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doc-src/TutorialI/Trie/Option2.thy
author
wenzelm
Thu, 29 Jun 2000 22:31:29 +0200
changeset 9194
a57987e0250b
parent 8771
026f37a86ea7
permissions
-rw-r--r--
added add_method;
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)