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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Enhancements to "minor-mode-map-alist" functionality.
Date: Wed, 1 May 2002 01:14:35 -0600 (MDT)
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    It is a list of alists with the same format and interpretation as
    minor-mode-map-alist.

Would a single added alist do the job?

    Alternatively, an element may look like (lambda . FORM) where FORM is 
    evaluated and should return either nil or a cons (SYMBOL . KEYMAP);

That seems kludgy and ugly.  I would rather allow replacing VARIABLE
with a boolean expression.  Wouldn't that be enough?

I think this is the sort of area where it is better to make smaller
extensions, not larger ones.