Fix ClassLike::$namespacedName must not be accessed before initialization

Author: ondrejmirtes

Diff for: src/Analyser/NodeScopeResolver.php

@@ -6323,7 +6323,7 @@ private function processNodesForCalledMethod($node, string $fileName, MethodRefl
 			$declaringClass = $methodReflection->getDeclaringClass();
 			if (
 				$node instanceof Node\Stmt\Class_
-				&& $node->namespacedName !== null
+				&& isset($node->namespacedName)
 				&& $declaringClass->getName() === (string) $node->namespacedName
 				&& $declaringClass->getNativeReflection()->getStartLine() === $node->getStartLine()
 			) {

Diff for: src/Dependency/DependencyResolver.php

@@ -43,7 +43,7 @@ public function resolveDependencies(Node $node, Scope $scope): NodeDependencies
 		$dependenciesReflections = [];
 
 		if ($node instanceof Node\Stmt\Class_) {
-			if ($node->namespacedName !== null) {
+			if (isset($node->namespacedName)) {
 				$this->addClassToDependencies($node->namespacedName->toString(), $dependenciesReflections);
 			}
 			if ($node->extends !== null) {

Diff for: tests/PHPStan/Analyser/AnalyserIntegrationTest.php

@@ -1505,6 +1505,12 @@ public function testBug12549(): void
 		$this->assertNoErrors($errors);
 	}
 
+	public function testBug12627(): void
+	{
+		$errors = $this->runAnalyse(__DIR__ . '/data/bug-12627.php');
+		$this->assertNoErrors($errors);
+	}
+
 	/**
 	 * @param string[]|null $allAnalysedFiles
 	 * @return Error[]

Diff for: tests/PHPStan/Analyser/data/bug-12627.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Bug12627;
+
+class A
+{
+	public function a(): void
+	{
+		$this->b();
+	}
+
+	private function b(): void
+	{
+	}
+}
+
+$c = new class() {};