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doc-src/TutorialI/Trie/Option2.thy
author wenzelm
Tue, 01 Aug 2000 13:43:22 +0200
changeset 9490 c2606af9922c
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(*<*)
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theory Option2 = Main:;
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(*>*)
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datatype 'a option = None | Some 'a;








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(*<*)













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end













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(*>*)















isabelle