private static String toString(List<VespaGroupingStep> steps) {
        List<String> actual = new ArrayList<>(steps.size());
        for (VespaGroupingStep step : steps)
            actual.add(step.continuations().toString() + step.getOperation());
        return actual.toString();
    }
Verifies that we can search for a backslash
container-search/src/test/java/com/yahoo/search/yql/YqlParserTestCase.java