doc-src/TutorialI/Trie/Option2.thy
author wenzelm
Wed, 18 Oct 2000 23:58:07 +0200
changeset 10267 325ead6d9457
parent 8771 026f37a86ea7
permissions -rw-r--r--
updated;

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

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