bug#27229: eldoc wrong highlighting for "when"

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: andrewjmoreton@gmail.com,  27229@debbugs.gnu.org
> Date: Tue, 03 May 2022 11:05:02 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > So now "C-h f when" says
> >
> >   (when COND &rest BODY)
> >
> > where it previously said
> >
> >   (when COND BODY...)
> >
> > Isn't this a regression?
> 
> In what way?  We have &rest BODY all over the place, and it's the
> correct syntax to specify that there's a body, so I don't understand
> what you mean.

But when and unless aren't functions, they are "special forms".  So
using &rest there is less self-explanatory for those who aren't
necessarily privy to the internals.

IOW, the removed (fn ..." stuff was there for a reason.  The original
bug report here wasn't about how we display the doc string, it was
about what eldoc does.  So IMO the fix should have been in eldoc,
which would also avoid this negative effect.