gistfile1.txt

struct DropDebug<F : futures::Future> (F);
impl<F : futures::Future> futures::Stream for DropDebug<F> {
    type Item  = F::Item;
    type Error = F::Error;
    fn poll(&mut self) -> futures::Poll<Self::Item, Self::Error> {
        self.0.poll()
    }   
}   


error[E0053]: method `poll` has an incompatible type for trait
  --> src/server.rs:36:5
   |
36 |     fn poll(&mut self) -> futures::Poll<A, B> {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected enum `std::option::Option`, found type parameter
   |
   = note: expected type `fn(&mut DropDeadFuture<F>) -> std::result::Result<futures::Async<std::option::Option<_>>, _>`
              found type `fn(&mut DropDeadFuture<F>) -> std::result::Result<futures::Async<A>, B>`