SCM_CLASS_MACRO  3015 src/class.c        CINIT(SCM_CLASS_MACRO,            "<macro>");
SCM_CLASS_MACRO  2417 src/gauche.h   #define SCM_MACROP(obj)            SCM_XTYPEP(obj, SCM_CLASS_MACRO)
SCM_CLASS_MACRO    85 src/macro.c        SCM_SET_CLASS(s, SCM_CLASS_MACRO);