[DI] Prevent a ReflectionException during cache:clear when the parent…

… class doesn't exist

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

@@ -378,7 +378,11 @@ private function collectLineage($class, array &$lineage)
         if (isset($lineage[$class])) {
             return;
         }
-        if (!$r = $this->container->getReflectionClass($class)) {
+        try {
+            if (!$r = $this->container->getReflectionClass($class)) {
+                return;
+            }
+        } catch (\ReflectionException $e) {
             return;
         }
         if ($this->container instanceof $class) {

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

@@ -25,6 +25,7 @@
 use Symfony\Component\DependencyInjection\EnvVarProcessorInterface;
 use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
 use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\ParentNotExists;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\StubbedTranslator;
 use Symfony\Component\DependencyInjection\TypedReference;
 use Symfony\Component\DependencyInjection\Definition;
@@ -964,3 +965,4 @@ public static function getProvidedTypes()
         return array('rot13' => 'string');
     }
 }
+

src/Symfony/Component/DependencyInjection/Tests/Fixtures/ParentNotExists.php

@@ -0,0 +1,19 @@
+<?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;
+
+/**
+ * @author Kévin Dunglas <dunglas@gmail.com>
+ */
+class ParentNotExists extends \NotExists
+{
+}

src/Symfony/Component/DependencyInjection/Tests/Fixtures/containers/container_inline_requires.php

@@ -7,11 +7,13 @@
 use Symfony\Component\DependencyInjection\Dumper\PhpDumper;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\includes\HotPath;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\ParentNotExists;
 
 $container = new ContainerBuilder();
 
 $container->register(HotPath\C1::class)->addTag('container.hot_path')->setPublic(true);
 $container->register(HotPath\C2::class)->addArgument(new Reference(HotPath\C3::class))->setPublic(true);
 $container->register(HotPath\C3::class);
+$container->register(ParentNotExists::class);
 
 return $container;

src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/container_inline_requires.php

@@ -32,13 +32,16 @@ public function __construct()
             'symfony\\component\\dependencyinjection\\tests\\fixtures\\includes\\hotpath\\c1' => 'Symfony\\Component\\DependencyInjection\\Tests\\Fixtures\\includes\\HotPath\\C1',
             'symfony\\component\\dependencyinjection\\tests\\fixtures\\includes\\hotpath\\c2' => 'Symfony\\Component\\DependencyInjection\\Tests\\Fixtures\\includes\\HotPath\\C2',
             'symfony\\component\\dependencyinjection\\tests\\fixtures\\includes\\hotpath\\c3' => 'Symfony\\Component\\DependencyInjection\\Tests\\Fixtures\\includes\\HotPath\\C3',
+            'symfony\\component\\dependencyinjection\\tests\\fixtures\\parentnotexists' => 'Symfony\\Component\\DependencyInjection\\Tests\\Fixtures\\ParentNotExists',
         );
         $this->methodMap = array(
+            'Symfony\\Component\\DependencyInjection\\Tests\\Fixtures\\ParentNotExists' => 'getParentNotExistsService',
             'Symfony\\Component\\DependencyInjection\\Tests\\Fixtures\\includes\\HotPath\\C1' => 'getC1Service',
             'Symfony\\Component\\DependencyInjection\\Tests\\Fixtures\\includes\\HotPath\\C2' => 'getC2Service',
             'Symfony\\Component\\DependencyInjection\\Tests\\Fixtures\\includes\\HotPath\\C3' => 'getC3Service',
         );
         $this->privates = array(
+            'Symfony\\Component\\DependencyInjection\\Tests\\Fixtures\\ParentNotExists' => true,
             'Symfony\\Component\\DependencyInjection\\Tests\\Fixtures\\includes\\HotPath\\C3' => true,
         );
 
@@ -98,6 +101,16 @@ protected function getC2Service()
         return $this->services['Symfony\Component\DependencyInjection\Tests\Fixtures\includes\HotPath\C2'] = new \Symfony\Component\DependencyInjection\Tests\Fixtures\includes\HotPath\C2(${($_ = isset($this->services['Symfony\Component\DependencyInjection\Tests\Fixtures\includes\HotPath\C3']) ? $this->services['Symfony\Component\DependencyInjection\Tests\Fixtures\includes\HotPath\C3'] : $this->services['Symfony\Component\DependencyInjection\Tests\Fixtures\includes\HotPath\C3'] = new \Symfony\Component\DependencyInjection\Tests\Fixtures\includes\HotPath\C3()) && false ?: '_'});
     }
 
+    /**
+     * Gets the private 'Symfony\Component\DependencyInjection\Tests\Fixtures\ParentNotExists' shared service.
+     *
+     * @return \Symfony\Component\DependencyInjection\Tests\Fixtures\ParentNotExists
+     */
+    protected function getParentNotExistsService()
+    {
+        return $this->services['Symfony\Component\DependencyInjection\Tests\Fixtures\ParentNotExists'] = new \Symfony\Component\DependencyInjection\Tests\Fixtures\ParentNotExists();
+    }
+
     /**
      * Gets the private 'Symfony\Component\DependencyInjection\Tests\Fixtures\includes\HotPath\C3' shared service.
      *