Small patch for CHK branch to fix some tests

[Robert Collins]

On Tue, 2008-11-04 at 13:40 +1100, Andrew Bennetts wrote:
> Hi Robert,
> 
> I haven't run the full suite, but this patch appears to help at least
> test_upgrade_preserves_signatures, and makes one variant of test_fetch_knit3 get
> a little further along too.  I bumped into these yesterday while playing with
> usertest on your branch.

Setting the children directly is not permitted in the new code; allowing
that would be more than a little complex. So I'm not inclined to merge
that part of the patch without more understanding of what is failing and
why.

The other change would seem to be a no-op, could you expand on why its
needed?

-Rob
-- 
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