doc-src/TutorialI/Trie/Option2.thy
author wenzelm
Thu, 12 Oct 2000 18:09:06 +0200
changeset 10211 1bece7f35762
parent 8771 026f37a86ea7
permissions -rw-r--r--
updated;

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

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