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doc-src/TutorialI/Trie/Option2.thy
author
paulson
Thu, 10 Aug 2000 11:27:34 +0200
changeset 9570
e16e168984e1
parent 8771
026f37a86ea7
permissions
-rw-r--r--
installation of cancellation simprocs for the integers
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)