10 pub enum MaybeDone<Fut: Future> {  enum
21 impl<Fut: Future + Unpin> Unpin for MaybeDone<Fut> {}  implementation
24 pub fn maybe_done<Fut: Future>(future: Fut) -> MaybeDone<Fut> {  in maybe_done()
25     MaybeDone::Future(future)  in maybe_done()
28 impl<Fut: Future> MaybeDone<Fut> {  implementation
37                 MaybeDone::Done(res) => Some(res),  in output_mut()
50                 MaybeDone::Done(_) => {}  in take_output()
51                 MaybeDone::Future(_) | MaybeDone::Gone => return None,  in take_output()
53             if let MaybeDone::Done(output) = mem::replace(this, MaybeDone::Gone) {  in take_output()
62 impl<Fut: Future> Future for MaybeDone<Fut> {  implementation
68                 MaybeDone::Future(a) => ready!(Pin::new_unchecked(a).poll(cx)),  in poll()
69                 MaybeDone::Done(_) => return Poll::Ready(()),  in poll()
70                 MaybeDone::Gone => panic!("MaybeDone polled after value taken"),  in poll()
73         self.set(MaybeDone::Done(res));  in poll()