#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(int_lowest_highest_one)]
fn main() {
    assert_eq!(0x0_u8.lowest_one(), None);
    assert_eq!(0x1_u8.lowest_one(), Some(0));
    assert_eq!(0x10_u8.lowest_one(), Some(4));
    assert_eq!(0x1f_u8.lowest_one(), Some(0));
}