diff --git a/src/PhpGenerator/Closure.php b/src/PhpGenerator/Closure.php
index 398e1491..43f26e1f 100644
--- a/src/PhpGenerator/Closure.php
+++ b/src/PhpGenerator/Closure.php
@@ -9,18 +9,12 @@
 
 namespace Nette\PhpGenerator;
 
-use Nette;
-
 
 /**
  * Closure.
- *
- * @property-deprecated string $body
  */
-final class Closure
+final class Closure extends FunctionLike
 {
-	use Nette\SmartObject;
-	use Traits\FunctionLike;
 	use Traits\AttributeAware;
 
 	/** @var Parameter[] */
diff --git a/src/PhpGenerator/Extractor.php b/src/PhpGenerator/Extractor.php
index 0be2d2d8..836853c3 100644
--- a/src/PhpGenerator/Extractor.php
+++ b/src/PhpGenerator/Extractor.php
@@ -385,7 +385,7 @@ private function addCommentAndAttributes($element, Node $node): void
 	}
 
 
-	private function setupFunction(GlobalFunction|Method $function, Node\FunctionLike $node): void
+	private function setupFunction(FunctionLike $function, Node\FunctionLike $node): void
 	{
 		$function->setReturnReference($node->returnsByRef());
 		$function->setReturnType($node->getReturnType() ? $this->toPhp($node->getReturnType()) : null);
diff --git a/src/PhpGenerator/Factory.php b/src/PhpGenerator/Factory.php
index 33c6f115..c8193a59 100644
--- a/src/PhpGenerator/Factory.php
+++ b/src/PhpGenerator/Factory.php
@@ -194,7 +194,7 @@ public function fromFunctionReflection(\ReflectionFunction $from, bool $withBody
 	}
 
 
-	public function fromCallable(callable $from): Method|GlobalFunction|Closure
+	public function fromCallable(callable $from): FunctionLike
 	{
 		$ref = Nette\Utils\Callback::toReflection($from);
 		return $ref instanceof \ReflectionMethod
diff --git a/src/PhpGenerator/Traits/FunctionLike.php b/src/PhpGenerator/FunctionLike.php
similarity index 94%
rename from src/PhpGenerator/Traits/FunctionLike.php
rename to src/PhpGenerator/FunctionLike.php
index c0b33f99..7d6d0879 100644
--- a/src/PhpGenerator/Traits/FunctionLike.php
+++ b/src/PhpGenerator/FunctionLike.php
@@ -7,20 +7,22 @@
 
 declare(strict_types=1);
 
-namespace Nette\PhpGenerator\Traits;
+namespace Nette\PhpGenerator;
 
 use JetBrains\PhpStorm\Language;
 use Nette;
-use Nette\PhpGenerator\Dumper;
-use Nette\PhpGenerator\Parameter;
 use Nette\Utils\Type;
 
 
 /**
- * @internal
+ * GlobalFunction/Closure/Method description.
+ *
+ * @property-deprecated string $body
  */
-trait FunctionLike
+abstract class FunctionLike
 {
+	use Nette\SmartObject;
+
 	private string $body = '';
 
 	/** @var Parameter[] */
diff --git a/src/PhpGenerator/GlobalFunction.php b/src/PhpGenerator/GlobalFunction.php
index ae1e4f88..76393715 100644
--- a/src/PhpGenerator/GlobalFunction.php
+++ b/src/PhpGenerator/GlobalFunction.php
@@ -9,18 +9,12 @@
 
 namespace Nette\PhpGenerator;
 
-use Nette;
-
 
 /**
  * Global function.
- *
- * @property-deprecated string $body
  */
-final class GlobalFunction
+final class GlobalFunction extends FunctionLike
 {
-	use Nette\SmartObject;
-	use Traits\FunctionLike;
 	use Traits\NameAware;
 	use Traits\CommentAware;
 	use Traits\AttributeAware;
diff --git a/src/PhpGenerator/Method.php b/src/PhpGenerator/Method.php
index 0596658c..2c636a48 100644
--- a/src/PhpGenerator/Method.php
+++ b/src/PhpGenerator/Method.php
@@ -14,13 +14,9 @@
 
 /**
  * Class method.
- *
- * @property-deprecated string|null $body
  */
-final class Method
+final class Method extends FunctionLike
 {
-	use Nette\SmartObject;
-	use Traits\FunctionLike;
 	use Traits\NameAware;
 	use Traits\VisibilityAware;
 	use Traits\CommentAware;
@@ -92,7 +88,11 @@ public function addPromotedParameter(string $name, mixed $defaultValue = null):
 			$param->setDefaultValue($defaultValue);
 		}
 
-		return $this->parameters[$name] = $param;
+		$params = $this->getParameters();
+		$params[$name] = $param;
+		$this->setParameters($params);
+
+		return $param;
 	}
 
 
diff --git a/src/PhpGenerator/Printer.php b/src/PhpGenerator/Printer.php
index c7005fe1..4e0f3ee3 100644
--- a/src/PhpGenerator/Printer.php
+++ b/src/PhpGenerator/Printer.php
@@ -385,7 +385,7 @@ protected function printDocComment(/*Traits\CommentAware*/ $commentable): string
 	}
 
 
-	private function printReturnType(Closure|GlobalFunction|Method $function): string
+	private function printReturnType(FunctionLike $function): string
 	{
 		return ($tmp = $this->printType($function->getReturnType(), $function->isReturnNullable()))
 			? $this->returnTypeColon . $tmp