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