code: def _prepack(self):
          '''
          Prepack stage. For parser internal use.
          '''
          current = self
          while current is not None:
              current._parser.prepack(current, skip_self = True)
              current = getattr(current, '_sub', None)
          current = self
          while current is not None:
              current._parser.prepack(current, skip_sub = True)
              current = getattr(current, '_sub', Nonef _prepack(self):
          '''
          Prepack stage. For parser internal use.
          '''
          current = self
          while current is not None:
              current._parser.prepack(current, skip_self = True)
              current = getattr(current, '_sub', None)
          current = self
          while current is not None:
              current._parser.prepack(current, skip_sub = True)
              current = getattr(current, '_sub', None)
docs: Prepack stage. For parser internal use.