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doc-src/TutorialI/Trie/Option2.thy
author
wenzelm
Tue, 13 Jun 2000 18:34:59 +0200
changeset 9060
b0dd884b1848
parent 8771
026f37a86ea7
permissions
-rw-r--r--
rename @case to _case_syntax (improves on low-level errors);
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)