Function isReservedTag

compiler/cpp/tests/catch/catch.hpp:8117–8119

            return TestCaseInfo::None;
    }
    inline bool isReservedTag( std::string const& tag ) {
        return parseSpecialTag( tag ) == TestCaseInfo::None && tag.size() > 0 && !std::isalnum( tag[0] );
    }
    inline void enforceNotReservedTag( std::string const& tag, SourceLineInfo const& _lineInfo ) {
        if( isReservedTag( tag ) ) {
            std::ostringstream ss;