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 8fa90308df909de2a22b9d5a827d0dd82a0af7b2..29bd45b57dabc9cd92fde64de137104e73bfb912 100644
--- a/tests/compiler/dart2js/mock_compiler.dart
+++ b/tests/compiler/dart2js/mock_compiler.dart
@@ -71,8 +71,8 @@ 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_ {}