doc-src/TutorialI/Trie/Option2.thy
author nipkow
Wed, 25 Oct 2000 18:24:33 +0200
changeset 10328 bf33cbd76c05
parent 8771 026f37a86ea7
permissions -rw-r--r--
*** empty log message ***

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

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