Can not find Element in Dynamic element.

compiler/java/com/google/dart/compiler/resolver/Elements.java

Index: compiler/java/com/google/dart/compiler/resolver/Elements.java
diff --git a/compiler/java/com/google/dart/compiler/resolver/Elements.java b/compiler/java/com/google/dart/compiler/resolver/Elements.java
index 08d2f3397e78df5fcee2606efdfcbfd5cdcf9bb8..f2fe6634f0150a3fc511bd22024f201f4daa23fb 100644
--- a/compiler/java/com/google/dart/compiler/resolver/Elements.java
+++ b/compiler/java/com/google/dart/compiler/resolver/Elements.java
@@ -111,7 +111,10 @@ public class Elements {
   }
 
   static Element findElement(ClassElement cls, String name) {
-    return ((ClassElementImplementation) cls).findElement(name);
+    if (cls instanceof ClassElementImplementation) {

[zundel, 2011/10/24 15:07:44]

I think rather than an instanceof test, the preferred way to handle this is to
find ElementKind.of(cls).  You'll want to test for ElementKind.CLASS.  I think
possibly a FUNCION_ALIAS might be passed in sometimes which you would want to
filter out.

[scheglov, 2011/10/24 19:57:55]

I'm not sure.
At first, we cast to this type, so it is just logical to test using instanceof.
At second, we would need to test not only for CLASS, but also for
FUNCTION_TYPE_ALIAS.

+      return ((ClassElementImplementation) cls).findElement(name);
+    }
+    return null;
   }
 
   public static MethodElement methodFromFunctionExpression(DartFunctionExpression node,