#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::ptr;
fn main() {
    let mut s = String::from("foo");
    unsafe {
        let mut s2: String = ptr::read(&s);
        assert_eq!(s2, "foo");
        s2 = String::default();
        assert_eq!(s2, "");
        ptr::write(&mut s, String::from("bar"));
    }
    assert_eq!(s, "bar");
}