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

[Noam Postavsky]

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).

> (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.

> If the source isn’t going to be rejected (e.g., if it’s quietly accepted or 
> only produces a warning), then the byte-code for it probably ought not to be 
> rejected.

Yes, that's why my patch rejects the source as well.