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doc-src/TutorialI/Trie/Option2.thy
author wenzelm
Tue, 25 Jul 2000 00:01:46 +0200
changeset 9433 ac20534ce4d1
parent 8771 026f37a86ea7
permissions -rw-r--r--
avoid referencing thy value; rename_numerals: use implicit theory context; eliminated some simpset_of Int.thy (why needed anyway?);
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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