#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let x = &mut [0, 1, 2];
    if let Some((first, elements)) = x.split_first_chunk_mut::<2>() {
        first[0] = 3;
        first[1] = 4;
        elements[0] = 5;
    }
    assert_eq!(x, & [3, 4, 5]);
    assert_eq!(None, x.split_first_chunk_mut::< 4 > ());
}