Added regression test

Author: staabm

tests/PHPStan/Rules/Methods/CallMethodsRuleTest.php

@@ -3616,4 +3616,13 @@ public function testBug12880(): void
 		$this->analyse([__DIR__ . '/data/bug-12880.php'], []);
 	}
 
+	public function testBug12940(): void
+	{
+		$this->checkThisOnly = false;
+		$this->checkNullables = true;
+		$this->checkUnionTypes = true;
+		$this->checkExplicitMixed = true;
+
+		$this->analyse([__DIR__ . '/data/bug-12940.php'], []);
+	}
 }

tests/PHPStan/Rules/Methods/data/bug-12940.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Bug12940;
+
+class GeneralUtility
+{
+	/**
+	 * @template T of object
+	 * @param class-string<T> $className
+	 * @return T
+	 */
+	public static function makeInstance(string $className, mixed ...$args): object
+	{
+		return new $className(...$args);
+	}
+}
+
+class PageRenderer
+{
+	public function setTemplateFile(string $path): void
+	{
+	}
+
+	public function setLanguage(string $lang): void
+	{
+	}
+}
+
+class TypoScriptFrontendController
+{
+
+	protected ?PageRenderer $pageRenderer = null;
+
+	public function initializePageRenderer(): void
+	{
+		if ($this->pageRenderer !== null) {
+			return;
+		}
+		$this->pageRenderer = GeneralUtility::makeInstance(PageRenderer::class);
+		$this->pageRenderer->setTemplateFile('EXT:frontend/Resources/Private/Templates/MainPage.html');
+		$this->pageRenderer->setLanguage('DE');
+	}
+}