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"""Upgrade v0.0.4 tree containing ghost references.
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That is, some of the parents of revisions mentioned in the branch
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This shouldn't normally happen in branches created entirely in
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self.build_tree_contents(_ghost_template)
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revision_id = b.revision_history()[1]
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eq(len(rev.parent_ids), 2)
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eq(rev.parent_ids[1], 'wibble@wobble-2')