# File lib/mocha/mock.rb, line 315
    def respond_to_missing?(symbol, include_private = false)
      if @responder
        if @responder.method(:respond_to?).arity > 1
          @responder.respond_to?(symbol, include_private)
        else
          @responder.respond_to?(symbol)
        end
      else
        @everything_stubbed || all_expectations.matches_method?(symbol)
      end
    end