That's definitely what raises the error, though the comment implies to me
that it's unexpected/undesirable that it is triggered.

On Thu, Sep 8, 2022 at 9:13 AM Lars Ingebrigtsen <larsi@gnus.org> wrote:

> James Ferguson <james@faff.org> writes:
>
> > When trying to close the terminal one way or another (with
> debug-on-error) I now
> > get:
> >
> > Debugger entered--Lisp error: (file-error "File ‘.’ must be absolute")
> >   signal(file-error ("File ‘.’ must be absolute"))
> >   tramp-error((tramp-file-name "sshx" nil nil "4x02" nil "." nil)
> file-error "File `%s'
> > must be absolute" ".")
> >   tramp-file-name-unify((tramp-file-name "sshx" nil nil "4x02" nil "."
> nil) ".")
>
> I think this is the same as bug#57572 -- it's bugging out here:
>
>                ;; FIXME: This is a sanity check.  When this error
>                ;; doesn't happen for a while, it can be removed.
>                (or (file-name-absolute-p localname)
>                    (tramp-error
>                     vec 'file-error "File `%s' must be absolute"
> localname))
>
> So I guess this sanity check should perhaps be removed?  Michael?
>