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From: Rod Kay <rodakay@internode.on.net>
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Subject: Re: Gnat: broken dispatch tables for interface types ?
Date: Mon, 9 Jul 2012 00:46:36 -0700 (PDT)
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Date: 2012-07-09T00:46:36-07:00
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> One thing though is that you should not derive new tagged types in bodies.

So it seems. Moving the derivation to a spec and problem disappears. Many thanks !