#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::ptr;
fn main() {
    let mut x = [1, 2, 3, 4];
    let mut y = [7, 8, 9];
    unsafe {
        ptr::swap_nonoverlapping(x.as_mut_ptr(), y.as_mut_ptr(), 2);
    }
    assert_eq!(x, [7, 8, 3, 4]);
    assert_eq!(y, [1, 2, 9]);
}