code: def check_that_operator_can_be_applied_to_produces_items(op, g1, g2):
      
      g1_tmp_copy = g1.spawn()
      g2_tmp_copy = g2.spawn()
      sample_item_1 = next(g1_tmp_copy)
      sample_item_2 = next(g2_tmp_copy)
      try:
          op(sample_item_1, sample_item_2)
      except TypeError:
          raise TypeError(f"Operator '{op.__name__}' cannot be applied to items produced by {g1} and {g2} "
                          f"(which have type {type(sample_item_1)} and {type(sample_item_2)}, respectively)")
docs: Helper function to check that the operator `op` can be applied to items produced by g1 and g2.