#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let n = 0b01001100u8;
    assert_eq!(n.count_ones(), 3);
    let max = u8::MAX;
    assert_eq!(max.count_ones(), 8);
    let zero = 0u8;
    assert_eq!(zero.count_ones(), 0);
}