A reddit user noted these messages popping up when starting Emacs

Loading ‘~/.emacs.d/init’: unescaped character literals `?[', `?]' detected!

and wondered what to do about it.  Perhaps it would be a good idea to
just say something like

unescaped character literals `?[', `?]' detected, `?\[', `?\]' expected

or something along those lines?  For Emacs 26.2.