doc-src/TutorialI/Trie/Option2.thy
author paulson
Tue, 14 Nov 2000 17:02:36 +0100
changeset 10468 87dda999deca
parent 8771 026f37a86ea7
permissions -rw-r--r--
first version of Advanced Inductive Defs section

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

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