bug#12898: 24.2.50.1; Completion is not passed further on in emacs-lisp, org-mode etc.

[Stefan Monnier]

> In elisp mode completion-at-point-functions is set to
> (lisp-completion-at-point t).  If I set it to (t), filename completion
> works as expected.  So, it's the lisp-completion-at-point that is not
> handing the completion over.

Indeed, lisp-completion-at-point should return nil when it determines
that it cannot provide completion information for the text around point.
Problem is: how should it determine that?


        Stefan