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doc-src/TutorialI/Trie/Option2.thy
author
wenzelm
Fri, 01 Sep 2000 00:48:12 +0200
changeset 9780
d25d6a977ea6
parent 8771
026f37a86ea7
permissions
-rw-r--r--
added 'safe' method; 'auto' method: optional parms;
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)