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doc-src/TutorialI/Trie/Option2.thy
author
wenzelm
Mon, 13 Nov 2000 21:59:49 +0100
changeset 10463
474263d29057
parent 8771
026f37a86ea7
permissions
-rw-r--r--
tuned IsarThy.theorem_i;
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)