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doc-src/TutorialI/Trie/Option2.thy
author
nipkow
Fri, 28 Jul 2000 16:02:51 +0200
changeset 9458
c613cd06d5cf
parent 8771
026f37a86ea7
permissions
-rw-r--r--
apply. -> by
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)