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bzrlib/branch.py
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        if revision_id is None:
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            revno, revision_id = self.last_revision_info()
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        else:
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            revno = self.revision_id_to_revno(revision_id)
 
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            # To figure out the revno for a random revision, we need to build
 
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            # the revision history, and count its length.
 
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            # We don't care about the order, just how long it is.
 
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            # Alternatively, we could start at the current location, and count
 
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            # backwards. But there is no guarantee that we will find it since
 
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            # it may be a merged revision.
 
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            revno = len(list(self.repository.iter_reverse_revision_history(
 
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                                                                revision_id)))
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        destination.set_last_revision_info(revno, revision_id)
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    def _make_tags(self):