# File lib/arel/visitors/visitor.rb, line 18
      def visit object
        send dispatch[object.class], object
      rescue NoMethodError => e
        raise e if respond_to?(dispatch[object.class], true)
        superklass = object.class.ancestors.find { |klass|
          respond_to?(dispatch[klass], true)
        }
        raise(TypeError, "Cannot visit #{object.class}") unless superklass
        dispatch[object.class] = dispatch[superklass]
        retry
      end