docs: def push_state(self, new_file=''):
          'Saves the current error state to parse subpackages'
  
          self.subpackages.append({'detected_type': self.detected_type,
                                   'message_tree': self.message_tree,
                                   'resources': self.pushable_resources,
                                   'metadata': self.metadata})
  
          self.message_tree = {}
          self.pushable_resources = {}
          self.metadata = {'requires_chrome': False,
                           'listed': self.metadata.get('listed'),
                           'validator_version': validator.__version__}
  
          self.package_stack.append(new_file)