#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let a = [0i32, 1, 2];
    let mut iter = a.into_iter().filter(|x| x.is_positive());
    assert_eq!(iter.next(), Some(1));
    assert_eq!(iter.next(), Some(2));
    assert_eq!(iter.next(), None);
}