#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(slice_ptr_get)]
use std::ptr::NonNull;
fn main() {
    let x = &mut [1, 2, 4];
    let x = NonNull::slice_from_raw_parts(
        NonNull::new(x.as_mut_ptr()).unwrap(),
        x.len(),
    );
    unsafe {
        assert_eq!(x.get_unchecked_mut(1).as_ptr(), x.as_non_null_ptr().as_ptr().add(1));
    }
}