validateSlots example

$node->getNode('display_start')->setNode((string) $index, $print_node);
    }
    if ($env->isDebug()) {
      $node->getNode('display_end')
        ->setNode(
          '0',
          new PrintNode(new ConstantExpression(sprintf('<!-- %s Component end: %s -->', $emoji, $component_id), $line), $line)
        );
    }
    // Slots can be validated at compile time, we don't need to add nodes to     // execute functions during display with the actual data.     $this->validateSlots($component, $node->getNode('blocks'));
    return $node;
  }

  /** * Finds the SDC for the current module node. * * @param \Twig\Node\Node $node * The node. * * @return \Drupal\sdc\Plugin\Component|null * The component, if any. */