Provoking a deadlock in Rust

deadlock.rs

fn make_deadlock() {
    let a = Arc::new(Mutex::new(1u32));
    let aa = Arc::clone(&a);
    let b = Arc::new(Mutex::new(1u32));
    let bb = Arc::clone(&b);

    let t_a = spawn(move || loop {
        do_locking("A".to_string(), "a".to_string(), &*a, "b".to_string(), &*b);
    });

    let t_b = spawn(move || loop {
        do_locking(
            "B".to_string(),
            "b".to_string(),
            &*bb,
            "a".to_string(),
            &*aa,
        );
    });

    t_a.join().unwrap();
    t_b.join().unwrap();
}

fn do_locking(name: String, a_name: String, a: &Mutex<u32>, b_name: String, b: &Mutex<u32>) {
    println!("{} wants to lock {}.", name, a_name);
    let a_lock = a.lock().unwrap();
    println!(
        "{} has lock for {} and now wants to lock {}.",
        name, a_name, b_name
    );
    let b_lock = b.lock().unwrap();
    println!("{} got that lock too.", name);
}