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doc-src/TutorialI/Trie/Option2.thy
author
nipkow
Fri, 15 Sep 2000 19:59:05 +0200
changeset 9992
4281ccea43f0
parent 8771
026f37a86ea7
permissions
-rw-r--r--
*** empty log message ***
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)