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doc-src/TutorialI/Trie/Option2.thy
author
wenzelm
Thu, 27 Jul 2000 18:25:01 +0200
changeset 9451
5c25ed3c10a0
parent 8771
026f37a86ea7
permissions
-rw-r--r--
begin_theory: store *copy* of initial theory;
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)