#![allow(unused_variables)]
fn main() {
    use std::sync::Arc;
    use std::ptr;
    let strong = Arc::new("hello".to_owned());
    let weak = Arc::downgrade(&strong);
    assert!(ptr::eq(&* strong, weak.as_ptr()));
    assert_eq!("hello", unsafe { &* weak.as_ptr() });
    drop(strong);
}