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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Rewriting gnus-group-highlight-line (was: Warning: `mapcar' called for effect; use `mapc' or `dolist')
Date: Sat, 27 Oct 2007 19:41:20 -0400
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To: Reiner Steib <Reiner.Steib@gmx.de>
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    I'm not sure if I understand what exactly should be rewritten in this
    function: The use of `mailp' through `gnus-group-highlight', the
    accessing `gnus-group-highlight' through `list', both, or something
    else.

The kludge is that the alist elements contain expressions that refer
to local variables with short names.  Perhaps write your own tiny
evaluator that handles just `and', `or', and numeric comparisons
and just a few specific variables.