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src/HOL/Option.thy
author paulson
Wed, 23 Jul 1997 11:52:22 +0200
changeset 3564 f886dbd91ee5
parent 2019 b45d9f2042e0
child 4133 0a08c2b9b1ed
permissions -rw-r--r--
Now Datatype.occs_in_prems prints the necessary warning ITSELF. It is also easier to invoke and even works if the induction variable is a parameter (rather than a free variable).
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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















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