#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::ptr::NonNull;
fn main() {
    let mut x = 0u32;
    let ptr = NonNull::new(&mut x).expect("ptr is null!");
    let x_value = unsafe { *ptr.as_ptr() };
    assert_eq!(x_value, 0);
    unsafe {
        *ptr.as_ptr() += 2;
    }
    let x_value = unsafe { *ptr.as_ptr() };
    assert_eq!(x_value, 2);
}