tflite::metrics::ConverterErrorData::ERROR_NEEDS_FLEX_OPS);
      } else {
        failed_custom_ops_[op_name].insert(op_desc);
        tfl::AttachErrorCode(
            inst->emitOpError("is neither a custom op nor a flex op"),
            tflite::metrics::ConverterErrorData::ERROR_NEEDS_CUSTOM_OPS);
      }
      return std::nullopt;
    }