#![allow(unused_variables)]
fn main() {
    use std::collections::VecDeque;
    let deque: VecDeque<_> = [0, 1, 1, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55].into();
    assert_eq!(deque.binary_search_by(| x | x.cmp(& 13)), Ok(9));
    assert_eq!(deque.binary_search_by(| x | x.cmp(& 4)), Err(7));
    assert_eq!(deque.binary_search_by(| x | x.cmp(& 100)), Err(13));
    let r = deque.binary_search_by(|x| x.cmp(&1));
    assert!(matches!(r, Ok(1..= 4)));
}