Infinite Mining Turtle (on the server we have coal off)

On my server, we had accidentally coded in an infinite mining turtle while setting up a farm. One of my friends has a lot of experience with computercraft and he couldn't see the problem… The Code –> http://pastebin.com/8iuP0Kve

So I'm assuming that the selected slot when you first start this up is 1. That being said, while you mine, slot 1 is getting filled up first. it looks like that in order for your program to progress, you have to have 0 items in slot 1. That won't happen if that's the first slot to fill up. So you will never make it to slot 16, never breaking the loop.