public Builder setSpecExecutionStartingRequest(
          main.Messages.SpecExecutionStartingRequest.Builder builderForValue) {
        if (specExecutionStartingRequestBuilder_ == null) {
          specExecutionStartingRequest_ = builderForValue.build();
          onChanged();
        } else {
          specExecutionStartingRequestBuilder_.setMessage(builderForValue.build());
        }
        bitField0_ |= 0x00000008;
        return this;
      }