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doc-src/TutorialI/Trie/Option2.thy
author
wenzelm
Mon, 23 Oct 2000 22:10:36 +0200
changeset 10309
a7f961fb62c6
parent 8771
026f37a86ea7
permissions
-rw-r--r--
intro_classes by default;
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)