#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::num::NonZero;
fn main() {
    test().unwrap();
}
fn test() -> Option<()> {
    let pos_five = NonZero::new(5i8)?;
    let neg_five = NonZero::new(-5i8)?;
    let min = NonZero::new(i8::MIN)?;
    assert_eq!(pos_five.checked_neg(), Some(neg_five));
    assert_eq!(min.checked_neg(), None);
    Some(())
}