#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(once_cell_get_mut)]
use std::cell::OnceCell;
fn main() {
    let mut cell = OnceCell::new();
    let value = cell.get_mut_or_init(|| 92);
    assert_eq!(* value, 92);
    *value += 2;
    assert_eq!(* value, 94);
    let value = cell.get_mut_or_init(|| unreachable!());
    assert_eq!(* value, 94);
}