bug#17001: `documentation' fails with void-function help-split-fundoc, due to advice

[Glenn Morris]

Glenn Morris wrote:

>> emacs -Q
>> (documentation 'rename-buffer)
>>   ->  void-function help-split-fundoc
>
> PS I wondered why the byte-compiler does not warn about this.
> Seems bytecomp.el now requires help-fns in some cases.
> That seems like it could cause precisely this kind of problem.

PPS I see some wise person added related comments to help-fns.el some
time ago; e.g.:

  ;; FIXME: Move to subr.el?
  (defun help-function-arglist (def &optional preserve-names)

(why not to help.el, which is preloaded?)