#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let mut slice: &mut [_] = &mut ['a', 'b', 'c', 'd'];
    assert_eq!(None, slice.split_off_mut(5..));
    assert_eq!(None, slice.split_off_mut(..5));
    assert_eq!(None, slice.split_off_mut(..= 4));
    let expected: &mut [_] = &mut ['a', 'b', 'c', 'd'];
    assert_eq!(Some(expected), slice.split_off_mut(..4));
}