def devaluate(actual, expected)
      if actual.respond_to?(expected)
        fail(expected_message.method(expected).is_defined)
      else
        pass new_message.responds_to(expected)
      end
    end
def devaluate(actual, expected)
      if actual.respond_to?(expected)
        fail(expected_message.method(expected).is_defined)
      else
        pass new_message.responds_to(expected)
      end
    end
(see Riot::AssertionMacro#devaluate)
 @param [Symbol, String] expected the method name that actual should not respond to