[MERGE] deprecated EmptyTree

[Robert Collins]

On Thu, 2006-07-20 at 10:32 -0400, Aaron Bentley wrote:
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> Robert Collins wrote:
> > This patch deprecated EmptyTree, replacing all uses of it with a
> > RevisionTree.
> 
> I like the concept.  I don't like using Inventory this way, because it
> produces an Inventory with a tree root, and the NULL_REVISION doesn't
> have a tree root.
> 
> In nested-trees, I'm using Inventory(None) to produce an inventory with
> no tree root, and using Inventory() to produce an inventory whose root
> is TREE_ROOT.

Can you expand on this? When does a tree get a root?

Rob

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