Function push_back

util/generic/string.h:856–859

    TBasicString& AppendUtf16(const ::TWtringBuf& s) Y_LIFETIME_BOUND;

    inline void push_back(TCharType c) {
        // TODO
        append(c);
    }

    template <class T>
    TBasicString& operator+=(const T& s) Y_LIFETIME_BOUND {