doc-src/TutorialI/Trie/Option2.thy
author wenzelm
Wed, 09 Aug 2000 21:13:42 +0200
changeset 9567 48f63548af46
parent 8771 026f37a86ea7
permissions -rw-r--r--
added Bauer-Wenzel:2000:HB;

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

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