[MERGE] repository external reference tests (StackedBranches)

[Robert Collins]

On Thu, 2008-06-05 at 09:02 +0200, Vincent Ladeuil wrote:
> 
> 
> Eerk ! You did the opposite ! Going from a class to a function
> doesn't seem like the best way to allow further subclassing.

Oh, I missed this - 

subclassing is a one-shot trick, composition is _much_ more flexible,
and where it is reasonable to use it I prefer to do so.

-Rob

> 
> GPG key available at: <http://www.robertcollins.net/keys.txt>.
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