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doc-src/TutorialI/Trie/Option2.thy
author
paulson
Mon, 23 Oct 2000 16:24:52 +0200
changeset 10294
2ec9c808a8a7
parent 8771
026f37a86ea7
permissions
-rw-r--r--
the Sets chapter and theories
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)