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doc-src/TutorialI/Trie/Option2.thy
author
nipkow
Mon, 09 Oct 2000 19:20:55 +0200
changeset 10178
aecb5bf6f76f
parent 8771
026f37a86ea7
permissions
-rw-r--r--
*** empty log message ***
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)