diff --git a/src/Php/CompilerBase.php b/src/Php/CompilerBase.php
index 5c58c343..051a14d2 100644
--- a/src/Php/CompilerBase.php
+++ b/src/Php/CompilerBase.php
@@ -174,7 +174,7 @@ class CompilerBase extends \PhpAot\Core\Translator
     protected int $floatPrecision = 17;
     protected bool $debug = false;
     protected bool $formatCode = true;
-    protected bool $printBacktraceOnError = false;
+    protected bool $printBacktraceOnError = true;
     protected bool $noLiteralStrings = false;
     protected bool $noConsole = false;  // Windows: hide console window
     protected string $sanitize = '';    // Sanitizer type (address, undefined, etc.)
@@ -1800,9 +1800,9 @@ class CompilerBase extends \PhpAot\Core\Translator
             } elseif (!$this->isInheritedFrom($objectClass, $returnClass)) {
                 $this->fatalError($v, 'The return type is `' . $returnClass . '`, cannot return an instance of `' . $objectClass . '`');
             }
-            // 把子类当做父类返回时，父类必须是抽象类
-            if ($objectClass and $objectClass !== $returnClass and !$this->isAbstractClass($returnClass)) {
-                $this->fatalError($v, "When returning a subclass `$objectClass` instance as parent type, the parent class `$returnClass` must be abstract");
+            // 把子类当做父类返回时，父类必须是抽象类或者接口
+            if ($objectClass and $objectClass !== $returnClass and !$this->isAbstractClass($returnClass) and !$this->hasInterface($returnClass)) {
+                $this->fatalError($v, "When returning a subclass `$objectClass` instance as parent type, the parent class `$returnClass` must be abstract/interface");
             }
         }
 
diff --git a/src/gen_stub.php b/src/gen_stub.php
index 4c437546..4eb70b78 100755
--- a/src/gen_stub.php
+++ b/src/gen_stub.php
@@ -218,7 +218,8 @@ class SimpleType {
     public /* readonly */ string $name;
     public /* readonly */ bool $isBuiltin;
 
-    public static function fromNode(Node $node): SimpleType {
+    public static function fromNode(Node $node): SimpleType|ArrayType
+    {
         if ($node instanceof Node\Name) {
             if ($node->toLowerString() === 'static') {
                 // PHP internally considers "static" a builtin type.
@@ -244,7 +245,7 @@ class SimpleType {
         throw new Exception("Unexpected node type");
     }
 
-    public static function fromString(string $typeString): SimpleType
+    public static function fromString(string $typeString): SimpleType|ArrayType
     {
         switch (strtolower($typeString)) {
             case "void":
diff --git a/tests/aot/ref-call-arg.phpt b/tests/aot/ref-call-arg.phpt
index 8aa044b5..e1b7f65a 100644
--- a/tests/aot/ref-call-arg.phpt
+++ b/tests/aot/ref-call-arg.phpt
@@ -5,7 +5,8 @@ ref call arg
 function main()
 {
     $zip = new ZipArchive();
-    if ($zip->open(__DIR__ . '/../../examples/test.zip') === TRUE) {
+    $path = realpath(__DIR__ . '/../../../data/test.zip');
+    if ($zip->open($path) === TRUE) {
         for ($idx = 0; $s = $zip->statIndex($idx); $idx++) {
             $rs = $zip->getExternalAttributesIndex($idx, $opsys, $attr);
             var_dump($rs, $idx, $opsys, $attr);
@@ -35,8 +36,12 @@ bool(true)
 int(2)
 int(3)
 int(2176057344)
+bool(true)
+int(3)
+int(3)
+int(2176057344)
 OK
 value
 foo bar
 baz
-DONE
+DONE
\ No newline at end of file