memcmp(&a->addr.sin6.sin6_addr, &b->addr.sin6.sin6_addr,
sizeof(struct in6_addr)) == 0;
default: /* fall through and signal error */
memcmp(&a->addr.sin6.sin6_addr, &b->addr.sin6.sin6_addr,
sizeof(struct in6_addr)) == 0;
default: /* fall through and signal error */