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diff --git a/vendor/symfony/config/Loader/FileLoader.php b/vendor/symfony/config/Loader/FileLoader.php
new file mode 100644
index 000000000..2b19b5258
--- /dev/null
+++ b/vendor/symfony/config/Loader/FileLoader.php
@@ -0,0 +1,137 @@
+<?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\Config\Loader;
+
+use Symfony\Component\Config\FileLocatorInterface;
+use Symfony\Component\Config\Exception\FileLoaderLoadException;
+use Symfony\Component\Config\Exception\FileLoaderImportCircularReferenceException;
+
+/**
+ * FileLoader is the abstract class used by all built-in loaders that are file based.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+abstract class FileLoader extends Loader
+{
+    /**
+     * @var array
+     */
+    protected static $loading = array();
+
+    /**
+     * @var FileLocatorInterface
+     */
+    protected $locator;
+
+    private $currentDir;
+
+    /**
+     * Constructor.
+     *
+     * @param FileLocatorInterface $locator A FileLocatorInterface instance
+     */
+    public function __construct(FileLocatorInterface $locator)
+    {
+        $this->locator = $locator;
+    }
+
+    /**
+     * Sets the current directory.
+     *
+     * @param string $dir
+     */
+    public function setCurrentDir($dir)
+    {
+        $this->currentDir = $dir;
+    }
+
+    /**
+     * Returns the file locator used by this loader.
+     *
+     * @return FileLocatorInterface
+     */
+    public function getLocator()
+    {
+        return $this->locator;
+    }
+
+    /**
+     * Imports a resource.
+     *
+     * @param mixed       $resource       A Resource
+     * @param string|null $type           The resource type or null if unknown
+     * @param bool        $ignoreErrors   Whether to ignore import errors or not
+     * @param string|null $sourceResource The original resource importing the new resource
+     *
+     * @return mixed
+     *
+     * @throws FileLoaderLoadException
+     * @throws FileLoaderImportCircularReferenceException
+     */
+    public function import($resource, $type = null, $ignoreErrors = false, $sourceResource = null)
+    {
+        try {
+            $loader = $this->resolve($resource, $type);
+
+            if ($loader instanceof self && null !== $this->currentDir) {
+                // we fallback to the current locator to keep BC
+                // as some some loaders do not call the parent __construct()
+                // @deprecated should be removed in 3.0
+                $locator = $loader->getLocator();
+                if (null === $locator) {
+                    @trigger_error('Not calling the parent constructor in '.get_class($loader).' which extends '.__CLASS__.' is deprecated since version 2.7 and will not be supported anymore in 3.0.', E_USER_DEPRECATED);
+                    $locator = $this->locator;
+                }
+
+                $resource = $locator->locate($resource, $this->currentDir, false);
+            }
+
+            $resources = is_array($resource) ? $resource : array($resource);
+            for ($i = 0; $i < $resourcesCount = count($resources); ++$i) {
+                if (isset(self::$loading[$resources[$i]])) {
+                    if ($i == $resourcesCount - 1) {
+                        throw new FileLoaderImportCircularReferenceException(array_keys(self::$loading));
+                    }
+                } else {
+                    $resource = $resources[$i];
+                    break;
+                }
+            }
+            self::$loading[$resource] = true;
+
+            try {
+                $ret = $loader->load($resource, $type);
+            } catch (\Exception $e) {
+                unset(self::$loading[$resource]);
+                throw $e;
+            } catch (\Throwable $e) {
+                unset(self::$loading[$resource]);
+                throw $e;
+            }
+
+            unset(self::$loading[$resource]);
+
+            return $ret;
+        } catch (FileLoaderImportCircularReferenceException $e) {
+            throw $e;
+        } catch (\Exception $e) {
+            if (!$ignoreErrors) {
+                // prevent embedded imports from nesting multiple exceptions
+                if ($e instanceof FileLoaderLoadException) {
+                    throw $e;
+                }
+
+                throw new FileLoaderLoadException($resource, $sourceResource, null, $e);
+            }
+        }
+    }
+}