src/HOL/IOA/meta_theory/Option.thy
author paulson
Tue, 16 Jul 1996 15:49:46 +0200
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Put in minimal simpset to avoid excessive simplification, just as in revision 1.9 of HOL/indrule.ML
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(*  Title:      Option.thy
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    ID:         $Id$
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    Author:     Tobias Nipkow
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    Copyright   1994  TU Muenchen
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Datatype 'a option
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*)
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Option = Arith +
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datatype 'a option = None | Some ('a)
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end