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doc-src/TutorialI/Trie/Option2.thy
author
wenzelm
Tue, 03 Oct 2000 01:15:11 +0200
changeset 10132
8e9a8ede2f11
parent 8771
026f37a86ea7
permissions
-rw-r--r--
updated;
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)