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doc-src/TutorialI/Trie/Option2.thy
author
wenzelm
Fri, 05 May 2000 22:23:27 +0200
changeset 8809
85539b33be03
parent 8771
026f37a86ea7
permissions
-rw-r--r--
updated;
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)