Subject: bug#68625: 30.0.50; derived.el: Remove Emacs-21 era compatibility functions

From: Stefan Kangas <[email-masked]>
Date: Sun, 21 Jan 2024 01:50:20 -0600

Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of
text editors" <[email-masked]> writes:

> derived.el ends with:
>
>     ;;; OBSOLETE
>     ;; The functions below are only provided for backward compatibility with
>     ;; code byte-compiled with versions of derived.el prior to Emacs-21.
>
> followed by 9 functions which have not been used since.
> Is it time to remove them?

Makes sense to me.