void
sub_from_xs()
    PREINIT:
        int nx;
        char *sx;
    PPCODE:
        nx = get_nx();
        sx = get_sx();

        EXTEND(SP, 2);
        PUSHs(sv_2mortal(newSViv(nx)));
        PUSHs(sv_2mortal(newSVpv(sx, 0)));