doc-src/TutorialI/Trie/Option2.thy
author wenzelm
Tue, 03 Oct 2000 18:55:23 +0200
changeset 10140 ba9297b71897
parent 8771 026f37a86ea7
permissions -rw-r--r--
major cleanup -- improved typesetting;

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

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