The post goes on to explain it, was there something specific about that that's confusing?
Now that I think about it, maybe it has to do with `unsafe` block so the compiler doesn't check it.
My next question would be why does it need `unsafe`?
> why does it need `unsafe`?
slice::from_raw_parts_mut is an unsafe function because it lets you conjure a slice from thin air; there's no checking of it at all.
This function is used because it's the most straightforward way of accomplishing the task.