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doc-src/TutorialI/Trie/Option2.thy
author
paulson
Wed, 24 May 2000 18:49:05 +0200
changeset 8962
633e1682455c
parent 8771
026f37a86ea7
permissions
-rw-r--r--
setsum is now overloaded on plus_ac0
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)