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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Warning: `mapcar' called for effect; use `mapc' or `dolist'
Date: Tue, 23 Oct 2007 06:39:11 -0400
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To: Reiner Steib <Reiner.Steib@gmx.de>
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    >   > (defun gnus-group-highlight-line ()
    >   >   "Highlight the current line according to `gnus-group-highlight'."
    [...]
    > It seems that `mailp' is not used in that function. 

    `mailp' is used implicitly through the variable `gnus-group-highlight'
    which is let-bound to `list'.  `list' is used in the body of the
    let-form.

That code is a terrible crock.  Would you please rewrite it to make it
clearer?

I added a `risky-local-variable' property to `gnus-group-highlight'.
Are there any other such variables in Gnus which contain forms to
evaluate?