main() {
    let x: u64;
    let y: u64;
    x = 0;
    y = 0;
    while (true) {
        loop {
            y = 5;
            break;
        }
        x = 3;
        break;
    }
    assert(move(x) == 3, 42);
    assert(move(y) == 5, 42);
    return;
}