//# run
main() {
    let x: u64;
    let y: u64;
    let b: bool;
label b0:
    x = 0;
    b = true;
label while:
    jump_if_false (true) while_cont;
label while_b0:
    jump_if (copy(b)) while_b2;
label while_b1:
    x = move(y); // invalid move
    jump while_b3;
label while_b2:
    y = move(x);
label while_b3:
    b = false;
    jump while;
label while_cont:
    return;
}