Avoid a possible one-byte OOB read off of .drectve sections

             tok.startswith_lower("-include:"))

      result.includes.push_back(tok.substr(strlen("/include:")));

    else {

      // Save non-null-terminated strings to make proper C strings.

      bool HasNul = tok.data()[tok.size()] == '\0';

      // Copy substrings that are not valid C strings. The tokenizer may have

      // already copied quoted arguments for us, so those do not need to be

      // copied again.

      bool HasNul = tok.end() != s.end() && tok.data()[tok.size()] == '\0';

      rest.push_back(HasNul ? tok.data() : saver.save(tok).data());

    }

  }