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        raise NotImplementedError('pull is abstract')
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    def basis_tree(self):
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        """Return `Tree` object for last revision.
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        If there are no revisions yet, return an `EmptyTree`.
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        """
 
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        """Return `Tree` object for last revision."""
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        return self.repository.revision_tree(self.last_revision())
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    def rename_one(self, from_rel, to_rel):