#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![allow(unused_must_use)]
use std::mem;
use std::pin::Pin;
fn main() {
    let mut string = "this".to_string();
    let mut pinned_string = Pin::new(&mut string);
    mem::replace(&mut *pinned_string, "other".to_string());
}