#![allow(unused_variables)]
#![allow(dead_code)]
fn main() {
    use std::sync::{Arc, Weak};
    struct Gadget {
        me: Weak<Gadget>,
    }
    impl Gadget {
        /// Constructs a reference counted Gadget.
        fn new() -> Arc<Self> {
            Arc::new_cyclic(|me| { Gadget { me: me.clone() } })
        }
        /// Returns a reference counted pointer to Self.
        fn me(&self) -> Arc<Self> {
            self.me.upgrade().unwrap()
        }
    }
}