#![allow(unused_variables)]
fn main() {
    use std::collections::LinkedList;
    let mut list: LinkedList<u32> = LinkedList::new();
    list.push_back(0);
    list.push_back(1);
    list.push_back(2);
    assert_eq!(list.contains(& 0), true);
    assert_eq!(list.contains(& 10), false);
}