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From: "Stefan Monnier" <monnier+gnu/emacs@rum.cs.yale.edu>
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Subject: Re: backward-up-list
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> I have found 'backward-up-list' not to work in some major modes when 
> point is in a string.

I'd expect it "not to work" in any major-mode.
backward-up-list as well as forward-sexp, backward-sexp, ... all
assume that the starting position is outside of any string and/or comment.
It's non-trivial to fix and sometimes people rely on the current behavior
so even if a technical solution comes around, it might be difficult
to use it because of the incompatible change in behavior.


	Stefan

PS: It "works" in text-mode simply because point cannot be in a string
    since there are no strings (or comments for that matter) in text-mode.