bug#43597: 28.0.50; arc-mode.el fails to display a ZIP file

[Eli Zaretskii]

> From: Stephen Berman <stephen.berman@gmx.net>
> Cc: schwab@linux-m68k.org,  43597@debbugs.gnu.org
> Date: Fri, 25 Sep 2020 09:13:42 +0200
> 
> On Fri, 25 Sep 2020 09:01:02 +0300 Eli Zaretskii <eliz@gnu.org> wrote:
> 
> >> From: Stephen Berman <stephen.berman@gmx.net>
> >> Date: Thu, 24 Sep 2020 22:40:15 +0200
> >> Cc: 43597@debbugs.gnu.org
> >>
> >>   (let ((p (archive-l-e (+ (point) 16) 4))
> >>         files)
> >>     (when (= p -1)
> >>       ;; If the offset of end-of-central-directory is -1, this is a
> >>       ;; Zip64 extended ZIP file format, and we need to glean the info
> >>       ;; from Zip64 records instead.
> >>
> > This code worked when support for ZIP64 was added.
> >
> > Could it be that the problem is in archive-l-e?  Something related to
> > bignums, perhaps?
> 
> According to NEWS bignum support was added in Emacs 27, so I just made a
> fresh build from the Emacs 26 branch and get the same failure.

Where can I find a zip file which exhibits this problem?