Update check for cyclic typedefs.

sdk/lib/_internal/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.
 
 part of dart2js;
 
 const DONT_KNOW_HOW_TO_FIX = "";
 
 /**
  * The messages in this file should meet the following guide lines:
@@ skipping 682 matching lines @@
       examples: const ["""
 typedef G F(); // The return type 'G' is a self-reference through typedef 'G'.
 typedef F G(); // The return type 'F' is a self-reference through typedef 'F'.
 main() { F f = null; }""",
 """
 typedef G F(); // The return type 'G' creates a self-reference.
 typedef H G(); // The return type 'H' creates a self-reference.
 typedef H(F f); // The argument type 'F' creates a self-reference.
 main() { F f = null; }"""]);
 
-  static const CYCLIC_TYPEDEF_TYPEVAR = const MessageKind(
-      "Internal Error: Recursive type variable bounds are not "
-      "supported on typedefs.");
-
   static const MessageKind CLASS_NAME_EXPECTED = const MessageKind(
       "Error: Class name expected.");
 
   static const MessageKind CANNOT_EXTEND = const MessageKind(
       "Error: '#{type}' cannot be extended.");
 
   static const MessageKind CANNOT_IMPLEMENT = const MessageKind(
       "Error: '#{type}' cannot be implemented.");
 
   static const MessageKind CANNOT_EXTEND_MALFORMED = const MessageKind(
@@ skipping 753 matching lines @@
 
 class CompileTimeConstantError extends Diagnostic {
   CompileTimeConstantError(MessageKind kind, Map arguments, bool terse)
     : super(kind, arguments, terse);
 }
 
 class CompilationError extends Diagnostic {
   CompilationError(MessageKind kind, Map arguments, bool terse)
     : super(kind, arguments, terse);
 }