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From: Richard Stallman <rms@gnu.org>
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Subject: Re: backward-up-list
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backward-up-list has no way of knowing whether point is inside a
string, so it can only make an assumption--that you're not in a list.

Nowadays it may be possible to do better; there may be an efficient
way to tell whether point is in a list.  If so, it would be a good
thing to implement something better.

Stefan, can we determine this efficiently using your newer syntax
parsing features?