#![allow(unused_variables)]
fn main() {
    use std::collections::VecDeque;
    let mut buf = VecDeque::new();
    buf.push_back(2);
    buf.push_back(1);
    buf.push_front(3);
    buf.make_contiguous();
    if let (slice, &[]) = buf.as_slices() {
        assert_eq!(buf.len(), slice.len());
        assert_eq!(slice, & [3, 2, 1] as & [_]);
    }
}