Zero warnings from the analyzer!

sky/sdk/lib/widgets/ink_well.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import 'dart:math' as math;
 import 'dart:sky' as sky;
 
 import '../animation/animated_value.dart';
 import '../animation/curves.dart';
 import '../rendering/box.dart';
@@ skipping 47 matching lines @@
     canvas.drawCircle(position.x, position.y, _radius.value, paint);
   }
 }
 
 class RenderInkWell extends RenderProxyBox {
   RenderInkWell({ RenderBox child }) : super(child);
 
   final List<InkSplash> _splashes = new List<InkSplash>();
 
   void handleEvent(sky.Event event, BoxHitTestEntry entry) {
-    switch (event.type) {
-      case 'gesturetapdown':
-        // TODO(abarth): We should position the splash at the location of the tap.
-        _startSplash(event.primaryPointer, entry.localPosition);
-        break;
-      case 'gesturetap':
-        _confirmSplash(event.primaryPointer);
-        break;
+    if (event is sky.GestureEvent) {
+      switch (event.type) {
+        case 'gesturetapdown':
+          _startSplash(event.primaryPointer, entry.localPosition);
+          break;
+        case 'gesturetap':
+          _confirmSplash(event.primaryPointer);
+          break;
+      }
     }
   }
 
   void _startSplash(int pointer, Point position) {
     _splashes.add(new InkSplash(pointer, position, this));
     markNeedsPaint();
   }
 
   void _confirmSplash(int pointer) {
     _splashes.where((splash) => splash.pointer == pointer)
@@ skipping 13 matching lines @@
   }
 }
 
 class InkWell extends OneChildRenderObjectWrapper {
   InkWell({ String key, Widget child })
     : super(key: key, child: child);
 
   RenderInkWell get root => super.root;
   RenderInkWell createNode() => new RenderInkWell();
 }