doc-src/TutorialI/Trie/Option2.thy
author wenzelm
Thu, 17 Aug 2000 10:33:37 +0200
changeset 9619 6125cc9efc18
parent 8771 026f37a86ea7
permissions -rw-r--r--
fixed deps;

(*<*)
theory Option2 = Main:;
(*>*)

datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)