doc-src/TutorialI/Trie/Option2.thy
author nipkow
Tue, 29 Aug 2000 16:05:13 +0200
changeset 9723 a977245dfc8a
parent 8771 026f37a86ea7
permissions -rw-r--r--
*** empty log message ***

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

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