#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::sync::atomic::{self, AtomicPtr};
fn main() {
    let ptr: *mut *mut u8 = Box::into_raw(Box::new(std::ptr::null_mut()));
    assert!(ptr.cast::< AtomicPtr < u8 >> ().is_aligned());
    {
        let atomic = unsafe { AtomicPtr::from_ptr(ptr) };
        atomic.store(std::ptr::NonNull::dangling().as_ptr(), atomic::Ordering::Relaxed);
    }
    assert!(! unsafe { * ptr } .is_null());
    unsafe { drop(Box::from_raw(ptr)) }
}