Stunned PC at the end of turn

@JeremyECrawford If a PC is stunned until end of turn and has to make a dex save at end of turn, does the PC auto-fail the dex save?

— DMDanDanFielding (@DMdandanfieldng) October 22, 2015

As DM, I let the player decide the order of effects that happen to a character simultaneously. #DnD https://t.co/e38okXCKFq

— Jeremy Crawford (@JeremyECrawford) October 24, 2015