SCM_CLASS_SYS_SERVENT  248 ext/net/gauche/net.h #define SCM_SYS_SERVENT_P(obj) SCM_XTYPEP(obj, SCM_CLASS_SYS_SERVENT)
SCM_CLASS_SYS_SERVENT  356 ext/net/netdb.c     SCM_SET_CLASS(entry, SCM_CLASS_SYS_SERVENT);