(1) Does the ACCA occasions-different inquiry, requiring a detailed, multi-factored analysis of the facts surrounding at least three prior offenses—facts which are not intrinsic to the elements of § 922(g)(1)—render Erlinger errors structural?

(2) If harmless-error review applies to a fully preserved Erlinger error, what is the proper test when a defendant is found guilty of only the lesser offense under § 922(g)(1)?

Does the ACCA occasions-different inquiry render Erlinger errors structural, and what is the proper harmless-error test when a defendant is found guilty of only the lesser offense under § 922(g)(1)?