Make Node abstract

src/Node/Node.php

@@ -24,7 +24,7 @@ use Twig\Source;
  * @implements \IteratorAggregate<int|string, Node>
  */
 #[YieldReady]
-class Node implements \Countable, \IteratorAggregate
+abstract class Node implements \Countable, \IteratorAggregate
 {
     /**
      * @var array<string|int, Node>
@@ -48,10 +48,6 @@ class Node implements \Countable, \IteratorAggregate
      */
     public function __construct(array $nodes = [], array $attributes = [], int $lineno = 0)
     {
-        if (self::class === static::class) {
-            trigger_deprecation('twig/twig', '3.15', \sprintf('Instantiating "%s" directly is deprecated; the class will become abstract in 4.0.', self::class));
-        }
-
         foreach ($nodes as $name => $node) {
             if (!$node instanceof self) {
                 throw new \InvalidArgumentException(\sprintf('Using "%s" for the value of node "%s" of "%s" is not supported. You must pass a \Twig\Node\Node instance.', \is_object($node) ? $node::class : (null === $node ? 'null' : \gettype($node)), $name, static::class));