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rev_id_iterator = _get_sorted_revisions(merge, merge_extra,
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branch.repository.get_parent_map(merge_extra))
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num, first, depth, eom = rev_id_iterator.next()
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num, first, depth, eom = next(rev_id_iterator)
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raise AssertionError('Somehow we misunderstood how'
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' iter_topo_order works %s != %s' % (first, merge))