Address more bot-redness.

tests/lib/async/event_helper.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library event_helper;
 
 import 'dart:async';
 
 abstract class Event {
   void replay(EventSink sink);
 }
 
 class DataEvent implements Event {
   final data;
 
   DataEvent(this.data);
 
   void replay(EventSink sink) { sink.add(data); }
 
   int get hashCode => data.hashCode;
 
   bool operator==(Object other) {
     if (other is! DataEvent) return false;
     DataEvent otherEvent = other;
-    return data == other.data;
+    return data == otherEvent.data;
   }
 
   String toString() => "DataEvent: $data";
 }
 
 class ErrorEvent implements Event {
   final error;
 
   ErrorEvent(this.error);
 
   void replay(EventSink sink) { sink.addError(error); }
 
   int get hashCode => error.error.hashCode;
 
   bool operator==(Object other) {
     if (other is! ErrorEvent) return false;
     ErrorEvent otherEvent = other;
-    return error == other.error;
+    return error == otherEvent.error;
   }
 
   String toString() => "ErrorEvent: ${error}";
 }
 
 class DoneEvent implements Event {
   const DoneEvent();
 
   void replay(EventSink sink) { sink.close(); }
 
@@ skipping 115 matching lines @@
   void resume() {
     if (trace) print("Events#$hashCode: resume");
     subscription.resume();
   }
 
   void onDone(void action()) {
     if (trace) print("Events#$hashCode: onDone");
     onDoneSignal.future.whenComplete(action);
   }
 }