Scm_NullClass     767 src/gauche.h   SCM_CLASS_DECL(Scm_NullClass);
Scm_NullClass     770 src/gauche.h   #define SCM_CLASS_NULL          (&Scm_NullClass)
Scm_NullClass      54 src/list.c     SCM_DEFINE_BUILTIN_CLASS(Scm_NullClass, NULL, NULL, NULL, NULL, list_cpl);