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From: Glenn Morris <rgm@gnu.org>
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Subject: Re: Problem with `dir-locals-set-class-variables'
Date: Wed, 11 Apr 2012 12:36:43 -0400
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AFAICS, this feature simply doesn't work, for a variety of reasons.
You might like to file a bug report about it.
The first form that does work seems fine to me, so I don't see that the
second form needs to exist, so I think it should probably just be
undocumented.