#![allow(unused_variables)]
fn main() {
    use std::mem;
    unsafe {
        let s = String::from("hello");
        let mut s = mem::ManuallyDrop::new(s);
        let ptr = s.as_mut_ptr();
        let len = s.len();
        let capacity = s.capacity();
        let s = String::from_raw_parts(ptr, len, capacity);
        assert_eq!(String::from("hello"), s);
    }
}