doc-src/TutorialI/Trie/Option2.thy
author nipkow
Tue, 17 Oct 2000 13:28:57 +0200
changeset 10236 7626cb4e1407
parent 8771 026f37a86ea7
permissions -rw-r--r--
*** empty log message ***

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

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