[DependencyInjection] Preload classes with union types correctly.

.github/patch-types.php

@@ -33,6 +33,7 @@ foreach ($loader->getClassMap() as $class => $file) {
         case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/includes/autowiring_classes.php'):
         case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/includes/uniontype_classes.php'):
         case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/ParentNotExists.php'):
+        case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Preload/'):
         case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Prototype/BadClasses/MissingParent.php'):
         case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/'):
         case false !== strpos($file, '/src/Symfony/Component/ErrorHandler/Tests/Fixtures/'):

src/Symfony/Component/DependencyInjection/Dumper/Preloader.php

@@ -94,7 +94,7 @@ class Preloader
 
     private static function preloadType(?\ReflectionType $t, array &$preloaded): void
     {
-        if (!$t || $t->isBuiltin()) {
+        if (!$t) {
             return;
         }
 

src/Symfony/Component/DependencyInjection/Tests/Dumper/PreloaderTest.php

@@ -0,0 +1,53 @@
+<?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\DependencyInjection\Tests\Dumper;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\Dumper\Preloader;
+
+class PreloaderTest extends TestCase
+{
+    /**
+     * @requires PHP 7.4
+     */
+    public function testPreload()
+    {
+        $r = new \ReflectionMethod(Preloader::class, 'doPreload');
+        $r->setAccessible(true);
+
+        $preloaded = [];
+
+        $r->invokeArgs(null, ['Symfony\Component\DependencyInjection\Tests\Fixtures\Preload\Dummy', &$preloaded]);
+
+        self::assertTrue(class_exists('Symfony\Component\DependencyInjection\Tests\Fixtures\Preload\Dummy', false));
+        self::assertTrue(class_exists('Symfony\Component\DependencyInjection\Tests\Fixtures\Preload\A', false));
+        self::assertTrue(class_exists('Symfony\Component\DependencyInjection\Tests\Fixtures\Preload\B', false));
+        self::assertTrue(class_exists('Symfony\Component\DependencyInjection\Tests\Fixtures\Preload\C', false));
+    }
+
+    /**
+     * @requires PHP 8
+     */
+    public function testPreloadUnion()
+    {
+        $r = new \ReflectionMethod(Preloader::class, 'doPreload');
+        $r->setAccessible(true);
+
+        $preloaded = [];
+
+        $r->invokeArgs(null, ['Symfony\Component\DependencyInjection\Tests\Fixtures\Preload\UnionDummy', &$preloaded]);
+
+        self::assertTrue(class_exists('Symfony\Component\DependencyInjection\Tests\Fixtures\Preload\UnionDummy', false));
+        self::assertTrue(class_exists('Symfony\Component\DependencyInjection\Tests\Fixtures\Preload\D', false));
+        self::assertTrue(class_exists('Symfony\Component\DependencyInjection\Tests\Fixtures\Preload\E', false));
+    }
+}

src/Symfony/Component/DependencyInjection/Tests/Fixtures/Preload/A.php

@@ -0,0 +1,16 @@
+<?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\DependencyInjection\Tests\Fixtures\Preload;
+
+final class A
+{
+}

src/Symfony/Component/DependencyInjection/Tests/Fixtures/Preload/B.php

@@ -0,0 +1,16 @@
+<?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\DependencyInjection\Tests\Fixtures\Preload;
+
+final class B
+{
+}

src/Symfony/Component/DependencyInjection/Tests/Fixtures/Preload/C.php

@@ -0,0 +1,16 @@
+<?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\DependencyInjection\Tests\Fixtures\Preload;
+
+final class C
+{
+}

src/Symfony/Component/DependencyInjection/Tests/Fixtures/Preload/D.php

@@ -0,0 +1,16 @@
+<?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\DependencyInjection\Tests\Fixtures\Preload;
+
+final class D
+{
+}

src/Symfony/Component/DependencyInjection/Tests/Fixtures/Preload/Dummy.php

@@ -0,0 +1,30 @@
+<?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\DependencyInjection\Tests\Fixtures\Preload;
+
+final class Dummy
+{
+    public A $a;
+
+    public function doSomething(B $b): ?C
+    {
+        return null;
+    }
+
+    public function noTypes($foo)
+    {
+    }
+
+    public function builtinTypes(int $foo): ?string
+    {
+    }
+}

src/Symfony/Component/DependencyInjection/Tests/Fixtures/Preload/E.php

@@ -0,0 +1,16 @@
+<?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\DependencyInjection\Tests\Fixtures\Preload;
+
+final class E
+{
+}

src/Symfony/Component/DependencyInjection/Tests/Fixtures/Preload/UnionDummy.php

@@ -0,0 +1,21 @@
+<?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\DependencyInjection\Tests\Fixtures\Preload;
+
+final class UnionDummy
+{
+    public D|E $de;
+
+    public function builtinTypes(int|float $foo): string|\Stringable|null
+    {
+    }
+}