doc-src/TutorialI/Trie/Option2.thy
author nipkow
Wed, 11 Oct 2000 09:09:06 +0200
changeset 10186 499637e8f2c6
parent 8771 026f37a86ea7
permissions -rw-r--r--
*** empty log message ***

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

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