SCM_CLASS_SYS_STAT 2635 src/gauche.h   #define SCM_SYS_STAT_P(obj)   (SCM_XTYPEP(obj, SCM_CLASS_SYS_STAT))
SCM_CLASS_SYS_STAT  618 src/system.c       SCM_SET_CLASS(s, SCM_CLASS_SYS_STAT);