//# run
main() {
    let x: u64;
    let x_ref: &mut u64;
    let imm_ref: &u64;
label b0:
    x = 5;
    x_ref = &mut x;
    // freeze type checks correctly
    imm_ref = freeze(move(x_ref));
    _ = move(imm_ref);

    return;
}