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def _revert_tree_to_revision(tree, revision, file_list, no_backup):
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rev_tree = _get_one_revision_tree('revert', revision, tree=tree)
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tree.revert(file_list, rev_tree, not no_backup, pb,
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tree.revert(file_list, rev_tree, not no_backup, None,
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class cmd_assert_fail(Command):