Ordering<Number> c = objects.compound(numbers);

    Ordering<Integer> d = numbers.compound(integers);
    Ordering<Integer> e = integers.compound(numbers);

    // This works with three levels too (IDEA falsely reports errors as noted
    // below. Both javac and eclipse handle these cases correctly.)

    Ordering<Number> f = numbers.compound(objects).compound(objects); // bad IDEA

    Ordering<Number> c = objects.compound(numbers);

    Ordering<Integer> d = numbers.compound(integers);
    Ordering<Integer> e = integers.compound(numbers);

    // This works with three levels too (IDEA falsely reports errors as noted
    // below. Both javac and eclipse handle these cases correctly.)

    Ordering<Number> f = numbers.compound(objects).compound(objects); // bad IDEA