bug#44529: [PATCH] Convert apropos-internal from C to Lisp

[Eli Zaretskii]

> From: Stefan Kangas <stefan@marxist.se>
> Date: Mon, 9 Nov 2020 12:44:26 -0800
> Cc: 44529@debbugs.gnu.org, monnier@iro.umontreal.ca
> 
> > A bother: apropos.el is not preloaded, so please double-check that
> > none of the preloaded files call apropos-internal, otherwise that
> > would mean we need to preload apropos.el, which I think is
> > undesirable.
> 
> I only see one call in a preloaded file:
> 
> ./lisp/progmodes/elisp-mode.el:873: (dolist (sym (apropos-internal regexp))
> 
> (This is from a `cl-defmethod' for `xref-backend-apropos'.)
> 
> Does this mean we have to preload apropos.el?

Or move this Lisp implementation to another file, which is already
preloaded.

> I don't understand how, so I'm probably missing something.

Because if we don't, every Emacs session will load it right at the
start.