{ Let new. new Let push queue item. { Let incoming. (item::queue.incoming) Let outgoing. queue.outgoing } Define pop queue. Match queue.outgoing | `cons.{item outgoing} Let queue. { Let incoming. queue.incoming Let outgoing. outgoing } In `just.{item queue} | `nil Match queue.incoming | `nil `nothing | _ Goto (pop $ new $ LIST.reverse queue.incoming) ; ; } Where Let new init. { Let incoming. [] Let outgoing. init } Where Let LIST. Package "list"