#![allow(unused_variables)]
fn main() {
    use std::sync::Arc;
    let five = Arc::new(5);
    unsafe {
        let ptr = Arc::into_raw(five);
        Arc::increment_strong_count(ptr);
        let five = Arc::from_raw(ptr);
        assert_eq!(2, Arc::strong_count(& five));
        Arc::decrement_strong_count(ptr);
        assert_eq!(1, Arc::strong_count(& five));
    }
}