SCM_DEFINE_ABSTRACT_CLASS   99 src/class.c    SCM_DEFINE_ABSTRACT_CLASS(Scm_TopClass, NULL);
SCM_DEFINE_ABSTRACT_CLASS  100 src/class.c    SCM_DEFINE_ABSTRACT_CLASS(Scm_CollectionClass, SCM_CLASS_DEFAULT_CPL);
SCM_DEFINE_ABSTRACT_CLASS  101 src/class.c    SCM_DEFINE_ABSTRACT_CLASS(Scm_SequenceClass, SCM_CLASS_COLLECTION_CPL);