# File lib/rspec/core/example_group.rb, line 274
      def self.run_before_all_hooks(example_group_instance)
        return if descendant_filtered_examples.empty?
        assign_before_all_ivars(superclass.before_all_ivars, example_group_instance)
        world.run_hook_filtered(:before, :all, self, example_group_instance)
        run_hook!(:before, :all, example_group_instance)
        store_before_all_ivars(example_group_instance)
      end