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diff --git a/vendor/symfony/config/Resource/ClassExistenceResource.php b/vendor/symfony/config/Resource/ClassExistenceResource.php
index 8a9df906a..e3fd095b6 100644
--- a/vendor/symfony/config/Resource/ClassExistenceResource.php
+++ b/vendor/symfony/config/Resource/ClassExistenceResource.php
@@ -24,13 +24,20 @@ class ClassExistenceResource implements SelfCheckingResourceInterface, \Serializ
     private $resource;
     private $exists;
 
+    private static $autoloadLevel = 0;
+    private static $autoloadedClass;
+    private static $existsCache = array();
+
     /**
-     * @param string $resource The fully-qualified class name
+     * @param string    $resource The fully-qualified class name
+     * @param bool|null $exists   Boolean when the existency check has already been done
      */
-    public function __construct($resource)
+    public function __construct($resource, $exists = null)
     {
         $this->resource = $resource;
-        $this->exists = class_exists($resource);
+        if (null !== $exists) {
+            $this->exists = (bool) $exists;
+        }
     }
 
     /**
@@ -51,10 +58,42 @@ class ClassExistenceResource implements SelfCheckingResourceInterface, \Serializ
 
     /**
      * {@inheritdoc}
+     *
+     * @throws \ReflectionException when a parent class/interface/trait is not found
      */
     public function isFresh($timestamp)
     {
-        return class_exists($this->resource) === $this->exists;
+        $loaded = class_exists($this->resource, false) || interface_exists($this->resource, false) || trait_exists($this->resource, false);
+
+        if (null !== $exists = &self::$existsCache[(int) (0 >= $timestamp)][$this->resource]) {
+            $exists = $exists || $loaded;
+        } elseif (!$exists = $loaded) {
+            if (!self::$autoloadLevel++) {
+                spl_autoload_register(__CLASS__.'::throwOnRequiredClass');
+            }
+            $autoloadedClass = self::$autoloadedClass;
+            self::$autoloadedClass = $this->resource;
+
+            try {
+                $exists = class_exists($this->resource) || interface_exists($this->resource, false) || trait_exists($this->resource, false);
+            } catch (\ReflectionException $e) {
+                if (0 >= $timestamp) {
+                    unset(self::$existsCache[1][$this->resource]);
+                    throw $e;
+                }
+            } finally {
+                self::$autoloadedClass = $autoloadedClass;
+                if (!--self::$autoloadLevel) {
+                    spl_autoload_unregister(__CLASS__.'::throwOnRequiredClass');
+                }
+            }
+        }
+
+        if (null === $this->exists) {
+            $this->exists = $exists;
+        }
+
+        return $this->exists xor !$exists;
     }
 
     /**
@@ -62,6 +101,10 @@ class ClassExistenceResource implements SelfCheckingResourceInterface, \Serializ
      */
     public function serialize()
     {
+        if (null === $this->exists) {
+            $this->isFresh(0);
+        }
+
         return serialize(array($this->resource, $this->exists));
     }
 
@@ -72,4 +115,55 @@ class ClassExistenceResource implements SelfCheckingResourceInterface, \Serializ
     {
         list($this->resource, $this->exists) = unserialize($serialized);
     }
+
+    /**
+     * @throws \ReflectionException When $class is not found and is required
+     */
+    private static function throwOnRequiredClass($class)
+    {
+        if (self::$autoloadedClass === $class) {
+            return;
+        }
+        $e = new \ReflectionException("Class $class not found");
+        $trace = $e->getTrace();
+        $autoloadFrame = array(
+            'function' => 'spl_autoload_call',
+            'args' => array($class),
+        );
+        $i = 1 + array_search($autoloadFrame, $trace, true);
+
+        if (isset($trace[$i]['function']) && !isset($trace[$i]['class'])) {
+            switch ($trace[$i]['function']) {
+                case 'get_class_methods':
+                case 'get_class_vars':
+                case 'get_parent_class':
+                case 'is_a':
+                case 'is_subclass_of':
+                case 'class_exists':
+                case 'class_implements':
+                case 'class_parents':
+                case 'trait_exists':
+                case 'defined':
+                case 'interface_exists':
+                case 'method_exists':
+                case 'property_exists':
+                case 'is_callable':
+                    return;
+            }
+
+            $props = array(
+                'file' => $trace[$i]['file'],
+                'line' => $trace[$i]['line'],
+                'trace' => array_slice($trace, 1 + $i),
+            );
+
+            foreach ($props as $p => $v) {
+                $r = new \ReflectionProperty('Exception', $p);
+                $r->setAccessible(true);
+                $r->setValue($e, $v);
+            }
+        }
+
+        throw $e;
+    }
 }