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