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

[Noam Postavsky]

On Mon, Mar 27, 2017 at 11:32 AM, Eli Zaretskii <eliz@gnu.org> wrote:
>> >> The docstring of `file-name-as-directory' suggests that is
>> >> important that `default-directory' be a directory name, i.e.,
>> >> for instance in GNU/Linux ends with '/'.  The docstring of
>> >> `default-directory' doesn't mention it.
>> >
>> > 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