Handle mutually recursive re-exports in dartdocgen

pkg/docgen/lib/src/models/library.dart

 // Copyright (c) 2014, 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 docgen.models.library;
 
 import 'dart:io';
 
 import 'package:markdown/markdown.dart' as markdown;
 
@@ skipping 35 matching lines @@
   /// created, else creates it.
   factory Library(LibraryMirror mirror) {
     var library = getDocgenObject(mirror);
     if (library is DummyMirror) {
       library = new Library._(mirror);
     }
     return library;
   }
 
   Library._(LibraryMirror libraryMirror) : super(libraryMirror) {
-    var exported = calcExportedItems(libraryMirror);
+    var exported = calcExportedItems(libraryMirror, {});
     var exportedClasses = addAll(exported['classes'],
         dart2js_util.typesOf(libraryMirror.declarations));
     updateLibraryPackage(mirror);
     exportedClasses.forEach((String mirrorName, TypeMirror mirror) {
       if (mirror is TypedefMirror) {
         // This is actually a Dart2jsTypedefMirror, and it does define value,
         // but we don't have visibility to that type.
         if (includePrivateMembers || !mirror.isPrivate) {
           typedefs[dart2js_util.nameOf(mirror)] = new Typedef(mirror, this);
         }
@@ skipping 116 matching lines @@
   bool get isPrivate => false;
 
   Indexable get owner => null;
 
   // This is a known incomplete implementation of Indexable
   // overriding noSuchMethod to remove static warnings
   noSuchMethod(Invocation invocation) {
     throw new UnimplementedError(invocation.memberName.toString());
   }
 }