Emit readonly classes natively with PHP 8.2

See https://wiki.php.net/rfc/readonly_classes

Author: thekid

ChangeLog.md

@@ -6,7 +6,7 @@ XP Compiler ChangeLog
 * Added PHP 8.4 emitter which natively emits property hooks and asymmetric
   visibility syntax
   (@thekid)
-* Changed emitter to use native readonly classes in PHP 8.3, fixing an
+* Changed emitter to use native readonly classes in PHP 8.2, fixing an
   inconsistency with accessing undefined properties
   (@thekid)
 

src/main/php/lang/ast/emit/PHP82.class.php

@@ -24,7 +24,6 @@ class PHP82 extends PHP {
     RewriteDynamicClassConstants,
     RewriteStaticVariableInitializations,
     RewriteProperties,
-    ReadonlyClasses,
     OmitConstantTypes
   ;
 

src/test/php/lang/ast/unittest/emit/PHP82Test.class.php

@@ -22,4 +22,12 @@ public function callable_static_method_syntax() {
   public function callable_instance_method_syntax() {
     Assert::equals('$this->method(...);', $this->emit('$this->method(...);'));
   }
+
+  #[Test]
+  public function readonly_classes() {
+    Assert::matches(
+      '/readonly class [A-Z0-9]+{/',
+      $this->emit('readonly class %T { }')
+    );
+  }
 }