new TokenType and Keyword API

pkg/front_end/lib/src/fasta/parser/parser.dart

 // Copyright (c) 2012, 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.
 
 library fasta.parser.parser;
 
 import '../fasta_codes.dart'
     show
         FastaCode,
         FastaMessage,
@@ skipping 787 matching lines @@
     }
     listener.handleNoType(token);
     return token;
   }
 
   bool isValidTypeReference(Token token) {
     final kind = token.kind;
     if (identical(kind, IDENTIFIER_TOKEN)) return true;
     if (identical(kind, KEYWORD_TOKEN)) {
       Keyword keyword = (token as KeywordToken).keyword;
-      String value = keyword.syntax;
+      String value = keyword.lexeme;
       return keyword.isPseudo ||
           (identical(value, 'dynamic')) ||
           (identical(value, 'void'));
     }
     return false;
   }
 
   /// Returns true if [token] matches '<' type (',' type)* '>' '(', and
   /// otherwise returns false. The final '(' is not part of the grammar
   /// construct `typeArguments`, but it is required here such that type
@@ skipping 3074 matching lines @@
     return reportUnrecoverableError(
         token, () => code.format(uri, token.charOffset, string));
   }
 }
 
 typedef FastaMessage NoArgument(Uri uri, int charOffset);
 
 typedef FastaMessage TokenArgument(Uri uri, int charOffset, Token token);
 
 typedef FastaMessage StringArgument(Uri uri, int charOffset, String string);