When a Johnson v. United States, 135 S.Ct. 2551 (2015), movant would not be an armed career criminal if sentenced today, how can he show that his sentence is infected with error under Johnson when the sentencing court did not specify which clause of the Armed Career Criminal Act's violent felony definition a prior conviction fell under at the time of his original sentencing?

Whether a Johnson v. United States, 135 S.Ct. 2551 (2015), movant can show that his sentence is infected with error under Johnson when the sentencing court did not specify which clause of the Armed Career Criminal Act's violent felony definition a prior conviction fell under at the time of his original sentencing