rust/src/test/run-pass/iter-contains.rs

fn main() {
    assert []/_.contains(22u) == false;
    assert [1u, 3u]/_.contains(22u) == false;
    assert [22u, 1u, 3u]/_.contains(22u) == true;
    assert [1u, 22u, 3u]/_.contains(22u) == true;
    assert [1u, 3u, 22u]/_.contains(22u) == true;
    assert None.contains(22u) == false;
    assert Some(1u).contains(22u) == false;
    assert Some(22u).contains(22u) == true;
}