(concurring specially).
I concur but in doing so I prefer to call to the attention of the trial courts this statement quoted from McCarthy v. United States, 394 U.S. 459, 89 S.Ct. 1166, 22 L.Ed.2d 418, in State v. Sisco, 169 N.W.2d 542, 546 (Iowa 1969): “ * * * The more meticulously the Rule is adhered to, the more it tends to discourage, or at least to enable more expeditious disposition of, *532the numerous and often frivolous post-conviction attacks on the constitutional validity of guilty pleas.”
RAWLINGS, J., joins in this special concurrence.