Sorry. In any Emacs version. I tested with a fairly recently compiled
`master', but judging by the source code I checked out two minutes ago, the
bug is there currently too. The cause is this:

            (insert-file-contents (pop files))

This form is not inside `(ignore-errors ...)' and so any failure is
propagated out of `package-dir-info' too.

Paul

On Sat, 23 May 2020 at 20:23, Eli Zaretskii <eliz@gnu.org> wrote:

> > From: Paul Pogonyshev <pogonyshev@gmail.com>
> > Date: Sat, 23 May 2020 19:50:02 +0200
> >
> > - edit any Elisp file, but don't save it;
> > - open its directory in Dired;
> > - evaluate `(package-dir-info)'.
> >
> > Fails with: (file-missing "Opening input file" "No such file or
> directory" ".../.#blabla.el")
>
> In what version of Emacs is that?  Please always supply the
> information collected by report-emacs-bug, as that saves unnecessary
> questions such as this one.
>
> Thanks.
>
>