GNU bug report logs - #13438
24.2.92; Infinite loop in python imenu support

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Package: emacs;

Reported by: Ivan Andrus <darthandrus <at> gmail.com>

Date: Mon, 14 Jan 2013 21:00:02 UTC

Severity: important

Found in version 24.2.92

Done: Fabián Ezequiel Gallina <fabian <at> anue.biz>

Bug is archived. No further changes may be made.

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From: Glenn Morris <rgm <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Fabián Ezequiel Gallina <fabian <at> anue.biz>, 13438 <at> debbugs.gnu.org
Subject: bug#13438: /srv/bzr/emacs/emacs-24 r111196: * imenu.el (imenu-default-create-index-function): Remove useless
Date: Fri, 25 Jan 2013 03:34:53 -0500

>> Why is this issue (apparently) only seen in Python mode

Answering my own question, it happens in any mode that sets
imenu-prev-index-position-function and
imenu-extract-index-name-function, but there are very few of those.

Eg prolog mode. With buffer contents:

------
fac(0,1).
fac(N,F) :- N > 0, M is N - 1,
       fac(M,Fm), F is N * Fm.
------

and point at point-min, switching to prolog-mode causes the same issue.

How about taking the more cautious approach with:

(when (and (= pos (point))
           (not (bobp)))
   (error "Infinite loop... ))

(IIUC, this was actually the suggestion in
http://lists.gnu.org/archive/html/emacs-devel/2013-01/msg00510.html ?)
This bug report was last modified 12 years and 118 days ago.

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