MalformedType used for all invalid type annotations.

sdk/lib/_internal/compiler/implementation/warnings.dart

Index: sdk/lib/_internal/compiler/implementation/warnings.dart
diff --git a/sdk/lib/_internal/compiler/implementation/warnings.dart b/sdk/lib/_internal/compiler/implementation/warnings.dart
index 8381bd500b6544406ac21100e69f2b6167eea93b..3784b290c5418ade27a94e932d24fcf2e6b20dc7 100644
--- a/sdk/lib/_internal/compiler/implementation/warnings.dart
+++ b/sdk/lib/_internal/compiler/implementation/warnings.dart
@@ -205,6 +205,11 @@ class MessageKind {
   static const MISSING_TYPE_ARGUMENT = const MessageKind(
       "missing type argument");
 
+  // TODO(johnniwinther): Use ADDITIONAL_TYPE_ARGUMENT or MISSING_TYPE_ARGUMENT
+  // instead.
+  static const TYPE_ARGUMENT_COUNT_MISMATCH = const MessageKind(
+      "incorrect number of type arguments on #{1}");
+
   static const MISSING_ARGUMENTS_TO_ASSERT = const MessageKind(
       "missing arguments to assert");