Cleaned up a few analyzer warnings

sky/sdk/lib/widgets/widget.dart

Index: sky/sdk/lib/widgets/widget.dart
diff --git a/sky/sdk/lib/widgets/widget.dart b/sky/sdk/lib/widgets/widget.dart
index 7d450c98b11bdc330f7d7a1c48fb41004364fb4f..8381fc51befa12af6fe0dea18cb47244435266ce 100644
--- a/sky/sdk/lib/widgets/widget.dart
+++ b/sky/sdk/lib/widgets/widget.dart
@@ -109,7 +109,8 @@ abstract class Widget {
   // Returns the child which should be retained as the child of this node.
   Widget syncChild(Widget node, Widget oldNode, dynamic slot) {
 
-    assert(oldNode is! Component || !oldNode._disqualifiedFromEverAppearingAgain);
+    assert(oldNode is! Component || 
+        !(oldNode as Component)._disqualifiedFromEverAppearingAgain);

[Hixie, 2015/06/17 17:11:17]

this warning is a bug in the analyzer, you should leave it as it was.

[hansmuller, 2015/06/17 17:35:39]

Done.

 
     if (node == oldNode) {
       assert(node == null || node.mounted);