#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let u = [10, 40, 30];
    assert_eq!(Some(& [10, 40]), u.first_chunk::< 2 > ());
    let v: &[i32] = &[10];
    assert_eq!(None, v.first_chunk::< 2 > ());
    let w: &[i32] = &[];
    assert_eq!(Some(& []), w.first_chunk::< 0 > ());
}