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doc-src/TutorialI/Trie/Option2.thy
author
wenzelm
Sat, 18 Nov 2000 19:46:48 +0100
changeset 10491
e4a408728012
parent 8771
026f37a86ea7
permissions
-rw-r--r--
quot_cond_function: simplified, support conditional definition;
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)