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From: Per Abrahamsen <abraham@dina.kvl.dk>
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Subject: Re: How to declare a recursive customization type?
Date: Tue, 17 Dec 2002 12:23:57 +0100
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David Kastrup <David.Kastrup@t-online.de> writes:

> But how does one achieve that?  

Basically, it is as hard as writing a new primitive widget, which is
hard indeed.

I really ought to write some helper widget for recursive datatypes.