ScmSystemError    138 src/error.c    SCM_DEFINE_BASE_CLASS(Scm_SystemErrorClass, ScmSystemError,
ScmSystemError    191 src/error.c    static ScmObj syserror_number_get(ScmSystemError *obj)
ScmSystemError    196 src/error.c    static void syserror_number_set(ScmSystemError *obj, ScmObj val)