# File lib/chef/cookbook/cookbook_version_loader.rb, line 112
      def merge!(other_cookbook_loader)
        other_cookbook_settings = other_cookbook_loader.cookbook_settings
        @cookbook_settings.each do |file_type, file_list|
          file_list.merge!(other_cookbook_settings[file_type])
        end
        @metadata_filenames.concat(other_cookbook_loader.metadata_filenames)
      end