#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::mem::{self, MaybeUninit};
fn main() {
    let data = {
        let mut data: [MaybeUninit<Vec<u32>>; 1000] = [const {
            MaybeUninit::uninit()
        }; 1000];
        for elem in &mut data[..] {
            elem.write(vec![42]);
        }
        unsafe { mem::transmute::<_, [Vec<u32>; 1000]>(data) }
    };
    assert_eq!(& data[0], & [42]);
}