Avoid polluting ModuleNode::toString() with embedded templates

src/Node/ModuleNode.php

@@ -38,6 +38,11 @@ final class ModuleNode extends Node
         if (!$body instanceof BodyNode) {
             trigger_deprecation('twig/twig', '3.12', \sprintf('Not passing a "%s" instance as the "body" argument of the "%s" constructor is deprecated.', BodyNode::class, static::class));
         }
+        if (!$embeddedTemplates instanceof Node) {
+            trigger_deprecation('twig/twig', '3.21', \sprintf('Not passing a "%s" instance as the "embedded_templates" argument of the "%s" constructor is deprecated.', Node::class, static::class));
+
+            $embeddedTemplates = new Nodes($embeddedTemplates);
+        }
 
         $nodes = [
             'body' => $body,

src/Parser.php

@@ -117,7 +117,15 @@ class Parser
             $this->expressionRefs = null;
         }
 
-        $node = new ModuleNode(new BodyNode([$body]), $this->parent, new Nodes($this->blocks), new Nodes($this->macros), new Nodes($this->traits), $this->embeddedTemplates, $stream->getSourceContext());
+        $node = new ModuleNode(
+            new BodyNode([$body]),
+            $this->parent,
+            $this->blocks ? new Nodes($this->blocks) : new EmptyNode(),
+            $this->macros ? new Nodes($this->macros) : new EmptyNode(),
+            $this->traits ? new Nodes($this->traits) : new EmptyNode(),
+            $this->embeddedTemplates ? new Nodes($this->embeddedTemplates) : new EmptyNode(),
+            $stream->getSourceContext(),
+        );
 
         $traverser = new NodeTraverser($this->env, $this->visitors);