#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::ptr;
fn main() {
    let mut array = [0, 1, 2, 3];
    let (x, y) = array.split_at_mut(2);
    let x = x.as_mut_ptr().cast::<[u32; 2]>();
    let y = y.as_mut_ptr().cast::<[u32; 2]>();
    unsafe {
        ptr::swap(x, y);
        assert_eq!([2, 3, 0, 1], array);
    }
}