Fix access to fields that didn't exist in the class.

tests/language/cast2_test.dart

Index: tests/language/cast2_test.dart
diff --git a/tests/language/field_decl_missing_var_type_test.dart b/tests/language/cast2_test.dart
similarity index 50%
copy from tests/language/field_decl_missing_var_type_test.dart
copy to tests/language/cast2_test.dart
index c34ad3165155615d900bc30ae8f6b37945838c91..1ddf873280dd40c729d548201a51d094892e409f 100644
--- a/tests/language/field_decl_missing_var_type_test.dart
+++ b/tests/language/cast2_test.dart
@@ -1,15 +1,23 @@
-// 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.
-// Dart test program for constructors and initializers.
-
-// Exercises issue 2997, missing var or type on field declarations should
-// generate a compile-time error.
-
-class A {
-  _this;                      /// 01: compile-time error
-  A(x) : this._this = x;      /// 01: continued
-}
-main() {
-  new A(0);                   /// 01: continued
-}
+// 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.
+// Dart test program for constructors and initializers.
+
+// Test 'expression as Type' casts.
+
+class C {
+  final int foo = 42;
+}
+
+class D extends C {
+  final int bar = 37;
+}
+
+main() {
+  Object oc = new C();
+  Object od = new D();
+
+  (oc as Dynamic).bar;  /// 01: runtime error
+}
+
+