#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let mut slice: &[_] = &['a', 'b', 'c', 'd'];
    let mut first_three = slice.split_off(..3).unwrap();
    assert_eq!(slice, & ['d']);
    assert_eq!(first_three, & ['a', 'b', 'c']);
}