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doc-src/TutorialI/Trie/Option2.thy
author
paulson
Thu, 12 Oct 2000 12:15:59 +0200
changeset 10196
4d1af711cf7b
parent 8771
026f37a86ea7
permissions
-rw-r--r--
new I-rules r_into_rtrancl, r_into_trancl and a simpler proof
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)