[VarExporter] Uniform unitialized property error message under ghost and non-ghost objects

Author: priyadi

LazyGhostTrait.php

@@ -223,6 +223,10 @@ public function &__get($name): mixed
 
                 return $accessor['get']($this, $name, null !== $readonlyScope);
             } catch (\Error) {
+                if (preg_match('/^Cannot access uninitialized non-nullable property ([^ ]++) by reference$/', $e->getMessage(), $matches)) {
+                    throw new \Error('Typed property '.$matches[1].' must not be accessed before initialization', $e->getCode(), $e->getPrevious());
+                }
+
                 throw $e;
             }
         }

Tests/Fixtures/LazyGhost/ClassWithUninitializedObjectProperty.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\VarExporter\Tests\Fixtures\LazyGhost;
+
+class ClassWithUninitializedObjectProperty
+{
+    public \DateTimeInterface $property;
+}

Tests/LazyGhostTraitTest.php

@@ -17,6 +17,7 @@
 use Symfony\Component\VarExporter\Tests\Fixtures\LazyGhost\ChildMagicClass;
 use Symfony\Component\VarExporter\Tests\Fixtures\LazyGhost\ChildStdClass;
 use Symfony\Component\VarExporter\Tests\Fixtures\LazyGhost\ChildTestClass;
+use Symfony\Component\VarExporter\Tests\Fixtures\LazyGhost\ClassWithUninitializedObjectProperty;
 use Symfony\Component\VarExporter\Tests\Fixtures\LazyGhost\LazyClass;
 use Symfony\Component\VarExporter\Tests\Fixtures\LazyGhost\MagicClass;
 use Symfony\Component\VarExporter\Tests\Fixtures\LazyGhost\ReadOnlyClass;
@@ -438,6 +439,28 @@ public function testReadOnlyClass()
         $this->assertSame(123, $proxy->foo);
     }
 
+    public function testAccessingUninializedPropertyWithoutLazyGhost()
+    {
+        $object = new ClassWithUninitializedObjectProperty();
+
+        $this->expectException(\Error::class);
+        $this->expectExceptionCode(0);
+        $this->expectExceptionMessage('Typed property Symfony\Component\VarExporter\Tests\Fixtures\LazyGhost\ClassWithUninitializedObjectProperty::$property must not be accessed before initialization');
+
+        $object->property;
+    }
+
+    public function testAccessingUninializedPropertyWithLazyGhost()
+    {
+        $object = $this->createLazyGhost(ClassWithUninitializedObjectProperty::class, function ($instance) {});
+
+        $this->expectException(\Error::class);
+        $this->expectExceptionCode(0);
+        $this->expectExceptionMessage('Typed property Symfony\Component\VarExporter\Tests\Fixtures\LazyGhost\ClassWithUninitializedObjectProperty::$property must not be accessed before initialization');
+
+        $object->property;
+    }
+
     /**
      * @template T
      *