Fix namespace

Author: VincentLanglet

tests/PHPStan/Rules/Functions/CallToFunctionParametersRuleTest.php

@@ -539,12 +539,12 @@ public function testBug13719(): void
 	{
 		$this->analyse([__DIR__ . '/data/bug-13719.php'], [
 			[
-				'Unknown parameter $greetings in call to function non_variadic.',
-				18,
+				'Unknown parameter $greetings in call to function Bug13719\non_variadic.',
+				20,
 			],
 			[
-				'Unknown parameter $greetings in call to function implicit_variadic.',
-				25,
+				'Unknown parameter $greetings in call to function Bug13719\implicit_variadic.',
+				27,
 			],
 		]);
 	}

tests/PHPStan/Rules/Functions/data/bug-13719.php

@@ -1,5 +1,7 @@
 <?php declare(strict_types = 1);
 
+namespace Bug13719;
+
 function non_variadic(string $name, ?string $greeting = null): void {
 	var_dump($name);
 }