On Sat, 6 Feb 2021 at 11:27, Reuben Thomas wrote: > I just looked at the history of provided-mode-derived-p, and it seems that > a fix had already been made for this problem. See commit 48ff4c0b2f7. (I am > using emacs 26.3, which does not have this fix.) > Ah, sorry, the earlier fix is for when one of MODES is an alias, not for when MODE is an alias! -- https://rrt.sc3d.org