doc-src/TutorialI/Trie/Option2.thy
author wenzelm
Tue, 12 Sep 2000 22:13:23 +0200
changeset 9941 fe05af7ec816
parent 8771 026f37a86ea7
permissions -rw-r--r--
renamed atts: rulify to rule_format, elimify to elim_format;

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

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