//# run
main() {
    let x: u64;
    let x_ref: &mut u64;
    let dead: u64;
label b0:
    x = 5;
    x_ref = &mut x;
    assert(*copy(x_ref) == 5, 42);
    dead = move(x); // cannot move x, still borrowed
    *move(x_ref) = 42;
    return;
}