bug#23533: 24.5; test-completion with completion-regexp-list

[Eli Zaretskii]

> From: Noam Postavsky <npostavs@users.sourceforge.net>
> Date: Sat, 18 Jun 2016 13:14:59 -0400
> Cc: 23533@debbugs.gnu.org, ynyaaa@gmail.com
> 
> On Sat, Jun 18, 2016 at 4:08 AM, Eli Zaretskii <eliz@gnu.org> wrote:
> > I'm not sure this is a bug.
> 
> I  think it's pretty clearly a bug, because the docs explain that
> test-completion takes the same arguments as all-completions and
> try-completions, which do handle an alist COLLECTION with a non-nil
> completion-regexp-list.

When code contradicts the documentation, it's not immediately clear
that the code should be fixed.

Anyway, I don't consider myself an expert on completion, so I feel
uneasy about makings this change without any of the experts voicing
their opinions on the change.