#![allow(unused_variables)]
#![feature(unique_rc_arc)]
fn main() {
    use std::sync::{Arc, Weak, UniqueArc};
    struct Gadget {
        me: Weak<Gadget>,
    }
    fn create_gadget() -> Option<Arc<Gadget>> {
        let mut rc = UniqueArc::new(Gadget { me: Weak::new() });
        rc.me = UniqueArc::downgrade(&rc);
        Some(UniqueArc::into_arc(rc))
    }
    create_gadget().unwrap();
}