rb_ivar_defined   430 ext/digest/digest.c         if (rb_ivar_defined(p, id_metadata)) {
rb_ivar_defined   742 include/ruby/intern.h VALUE rb_ivar_defined(VALUE, ID);
rb_ivar_defined  1881 object.c           return rb_ivar_defined(obj, id);
rb_ivar_defined    25 struct.c       	if (rb_ivar_defined(c, id))