impl FusedStream for Fuse

src/stream/stream/fuse.rs

@@ -31,3 +31,9 @@ impl<S: futures_core::Stream> futures_core::Stream for Fuse<S> {
         }
     }
 }
+
+impl<S: futures_core::Stream> futures_core::stream::FusedStream for Fuse<S> {
+    fn is_terminated(&self) -> bool {
+        self.done
+    }
+}