bug#59213: Emacs 29: Edebug fails to instrument a parameter whose name begins with _

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: acm@muc.de,  59213@debbugs.gnu.org
> Date: Sun, 12 Feb 2023 22:26:55 -0500
> 
> >> I think that's good enough for `emacs-29`, yes.
> >
> > Why do we have to fix this in Emacs 29?  The problem doesn't sound
> > very important to me: variables that are ignored should not be a
> > subject of scrutiny in Edebug too frequently, and I cannot even
> > imagine a use case where it would be important for debugging.
> >
> > So I'd prefer to fix this on master instead.
> 
> The reason I was thinking of `emacs-29` was that it's a regression in
> Emacs-29.  But I agree that it's not super important, so it can go to
> `master` (we may want to try and remember to backport it for
> Emacs-29.2, tho).

Right.  Emacs 29.1 will have enough exciting new regressions anyway.