def METHOD_NAME():
    # Flatten attribute with several elements
    res, transformer = visit(
        """
        title =
            .foo = Bar { -foo } Baz
    """
    )
    assert len(res.attributes) == 1
    assert len(res.attributes[0].value.elements) == 1
    assert res.attributes[0].value.elements[0].value == "Bar { -foo } Baz"