Check number of type arguments.

lib/compiler/implementation/warnings.dart

 // Copyright (c) 2011, 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.
 
 class MessageKind {
   final String template;
   const MessageKind(this.template);
 
   static final GENERIC = const MessageKind('#{1}');
 
@@ skipping 147 matching lines @@
 
   static final CANNOT_EXTEND = const MessageKind(
       "#{1} cannot be extended");
 
   static final CANNOT_IMPLEMENT = const MessageKind(
       "#{1} cannot be implemented");
 
   static final ILLEGAL_SUPER_SEND = const MessageKind(
       "#{1} cannot be called on super");
 
+  static final ADDITIONAL_TYPE_ARGUMENT = const MessageKind(
+      "additional type argument");
+
+  static final MISSING_TYPE_ARGUMENT = const MessageKind(
+      "missing type argument");
+
   toString() => template;
 }
 
 class Message {
   final kind;
   final List arguments;
   String message;
 
   Message(this.kind, this.arguments);
 
@@ skipping 47 matching lines @@
   String toString() => message.toString();
 }
 
 class CompileTimeConstantError {
   final Message message;
   CompileTimeConstantError.message(this.message);
   CompileTimeConstantError(MessageKind kind, List<Type> arguments)
     : message = new Message(kind, arguments);
   String toString() => message.toString();
 }