UnusedPrivatePropertyRule - recognize static properties fetched on expr

src/Rules/DeadCode/UnusedPrivateMethodRule.php

@@ -82,10 +82,11 @@ public function processNode(Node $node, Scope $scope): array
 			if ($methodCallNode instanceof Node\Expr\MethodCall) {
 				$calledOnType = $callScope->getType($methodCallNode->var);
 			} else {
-				if (!$methodCallNode->class instanceof Node\Name) {
-					continue;
+				if ($methodCallNode->class instanceof Node\Name) {
+					$calledOnType = $callScope->resolveTypeByName($methodCallNode->class);
+				} else {
+					$calledOnType = $callScope->getType($methodCallNode->class);
 				}
-				$calledOnType = $scope->resolveTypeByName($methodCallNode->class);
 			}
 
 			$inMethod = $callScope->getFunction();

src/Rules/DeadCode/UnusedPrivatePropertyRule.php

@@ -130,11 +130,11 @@ public function processNode(Node $node, Scope $scope): array
 			if ($fetch instanceof Node\Expr\PropertyFetch) {
 				$fetchedOnType = $usage->getScope()->getType($fetch->var);
 			} else {
-				if (!$fetch->class instanceof Node\Name) {
-					continue;
+				if ($fetch->class instanceof Node\Name) {
+					$fetchedOnType = $usage->getScope()->resolveTypeByName($fetch->class);
+				} else {
+					$fetchedOnType = $usage->getScope()->getType($fetch->class);
 				}
-
-				$fetchedOnType = $usage->getScope()->resolveTypeByName($fetch->class);
 			}
 
 			foreach ($propertyNames as $propertyName) {

tests/PHPStan/Rules/DeadCode/UnusedPrivatePropertyRuleTest.php

@@ -279,4 +279,11 @@ public function testBug8850(): void
 		$this->analyse([__DIR__ . '/data/bug-8850.php'], []);
 	}
 
+	public function testBug9409(): void
+	{
+		$this->alwaysWrittenTags = [];
+		$this->alwaysReadTags = [];
+		$this->analyse([__DIR__ . '/data/bug-9409.php'], []);
+	}
+
 }

tests/PHPStan/Rules/DeadCode/data/bug-9409.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Bug9409;
+
+class HelloWorld
+{
+	/** @var array<string,string|null> $tempDir */
+	private static array $tempDir = [];
+
+	public function getTempDir(string $name): string|null
+	{
+		if (isset($this::$tempDir[$name])) {
+			return $this::$tempDir[$name];
+		}
+
+		$path = '';
+
+		$this::$tempDir[$name] = $path;
+
+		return $path;
+	}
+}

tests/PHPStan/Rules/DeadCode/data/unused-private-method.php

@@ -156,3 +156,18 @@ private function doLorem()
 	}
 
 }
+
+class StaticMethod
+{
+
+	private static function doFoo(): void
+	{
+
+	}
+
+	public function doTest(): void
+	{
+		$this::doFoo();
+	}
+
+}