
        last[1] = 20;
    }
    assert_eq!(x, & [0, 10, 20]);
    assert_eq!(None, x.last_chunk_mut::< 4 > ());
}