SCM_CLASS_SYS_FDSET 2740 src/gauche.h   #define SCM_SYS_FDSET_P(obj)    (SCM_XTYPEP(obj, SCM_CLASS_SYS_FDSET))
SCM_CLASS_SYS_FDSET 1300 src/system.c       SCM_SET_CLASS(set, SCM_CLASS_SYS_FDSET);
SCM_CLASS_SYS_FDSET 1309 src/system.c       SCM_SET_CLASS(set, SCM_CLASS_SYS_FDSET);