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).