test(compiler): cover cross-namespace parameter variance

src/Translator.php

@@ -3242,6 +3242,7 @@ CODE;
             return $arg->typeCheck;
         }
 
+        $declaredClass = $arg->declaredClass ?: $arg->class;
         return match ($arg->type) {
             Type::INT => [['kind' => 'isInt']],
             Type::FLOAT => [['kind' => 'isFloat']],
@@ -3249,8 +3250,8 @@ CODE;
             Type::STR => [['kind' => 'isString']],
             Type::ARRAY => [['kind' => 'isArray']],
             Type::RESOURCE => [['kind' => 'isResource']],
-            Type::OBJECT => $arg->declaredClass
+            Type::OBJECT => $declaredClass
-                ? [['kind' => 'instanceof', 'class' => $arg->declaredClass]]
+                ? [['kind' => 'instanceof', 'class' => $declaredClass]]
                 : [['kind' => 'isObject']],
             default => null,
         };

tests/compiler/namespace/interface-impl-param-type-cross-ns.phpt

@@ -1,8 +1,9 @@
 --TEST--
-Cross-namespace interface implementation with an interface-typed parameter must not be reported as incompatible
+Cross-namespace interface implementation parameter compatibility is declaration-order independent
 --FILE--
 <?php
 namespace A {
+    use B\I0;
     use B\I1;
     use B\I2;
 
@@ -12,17 +13,28 @@ namespace A {
         {
             return true;
         }
+
+        public function testParent(I0 $a): bool
+        {
+            return true;
+        }
     }
 }
 
 namespace B {
-    interface I1
+    interface I0
+    {
+    }
+
+    interface I1 extends I0
     {
     }
 
     interface I2
     {
         public function test(I1 $a): bool;
+
+        public function testParent(I1 $a): bool;
     }
 
     class Impl1 implements I1
@@ -39,10 +51,12 @@ namespace {
     {
         $obj = new Concrete();
         var_dump($obj->test(new \B\Impl1()));
+        var_dump($obj->testParent(new \B\Impl1()));
         echo "done\n";
     }
 }
 ?>
 --EXPECT--
 bool(true)
+bool(true)
 done