test static anonyous functions

Author: staabm

src/Analyser/MutatingScope.php

@@ -3714,6 +3714,8 @@ private function enterAnonymousFunctionWithoutReflection(
 				&& $expr->var instanceof Variable
 				&& is_string($expr->var->name)
 				&& $expr->var->name === 'this'
+				&& !$closure->static
+				&& $this->hasVariableType('this')->yes()
 				&& $this->phpVersion->supportsReadOnlyProperties()
 			) {
 				$propertyReflection = $this->propertyReflectionFinder->findPropertyReflectionFromNode($expr, $this);

tests/PHPStan/Analyser/nsrt/bug-13321.php

@@ -37,6 +37,15 @@ public function bar(): void
 		};
 
 		$test();
+
+		$test = static function () {
+			assertType('mixed', $this->foo);
+			assertType('mixed', $this->writableFoo);
+
+			echo $this->foo->value;
+		};
+
+		$test();
 	}
 
 }