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# Make stackable source branch with an unstackable repo format.
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source_bzrdir = self.make_bzrdir('source')
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pack_repo.RepositoryFormatKnitPack1().initialize(source_bzrdir)
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# Make a directory with a default stacking policy
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parent_bzrdir = self.make_bzrdir('parent')
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stacked_on = self.make_branch('parent/stacked-on', format='pack-0.92')