Method isRock

examples/demo.php:5046–5049

@phpstan-assert-if-true Rock $value */

(mixed $value)

    /** @phpstan-assert-if-true Rock $value */
    public static function isRock(mixed $value): bool
    {
        return $value instanceof Rock;
    }

    /** @phpstan-assert-if-false Rock $value */
    public static function isNotRock(mixed $value): bool