[MERGE] Turn record_iter_changes into a generator to emit file system hashes.

[Robert Collins]

On Thu, 2009-03-26 at 11:14 -0500, John Arbash Meinel wrote:


> UnsupportedOperation(self._generate_inventory,...) doesn't seem quite
> right. Is that correct?

Its a bit of a bodge; other things expect UnsupportedOperation, so I
wanted to raise that, but its constructor really wants a method and
instance.

-Rob
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