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From: Per Abrahamsen <abraham@dina.kvl.dk>
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Subject: Re: Creating recursive customization types / widgets
Date: Tue, 02 Dec 2003 14:34:33 +0100
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David Kastrup <dak@gnu.org> writes:

> It is conceivable, for example, that the exact type depends on the
> value of a different variable, or the availability of some feature
> at run-time.  One could use that widget even in that case, and it
> would have nothing to do with recursion.

I don't know if that would work.  The :type value isn't evaluated like
a Lisp expression, it is expanded in widget specific ways.