7d68cbdff0
This makes it possible to pass the location of that space through to nested blocks, resulting in less copying, taking, and dropping. This makes the compiler slightly faster and 19k smaller. A FIXME is to use 'move' semantics when returning the values from the block -- don't bump the refcount and drop it again for the returning block, but simply assign ownership to the receiver. To do this, we'll need a way to (safely) scrub things from a block's cleanup list.
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