rb_obj_instance_exec   69 ext/tk/tkutil/tkutil.c       rb_obj_instance_exec(1, &obj, obj);
rb_obj_instance_exec  281 include/ruby/intern.h VALUE rb_obj_instance_exec(int, VALUE*, VALUE);
rb_obj_instance_exec 1432 vm_eval.c          rb_define_method(rb_cBasicObject, "instance_exec", rb_obj_instance_exec, -1);