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tree_a.merge_from_branch(tree_b.branch)
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self.build_tree_contents([('a/file',
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b'base-contents\nthis-contents\n')])
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tree_b.merge_from_branch(tree_a.branch)
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self.build_tree_contents([('b/file',
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b'base-contents\nother-contents\n')])
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tree_a.commit('', rev_id=b'rev3a')
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tree_b.commit('', rev_id=b'rev3b')
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out, err = self.run_bzr(['merge', '-d', 'a', 'b', '--lca'], retcode=1)