From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Monnier <monnier@iro.umontreal.ca>
Subject: Re: Completing with anything
Date: Tue, 24 May 2011 11:05:43 -0300
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> (defadvice completion-at-point
>   (after completion-at-point-complete-if-failed activate)
>   "Fallback on dabbrev if completion didn't do anything useful."
>     (unless ad-return-value
>       (dabbrev-expand nil)))

BTW, you can avoid the advice by using your own

  (defun al-completion-at-point ()
    (interactive)
    (or (completion-at-point)
        (dabbrev-expand nil)))


-- Stefan