MalformedType used for all invalid type annotations.

tests/compiler/dart2js/mock_compiler.dart

Index: tests/compiler/dart2js/mock_compiler.dart
diff --git a/tests/compiler/dart2js/mock_compiler.dart b/tests/compiler/dart2js/mock_compiler.dart
index d24770145877e231bc9c3eb1fb231aee1af6effd..140cec22000e15b633feffc98061b928de264708 100644
--- a/tests/compiler/dart2js/mock_compiler.dart
+++ b/tests/compiler/dart2js/mock_compiler.dart
@@ -81,8 +81,8 @@ const String DEFAULT_CORELIB = r'''
   class Object {}
   class Type {}
   class Function {}
-  class List {}
-  abstract class Map {}
+  class List<T> {}
+  abstract class Map<K,V> {}
   class Closure {}
   class Null {}
   class Dynamic_ {}