/* call-seq:
 *   iseq.arg_simple => true or false
 *
 * Returns true if this sequence takes only simple (non-rest, non-opt,
 * non-block) args.
 */
static VALUE iseq_arg_simple(VALUE self)
{
  rb_iseq_t *iseqdat = iseq_check(self);
  return iseqdat->arg_simple ? Qtrue : Qfalse;
}