SCM_CLASS_SYS_SIGSET 2576 src/gauche.h   #define SCM_SYS_SIGSET_P(obj)  SCM_XTYPEP(obj, SCM_CLASS_SYS_SIGSET)
SCM_CLASS_SYS_SIGSET  339 src/signal.c       return SCM_SYS_SIGSET(sigset_allocate(SCM_CLASS_SYS_SIGSET, SCM_NIL));