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doc-src/TutorialI/Trie/Option2.thy
author
paulson
Wed, 25 Oct 2000 17:44:59 +0200
changeset 10327
19214ac381cf
parent 8771
026f37a86ea7
permissions
-rw-r--r--
inputs Even.tex
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)