S1452: java Collectors second parameter should be excluded

class Scratch {
    public static Collector<Integer, ?, Integer> summing() {
        return Collector.of(
                () -> new int[1],
                (a, t) -> a[0] += t,
                (a, b) -> {
                    a[0] += b[0];
                    return a;
                },
                a -> a[0]
        );
    }
}