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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: AW: font-locking and open parens in column 0
Date: Fri, 10 Nov 2006 21:11:20 -0500
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    > The purpose of open-paren-in-column-0-is-defun-start is to enable to
    > disable this heuristic.  Setting it to nil disables the heuristic.
    > So I think his change is correct.

    Huh?  What do you mean by "heuristic".

Emacs is looking for an open-paren at top level in list structure.
The heuristic is to take an open-paren at column zero and assume
it is at top level.

I am having trouble relating the rest of your message to this issue.
This is just a matter of implementing
open-paren-in-column-0-is-defun-start = nil to do what it says it will
do.