# File lib/rubyrep/syncers/two_way_syncer.rb, line 76
      def validate_conflict_handling_option(option)
        unless option.respond_to? :call
          unless [:ignore, :right_wins, :left_wins].include? option
            raise ArgumentError.new("#{option.inspect} not a valid :sync_conflict_handling option")
          end
        end
      end