Fix private(set) not being implicitely marked as final

See https://wiki.php.net/rfc/asymmetric-visibility-v2#inheritance

ChangeLog.md

@@ -3,6 +3,9 @@ XP Compiler ChangeLog
 
 ## ?.?.? / ????-??-??
 
+* Fixed `private(set)` not being implicitely marked as *final*, see
+  https://wiki.php.net/rfc/asymmetric-visibility-v2#inheritance
+  (@thekid)
 * Fixed enclosing scopes when using references - @thekid
 
 ## 9.3.0 / 2024-08-31

src/main/php/lang/ast/emit/AsymmetricVisibility.class.php

@@ -50,6 +50,7 @@ protected function emitProperty($result, $property) {
     } else if ($modifiers & 0x0001000) {
       $checks= [$this->private($property->name, 'modify private(set)')];
       $modifiers & MODIFIER_PRIVATE && $modifiers&= ~0x0001000;
+      $modifiers|= MODIFIER_FINAL;
     }
 
     // Emit XP meta information for the reflection API

src/test/php/lang/ast/unittest/emit/AsymmetricVisibilityTest.class.php

@@ -100,19 +100,31 @@ public function rename() {
     $t->newInstance()->rename();
   }
 
-  #[Test, Values(['private', 'protected'])]
-  public function reflection($modifier) {
+  #[Test]
+  public function protected_set_reflection() {
     $t= $this->declare('class %T {
-      public '.$modifier.'(set) string $fixture= "Test";
+      public protected(set) string $fixture= "Test";
     }');
 
     Assert::equals(
-      'public '.$modifier.'(set) string $fixture',
+      'public protected(set) string $fixture',
       $t->property('fixture')->toString()
     );
   }
 
-  #[Test, Values(['private', 'protected', 'public'])]
+  #[Test]
+  public function private_set_implicitely_final_in_reflection() {
+    $t= $this->declare('class %T {
+      public private(set) string $fixture= "Test";
+    }');
+
+    Assert::equals(
+      'public final private(set) string $fixture',
+      $t->property('fixture')->toString()
+    );
+  }
+
+  #[Test, Values(['protected', 'public'])]
   public function same_modifier_for_get_and_set($modifier) {
     $t= $this->declare('class %T {
       '.$modifier.' '.$modifier.'(set) string $fixture= "Test";
@@ -124,6 +136,18 @@ public function same_modifier_for_get_and_set($modifier) {
     );
   }
 
+  #[Test]
+  public function private_modifier_for_get_and_set() {
+    $t= $this->declare('class %T {
+      private private(set) string $fixture= "Test";
+    }');
+
+    Assert::equals(
+      'private final string $fixture',
+      $t->property('fixture')->toString()
+    );
+  }
+
   #[Test]
   public function interaction_with_hooks() {
     $t= $this->declare('class %T {