#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let s = "Löwe 老虎 Léopard";
    unsafe {
        assert_eq!("Löwe 老虎 Léopard", s.slice_unchecked(0, 21));
    }
    let s = "Hello, world!";
    unsafe {
        assert_eq!("world", s.slice_unchecked(7, 12));
    }
}