public Builder mergeExecuteStepResponse(main.Messages.ExecuteStepResponse value) {
        if (executeStepResponseBuilder_ == null) {
          if (((bitField0_ & 0x00000100) == 0x00000100) &&
              executeStepResponse_ != main.Messages.ExecuteStepResponse.getDefaultInstance()) {
            executeStepResponse_ =
              main.Messages.ExecuteStepResponse.newBuilder(executeStepResponse_).mergeFrom(value).buildPartial();
          } else {
            executeStepResponse_ = value;
          }
          onChanged();
        } else {
          executeStepResponseBuilder_.mergeFrom(value);
        }
        bitField0_ |= 0x00000100;
        return this;
      }