bug#26272: default-directory: Remark that it must be a directory name

[Noam Postavsky]

On Mon, Mar 27, 2017 at 2:26 PM, Eli Zaretskii <eliz@gnu.org> wrote:
>> From: Noam Postavsky <npostavs@users.sourceforge.net>
>> Date: Mon, 27 Mar 2017 11:52:21 -0400
>> Cc: Tino Calancha <tino.calancha@gmail.com>, 26272@debbugs.gnu.org
>>
>> >> > Didn't we discuss that at some point in the past?
>> >> I don't remember it.  Maybe with another person.
>> >
>> > No, I meant on emacs-devel, not with you personally.
>>
>> This one maybe? (it's about load-path though)
>> https://lists.gnu.org/archive/html/emacs-devel/2015-10/msg02060.html
>
> Yes, but AFAIR it also touched default-directory.

Ah, it seems that code was fixed to be more tolerant: the trailing
slash in default-directory used to matter for executing processes, but
not any more: 
https://lists.gnu.org/archive/html/emacs-devel/2015-10/msg02367.html

(the rest of the discussion seems to mostly just go in circles)