From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nicolas Goaziou <n.goaziou@gmail.com>
Subject: Re: probable caching bug?
Date: Thu, 05 Dec 2013 16:47:51 +0100
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References: <87pppcys45.fsf@ericabrahamsen.net>
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In-Reply-To: <87pppcys45.fsf@ericabrahamsen.net> (Eric Abrahamsen's message of
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To: Eric Abrahamsen <eric@ericabrahamsen.net>
Cc: emacs-orgmode@gnu.org

Hello,

Eric Abrahamsen <eric@ericabrahamsen.net> writes:

> While editing a plain list yesterday I noticed what I guess was a bug in
> the caching mechanism.

It looks like it, indeed.

> The list item was wrapped to several lines, and I noticed that calling
> C-e while on the last line gave me "wrong-type-argument
> integer-or-marker-p nil". Trying to fill the item with M-q gave me
> "user-error: An element cannot be parsed line 635".

[...]

Unfortunately, the source of the cache corruption may be totally
unrelated to the action triggering the error. Thus, cache bugs are quite
hard to reproduce. When hunting down one of them, I usually call the
following function after each non-trivial buffer modification.

  (defun ngz-random-test (&optional n contextp)
    (save-excursion
      (dotimes (k (or n 100))
        (goto-char (1+ (random (point-max))))
        (let ((real-element (let (org-element-use-cache)
                              (if contextp (org-element-context)
                                (org-element-at-point)))))
          (or (equal real-element
                     (if contextp (org-element-context) (org-element-at-point)))
              (message "`%s' at %d is corrupted."
                       (org-element-type real-element)
                       (org-element-property :begin real-element)))))))

BTW, is your Org recent? I fixed a similar problem (i.e. cache
corruption in lists) about two weeks ago in commit
4466af5c115b56377d7251e848860dc03212c583.


Regards,

-- 
Nicolas Goaziou