Subject: RE: bug#29842: 27.0; `dired-change-marks': args should not be optional

From: Drew Adams <[email-masked]>
Date: Thu, 28 Dec 2017 15:57:55 -0800 (PST)

> The more information the better; just a ding force you to read the
> source code to know what was wrong.
> Maybe `user-error' instead of `error'?

Yes `user-error' is appropriate here.  Sorry, I always
forget about its existence.