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doc-src/TutorialI/Trie/Option2.thy
author
paulson
Mon, 06 Nov 2000 16:41:39 +0100
changeset 10397
e2d0dda41f2c
parent 8771
026f37a86ea7
permissions
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(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)