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doc-src/TutorialI/Trie/Option2.thy
author
wenzelm
Mon, 02 Oct 2000 14:22:39 +0200
changeset 10121
fb9be005cc44
parent 8771
026f37a86ea7
permissions
-rw-r--r--
export get_datatypes_sg; added weak_case_congs_of(_sg);
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)