Add type info to fix analyzer failure, missed this one change in previous cl

lib/src/util/stream_queue.dart

Index: lib/src/util/stream_queue.dart
diff --git a/lib/src/util/stream_queue.dart b/lib/src/util/stream_queue.dart
index c37c2ca05d8072d780ae917ce0c70c9bfa930f6a..5b2ac97038ab7635ff6eaaa2292bde6dbd3ccf0c 100644
--- a/lib/src/util/stream_queue.dart
+++ b/lib/src/util/stream_queue.dart
@@ -439,7 +439,7 @@ class _NextRequest<T> implements _EventRequest {
   }
 
   void close(Queue<Result> events) {
-    var errorFuture =
+    Future<T> errorFuture =
         new Future.sync(() => throw new StateError("No elements"));

[kevmoo, 2017/03/14 19:04:01]

Instead of this, try doing `new Future<T>.sync` – it's cleaner

[keertip, 2017/03/14 19:12:49]

Done.

     _completer.complete(errorFuture);
   }