ancillary_s_ipv6_pktinfo  534 ext/socket/ancdata.c ancillary_s_ipv6_pktinfo(VALUE self, VALUE v_addr, VALUE v_ifindex)
ancillary_s_ipv6_pktinfo  558 ext/socket/ancdata.c #define ancillary_s_ipv6_pktinfo rb_f_notimplement