# File lib/rspec/mocks/method_double.rb, line 147
      def add_negative_expectation(error_generator, expectation_ordering, expected_from, &implementation)
        configure_method
        expectation = NegativeMessageExpectation.new(error_generator, expectation_ordering, expected_from, @method_name, &implementation)
        expectations.unshift expectation
        expectation
      end