anchor.diff:                  });
                 } else {
                   throw "non-fast-forward merge is not yet supported.";
  -                //return _createAndUpdateRef(headRefName, localSha, remoteSha);
                 }
               });
             });
  
positive.code: import 'package:chrome/chrome_app.dart' as chrome;
  
  import '../file_operations.dart';
  import '../object.dart';
  import '../object_utils.dart';
  import '../objectstore.dart';
  import '../options.dart';
  import '../utils.dart';
  import 'checkout.dart';
  import 'fetch.dart';
  import 'merge.dart';
  
  /**
   * A git pull command implmentation.
  
negative.code:       return graph.commits.any((commit) => commit.sha == localSha);
      });
    }
  }
  