type fixes

Author: dg

src/PhpGenerator/ClassType.php

@@ -50,7 +50,7 @@ final class ClassType
 	/** @var string[] */
 	private $implements = [];
 
-	/** @var string[] */
+	/** @var array[] */
 	private $traits = [];
 
 	/** @var Constant[] name => Constant */
@@ -422,7 +422,7 @@ public function addMethod(string $name): Method
 	}
 
 
-	private function validate(array $names)
+	private function validate(array $names): void
 	{
 		foreach ($names as $name) {
 			if (!Helpers::isNamespaceIdentifier($name, true)) {

src/PhpGenerator/Method.php

@@ -79,7 +79,7 @@ public function __toString(): string
 	 */
 	public function setBody(?string $code, array $args = null): self
 	{
-		$this->body = $args === null ? $code : Helpers::formatArgs($code, $args);
+		$this->body = $args === null || $code === null ? $code : Helpers::formatArgs($code, $args);
 		return $this;
 	}