#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(maybe_uninit_write_slice)]
use std::mem::MaybeUninit;
fn main() {
    let mut dst = [MaybeUninit::uninit(); 32];
    let src = [0; 32];
    let init = dst.write_copy_of_slice(&src);
    assert_eq!(init, src);
}