#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::ptr;
fn main() {
    let mut array: [i32; 4] = [0, 1, 2, 3];
    let array_ptr: *mut i32 = array.as_mut_ptr();
    let x = array_ptr as *mut [i32; 3];
    let y = unsafe { array_ptr.add(1) } as *mut [i32; 3];
    unsafe {
        ptr::swap(x, y);
        assert_eq!([1, 0, 1, 2], array);
    }
}