[MERGE] trees - add get_parent_ids

[John Arbash Meinel]

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Aaron Bentley wrote:
> Robert Collins wrote:
>>> On Fri, 2006-06-16 at 10:01 -0400, Aaron Bentley wrote:
>>> How about I change the api to be:
>>> [] for a tree known to have no parents including EmptyTree.
>>> [revid, ...] for trees descending from non-null parents.
> 
> Sounds good.
> 
>>> raises BzrError *for now* if we do not know the parents. (When we have a
>>> use for it, we can and should create a specific exception. I'm just not
>>> sure what it should be called, and as we have no code that can generate
>>> this situation I'm hesitant about putting in an exception that may never
>>> ever be used/possible to use.
> 
> Sounds fine.
> 
> Aaron

Either 'BzrError' or a plain 'assert'. Since it is an unreachable state.

John
=:->
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