#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let data: &mut [_] = &mut [2, 10, 5, 8];
    data.sort_by(|a, b| a.cmp(b).reverse());
    let b: &mut [_] = &mut [10, 8, 5, 2];
    assert!(data == b);
}