TensorType list_handle_element_t = variant_element_t.getSubtypes()[0];

  if (!RefineResultType(op, op->getResult(0), dst_list_handle_t)) {
    DCOMMENT("InferShapeForTensorListPopBackOp could not propogate result 0"
             << op);
    return false;
  }
  if (!RefineResultType(op, op->getResult(1), list_handle_element_t)) {
    DCOMMENT("InferShapeForTensorListPopBackOp could not propogate result 1"