object.c:962
static VALUE
rb_obj_private_methods(argc, argv, obj)
    int argc;
    VALUE *argv;
    VALUE obj;
{
    if (argc == 0) {		/* hack to stop warning */
	VALUE args[1];

	args[0] = Qtrue;
	return rb_class_private_instance_methods(1, args, CLASS_OF(obj));
    }
    return rb_class_private_instance_methods(argc, argv, CLASS_OF(obj));
}
