#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(nonzero_ops)]
use std::num::NonZero;
fn main() {
    test().unwrap();
}
fn test() -> Option<()> {
    let two = NonZero::new(2u8)?;
    let four = NonZero::new(4u8)?;
    assert_eq!(four, unsafe { two.unchecked_mul(two) });
    Some(())
}