struct Comparator {
    inline bool operator()(const RawMapping& r1, const RawMapping& r2) {
        const OriginalLocation& o1 = *r1.original;
        const OriginalLocation& o2 = *r2.original;
        return std::tie(o1.line, o1.column, o1.name,r1.generated_line, r1.generated_column) <
            std::tie(o2.line, o2.column,o2.name, r2.generated_line, r2.generated_column);
    }
};