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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: function-called-at-point: ignore-errors around find-tag-default
Date: Thu, 17 Feb 2005 18:09:09 -0500
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    I already debugged it as in my other post in this thread:
    (forward-sexp -1) errors when it is in the middle of a sexp.
    Since `forward-sexp' calls a user-defined function which can
    behave unpredictably, I think the best thing is to wrap something
    (i.e. `find-tag-default' or all its callers) in condition-case.

Ok, now that I see the precise problem, I agree with you.