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doc-src/TutorialI/Trie/Option2.thy
author
wenzelm
Wed, 15 Nov 2000 19:42:33 +0100
changeset 10471
040de0b97b72
parent 8771
026f37a86ea7
permissions
-rw-r--r--
updated;
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)