# File lib/rspec/core/example_group.rb, line 237
      def self.set_it_up(*args)
        # Ruby 1.9 has a bug that can lead to infinite recursion and a
        # SystemStackError if you include a module in a superclass after
        # including it in a subclass: https://gist.github.com/845896
        # To prevent this, we must include any modules in RSpec::Core::ExampleGroup
        # before users create example groups and have a chance to include
        # the same module in a subclass of RSpec::Core::ExampleGroup.
        # So we need to configure example groups here.
        ensure_example_groups_are_configured

        symbol_description = args.shift if args.first.is_a?(Symbol)
        args << build_metadata_hash_from(args)
        args.unshift(symbol_description) if symbol_description
        @metadata = RSpec::Core::Metadata.new(superclass_metadata).process(*args)
        world.configure_group(self)
      end