function q(): void {
    $a = 2 ** 2;

    $b = 1 ? 2 : 3;

    $c = 1 ? 2 ? 3 : 4 : 5;

    $d = 1 ?: 2 ?: 3;

    $e = 1 ?? 2;

    $f = 1 ?? 2 ?? 3;
}