doc-src/TutorialI/Trie/Option2.thy
author kleing
Tue, 18 Jul 2000 13:16:48 +0200
changeset 9381 a0491eed2270
parent 8771 026f37a86ea7
permissions -rw-r--r--
MicroJava structure changed

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

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