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doc-src/TutorialI/Trie/Option2.thy
author
wenzelm
Tue, 25 Jul 2000 00:02:52 +0200
changeset 9434
d2fa043ab24f
parent 8771
026f37a86ea7
permissions
-rw-r--r--
do nat pass theory value, but sg_ref;
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)