bug#29165: 26.0.90; can't use some code byte-compiled under emacs 24

[Noam Postavsky]

On Mon, Nov 13, 2017 at 3:05 PM, Noam Postavsky
<npostavs@users.sourceforge.net> wrote:
> On Mon, Nov 13, 2017 at 2:42 PM, Ken Raeburn <raeburn@permabit.com> wrote:
>
>> But even if we do make it an error, isn’t there usually a stage where it’s 
>> just a warning?
>
> Maybe. There hasn't been this time (for plain defun, I mean).

As another case, there wasn't any warning stage for changing setq to
only accept an even number of arguments.

>> (And if we’re going to make that sort of thing an error, we should probably 
>> check whether empty &key or &aux variable lists are similarly rejected.  I 
>> haven’t looked.)
>
> I believe empty &key would be tested in my patch, though not &aux.

Updated patch which handles &aux as well. I also tested a bootstrap
(doing this I found the previous patch messed up some positive cases).

v2-0001-Mention-new-strictness-for-optional-rest-in-argli.patch
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