#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(atomic_try_update)]
use std::sync::atomic::{AtomicPtr, Ordering};
fn main() {
    let ptr: *mut _ = &mut 5;
    let some_ptr = AtomicPtr::new(ptr);
    let new: *mut _ = &mut 10;
    let result = some_ptr.update(Ordering::SeqCst, Ordering::SeqCst, |_| new);
    assert_eq!(result, ptr);
    assert_eq!(some_ptr.load(Ordering::SeqCst), new);
}