anchor.diff:        // validation and create change
         finalStatus = await refactoring.checkFinalConditions();
         if (_hasFatalError) {
  -        return _sendResultResponse();
  +        _sendResultResponse();
  +        return;
         }
         // simulate an exception
         if (test_simulateRefactoringException_change) {
  
positive.code:       feedback.elementKindName = refactoring.elementKindName;
        feedback.oldName = refactoring.oldName;
      }
    }
  
    void _reset([engine.AnalysisContext context]) {
  
negative.code:    * Initializes this context to perform a refactoring with the specified
     * parameters. The existing [Refactoring] is reused or created as needed.
     */
    Future _init(RefactoringKind kind, String file,
        int offset, int length) async {
      await server.onAnalysisComplete;
      // check if we can continue with the existing Refactoring instance
  