Because harmless-error review of Erlinger error typically requires appellate judges to evaluate facts outside the record of conviction for the charged § 922(g)(1) offense, is Erlinger error structural?

II. If harmless-error review applies to Erlinger error, can appellate judges rely on Shepard documents to decide what a hypothetical jury would find when the defendant pled guilty only to the charged § 922(g) offense?

III. Whether the Double Jeopardy Clause prohibits imposing an enhanced ACCA sentence when a defendant pleaded guilty only to the simple § 922(g) offense and jeopardy has attached to that conviction?

Whether the Double Jeopardy Clause prohibits imposing an enhanced ACCA sentence when a defendant pleaded guilty only to the simple § 922(g) offense and jeopardy has attached to that conviction?