doc-src/TutorialI/Trie/Option2.thy
author wenzelm
Tue, 01 Aug 2000 13:43:22 +0200
changeset 9490 c2606af9922c
parent 8771 026f37a86ea7
permissions -rw-r--r--
tuned msg;

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

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