#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(iter_intersperse)]
#[derive(PartialEq, Debug)]
struct NotClone(usize);
fn main() {
    let v = [NotClone(0), NotClone(1), NotClone(2)];
    let mut it = v.into_iter().intersperse_with(|| NotClone(99));
    assert_eq!(it.next(), Some(NotClone(0)));
    assert_eq!(it.next(), Some(NotClone(99)));
    assert_eq!(it.next(), Some(NotClone(1)));
    assert_eq!(it.next(), Some(NotClone(99)));
    assert_eq!(it.next(), Some(NotClone(2)));
    assert_eq!(it.next(), None);
}