public Builder clearSpecExecutionStartingRequest() {
        if (specExecutionStartingRequestBuilder_ == null) {
          specExecutionStartingRequest_ = main.Messages.SpecExecutionStartingRequest.getDefaultInstance();
          onChanged();
        } else {
          specExecutionStartingRequestBuilder_.clear();
        }
        bitField0_ = (bitField0_ & ~0x00000008);
        return this;
      }