Fix warnings in library-tests.

tests/lib/async/stream_transformer_test.dart

Index: tests/lib/async/stream_transformer_test.dart
diff --git a/tests/lib/async/stream_transformer_test.dart b/tests/lib/async/stream_transformer_test.dart
index 8029a65cc7089a3cc7a6e3f9dd45b937a4651ca2..04ca2b0e67ddbd4591e0d5dddaba94325abf9919 100644
--- a/tests/lib/async/stream_transformer_test.dart
+++ b/tests/lib/async/stream_transformer_test.dart
@@ -21,7 +21,7 @@ class MyStreamSubscription<T> implements StreamSubscription<T> {
 
   MyStreamSubscription(this.stream, this.cancelOnError);
 
-  void cancel() {}
+  Future cancel() {}

[Lasse Reichstein Nielsen, 2013/11/01 09:37:36]

Change it to '=> null;', just to be sure.

It should be a warning to not return a value from a function with a non-void
return type. Even if we maybe haven't made it one yet.

[floitsch, 2013/11/01 16:57:25]

Done.

   void onData(void handleData(T data)) {
     this.handleData = handleData == null ? _defaultData: handleData;
   }
@@ -33,6 +33,8 @@ class MyStreamSubscription<T> implements StreamSubscription<T> {
   }
 
   void pause([Future resumeSignal]) {}
+  void resume() {}
+
   final isPaused = false;
   Future asFuture([var futureValue]) => null;
 }