#![allow(unused_variables)]
fn main() {
    use std::sync::Arc;
    let x = Arc::new("hello".to_owned());
    let y = Arc::clone(&x);
    let x_ptr = Arc::as_ptr(&x);
    assert_eq!(x_ptr, Arc::as_ptr(& y));
    assert_eq!(unsafe { &* x_ptr }, "hello");
}