#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let mut x = Some(2);
    let y = x.take();
    assert_eq!(x, None);
    assert_eq!(y, Some(2));
    let mut x: Option<u32> = None;
    let y = x.take();
    assert_eq!(x, None);
    assert_eq!(y, None);
}