doc-src/TutorialI/Trie/Option2.thy
author paulson
Mon, 23 Oct 2000 17:38:07 +0200
changeset 10302 74be38751d06
parent 8771 026f37a86ea7
permissions -rw-r--r--
fixed crossref

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

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