message: Compilation fix for GCC
diff: @@ -48,7 +48,7 @@ static Token::Type LookupIdent(const std::string & ident) {
  std::string to_upper(const StringView & str) {
  std::string ret(str.data(), str.size());
  - std::transform(ret.begin(), ret.end(), ret.begin(), std::toupper);
  + std::transform(ret.begin(), ret.end(), ret.begin(), ::toupper);
  return ret;
  }
  