#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(slice_partition_dedup)]
fn main() {
    let mut slice = [1, 2, 2, 3, 3, 2, 1, 1];
    let (dedup, duplicates) = slice.partition_dedup();
    assert_eq!(dedup, [1, 2, 3, 2, 1]);
    assert_eq!(duplicates, [2, 3, 1]);
}