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);