# File lib/rspec/core/example_group.rb, line 327
      def self.run_before_all_hooks(example_group_instance)
        return if descendant_filtered_examples.empty?
        begin
          assign_before_all_ivars(superclass.before_all_ivars, example_group_instance)

          BeforeAllMemoizedHash.isolate_for_before_all(example_group_instance) do
            run_hook(:before, :all, example_group_instance)
          end
        ensure
          store_before_all_ivars(example_group_instance)
        end
      end