#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(slice_partition_dedup)]
fn main() {
    let mut slice = ["foo", "Foo", "BAZ", "Bar", "bar", "baz", "BAZ"];
    let (dedup, duplicates) = slice.partition_dedup_by(|a, b| a.eq_ignore_ascii_case(b));
    assert_eq!(dedup, ["foo", "BAZ", "Bar", "baz"]);
    assert_eq!(duplicates, ["bar", "Foo", "BAZ"]);
}