#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let a = [-1i32, 4, 0, 1];
    let mut iter = a.into_iter().map_while(|x| 16i32.checked_div(x));
    assert_eq!(iter.next(), Some(- 16));
    assert_eq!(iter.next(), Some(4));
    assert_eq!(iter.next(), None);
}