bug#57481: elisp code utilising derived-mode-parent

[Eli Zaretskii]

> Cc: 57481@debbugs.gnu.org
> Date: Wed, 31 Aug 2022 00:38:46 +1200
> From: Phil Sainty <psainty@orcon.net.nz>
> 
> On 2022-08-31 00:08, Christopher Dimech wrote:
> > Can one do something that can be run in elisp code and in
> > lisp-interaction-mode without requirement that the mode one
> > is interested in has been loaded?
> 
> You're asking whether Emacs can tell you things it doesn't know.

Well, it's Emacs, isn't it?  Why shouldn't it have a feature whereby
it tells us things it doesn't know about?  It certainly sounds useful
to have.