doc-src/TutorialI/Trie/Option2.thy
author nipkow
Mon, 27 Nov 2000 16:40:56 +0100
changeset 10524 270b285d48ee
parent 8771 026f37a86ea7
permissions -rw-r--r--
*** empty log message ***

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

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