docs: def p_contextualize_items(self, t):
          """contextualize_items : contextualize_items contextualize_item
                                 | contextualize_item
                                 | empty"""
          if len(t) == 3:
              t[0] = t[1]
              t[0].append(t[2])
          elif t[1]:
              t[0] = [t[1]]
          else:
              t[0] = []