#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::mem::MaybeUninit;
fn main() {
    let mut x = MaybeUninit::<Vec<u8>>::uninit();
    {
        let hello = x.write((&b"Hello, world!").to_vec());
        *hello = (&b"Hello").to_vec();
        hello[0] = 'h' as u8;
    }
    let s = unsafe { x.assume_init() };
    assert_eq!(b"hello", s.as_slice());
}