// check: VerificationError
// check: MoveLocUnavailableError

main() {
    let x: u64;
    let y: u64;
    let b: bool;
    x = 0;
    b = true;
    while (copy(b)) {
        y = move(x);
        b = false;
    }
    assert(move(y) == 0, 42);
    return;
}