anchor.diff:      }
     }
   
  -  Stream get onChanged => file.onChanged.map((value) {
  -        return value;
  -      });
  +  Stream get onChanged => file.onChanged.map((value) => value);
   }
   
   class EditorDocumentProperty implements Property {
  
positive.code:     } else if (url.hasQuery && url.queryParameters['source'] != null) {
        Future<UuidContainer> futureGistId = dartSupportServices
            .retrieveGist(id: url.queryParameters['source']);
        await futureGistId.then((UuidContainer gistId) {
          gistLoader.loadGist(gistId.uuid).then((Gist backing) {
            editableGist.setBackingGist(backing);
            router.go('gist', {'gist': backing.id});
  
negative.code:         ..uuid = url.queryParameters['export'];
        Future<PadSaveObject> exportPad =
            dartSupportServices.pullExportContent(requestId);
        exportPad.then((pad) {
          Gist blankGist = createSampleGist();
          blankGist.getFile('main.dart').content = pad.dart;
          blankGist.getFile('index.html').content = pad.html;
  