Added support for exports and re-exports.

lib/compiler/implementation/scanner/keyword.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.
 
 /**
  * A keyword in the Dart programming language.
  */
 class Keyword implements SourceString {
   static const List<Keyword> values = const <Keyword> [
       const Keyword("break"),
@@ skipping 32 matching lines @@
       const Keyword("external", isBuiltIn: true),
       const Keyword("factory", isBuiltIn: true),
       const Keyword("get", isBuiltIn: true),
       const Keyword("implements", isBuiltIn: true),
       const Keyword("interface", isBuiltIn: true),
       const Keyword("operator", isBuiltIn: true),
       const Keyword("set", isBuiltIn: true),
       const Keyword("static", isBuiltIn: true),
       const Keyword("typedef", isBuiltIn: true),
 
+      const Keyword("export", isPseudo: true),
       const Keyword("hide", isPseudo: true),
       const Keyword("import", isPseudo: true),
       const Keyword("library", isPseudo: true),
       const Keyword("native", isPseudo: true),
       const Keyword("on", isPseudo: true),
       const Keyword("part", isPseudo: true),
       const Keyword("show", isPseudo: true),
       const Keyword("source", isPseudo: true) ];
 
   static const DYNAMIC = const Keyword("Dynamic", isBuiltIn: true);
@@ skipping 152 matching lines @@
   final Keyword keyword;
 
   LeafKeywordState(String syntax) : keyword = Keyword.keywords[syntax];
 
   bool isLeaf() => true;
 
   KeywordState next(int c) => null;
 
   String toString() => keyword.syntax;
 }