The bin that works like a queue

What is this ?

Kyubin works like a queue with a capacity of only one item.

To see what is inside the queue, you have to append an item to it. Doing so pops the previous item for you to read and replaces it with the one you just pushed.

Simple rules can create complex behaviours and I wanted to see what people could create with this.

What's the stack ?

Go + Storm