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diff --git a/vendor/symfony/debug/FatalErrorHandler/ClassNotFoundFatalErrorHandler.php b/vendor/symfony/debug/FatalErrorHandler/ClassNotFoundFatalErrorHandler.php
new file mode 100644
index 000000000..612bfcaf7
--- /dev/null
+++ b/vendor/symfony/debug/FatalErrorHandler/ClassNotFoundFatalErrorHandler.php
@@ -0,0 +1,212 @@
+<?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\Debug\FatalErrorHandler;
+
+use Symfony\Component\Debug\Exception\ClassNotFoundException;
+use Symfony\Component\Debug\Exception\FatalErrorException;
+use Symfony\Component\Debug\DebugClassLoader;
+use Composer\Autoload\ClassLoader as ComposerClassLoader;
+use Symfony\Component\ClassLoader\ClassLoader as SymfonyClassLoader;
+use Symfony\Component\ClassLoader\UniversalClassLoader as SymfonyUniversalClassLoader;
+
+/**
+ * ErrorHandler for classes that do not exist.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function handleError(array $error, FatalErrorException $exception)
+    {
+        $messageLen = strlen($error['message']);
+        $notFoundSuffix = '\' not found';
+        $notFoundSuffixLen = strlen($notFoundSuffix);
+        if ($notFoundSuffixLen > $messageLen) {
+            return;
+        }
+
+        if (0 !== substr_compare($error['message'], $notFoundSuffix, -$notFoundSuffixLen)) {
+            return;
+        }
+
+        foreach (array('class', 'interface', 'trait') as $typeName) {
+            $prefix = ucfirst($typeName).' \'';
+            $prefixLen = strlen($prefix);
+            if (0 !== strpos($error['message'], $prefix)) {
+                continue;
+            }
+
+            $fullyQualifiedClassName = substr($error['message'], $prefixLen, -$notFoundSuffixLen);
+            if (false !== $namespaceSeparatorIndex = strrpos($fullyQualifiedClassName, '\\')) {
+                $className = substr($fullyQualifiedClassName, $namespaceSeparatorIndex + 1);
+                $namespacePrefix = substr($fullyQualifiedClassName, 0, $namespaceSeparatorIndex);
+                $message = sprintf('Attempted to load %s "%s" from namespace "%s".', $typeName, $className, $namespacePrefix);
+                $tail = ' for another namespace?';
+            } else {
+                $className = $fullyQualifiedClassName;
+                $message = sprintf('Attempted to load %s "%s" from the global namespace.', $typeName, $className);
+                $tail = '?';
+            }
+
+            if ($candidates = $this->getClassCandidates($className)) {
+                $tail = array_pop($candidates).'"?';
+                if ($candidates) {
+                    $tail = ' for e.g. "'.implode('", "', $candidates).'" or "'.$tail;
+                } else {
+                    $tail = ' for "'.$tail;
+                }
+            }
+            $message .= "\nDid you forget a \"use\" statement".$tail;
+
+            return new ClassNotFoundException($message, $exception);
+        }
+    }
+
+    /**
+     * Tries to guess the full namespace for a given class name.
+     *
+     * By default, it looks for PSR-0 and PSR-4 classes registered via a Symfony or a Composer
+     * autoloader (that should cover all common cases).
+     *
+     * @param string $class A class name (without its namespace)
+     *
+     * @return array An array of possible fully qualified class names
+     */
+    private function getClassCandidates($class)
+    {
+        if (!is_array($functions = spl_autoload_functions())) {
+            return array();
+        }
+
+        // find Symfony and Composer autoloaders
+        $classes = array();
+
+        foreach ($functions as $function) {
+            if (!is_array($function)) {
+                continue;
+            }
+            // get class loaders wrapped by DebugClassLoader
+            if ($function[0] instanceof DebugClassLoader) {
+                $function = $function[0]->getClassLoader();
+
+                // @deprecated since version 2.5. Returning an object from DebugClassLoader::getClassLoader() is deprecated.
+                if (is_object($function)) {
+                    $function = array($function);
+                }
+
+                if (!is_array($function)) {
+                    continue;
+                }
+            }
+
+            if ($function[0] instanceof ComposerClassLoader || $function[0] instanceof SymfonyClassLoader || $function[0] instanceof SymfonyUniversalClassLoader) {
+                foreach ($function[0]->getPrefixes() as $prefix => $paths) {
+                    foreach ($paths as $path) {
+                        $classes = array_merge($classes, $this->findClassInPath($path, $class, $prefix));
+                    }
+                }
+            }
+            if ($function[0] instanceof ComposerClassLoader) {
+                foreach ($function[0]->getPrefixesPsr4() as $prefix => $paths) {
+                    foreach ($paths as $path) {
+                        $classes = array_merge($classes, $this->findClassInPath($path, $class, $prefix));
+                    }
+                }
+            }
+        }
+
+        return array_unique($classes);
+    }
+
+    /**
+     * @param string $path
+     * @param string $class
+     * @param string $prefix
+     *
+     * @return array
+     */
+    private function findClassInPath($path, $class, $prefix)
+    {
+        if (!$path = realpath($path.'/'.strtr($prefix, '\\_', '//')) ?: realpath($path.'/'.dirname(strtr($prefix, '\\_', '//'))) ?: realpath($path)) {
+            return array();
+        }
+
+        $classes = array();
+        $filename = $class.'.php';
+        foreach (new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($path, \RecursiveDirectoryIterator::SKIP_DOTS), \RecursiveIteratorIterator::LEAVES_ONLY) as $file) {
+            if ($filename == $file->getFileName() && $class = $this->convertFileToClass($path, $file->getPathName(), $prefix)) {
+                $classes[] = $class;
+            }
+        }
+
+        return $classes;
+    }
+
+    /**
+     * @param string $path
+     * @param string $file
+     * @param string $prefix
+     *
+     * @return string|null
+     */
+    private function convertFileToClass($path, $file, $prefix)
+    {
+        $candidates = array(
+            // namespaced class
+            $namespacedClass = str_replace(array($path.DIRECTORY_SEPARATOR, '.php', '/'), array('', '', '\\'), $file),
+            // namespaced class (with target dir)
+            $prefix.$namespacedClass,
+            // namespaced class (with target dir and separator)
+            $prefix.'\\'.$namespacedClass,
+            // PEAR class
+            str_replace('\\', '_', $namespacedClass),
+            // PEAR class (with target dir)
+            str_replace('\\', '_', $prefix.$namespacedClass),
+            // PEAR class (with target dir and separator)
+            str_replace('\\', '_', $prefix.'\\'.$namespacedClass),
+        );
+
+        if ($prefix) {
+            $candidates = array_filter($candidates, function ($candidate) use ($prefix) { return 0 === strpos($candidate, $prefix); });
+        }
+
+        // We cannot use the autoloader here as most of them use require; but if the class
+        // is not found, the new autoloader call will require the file again leading to a
+        // "cannot redeclare class" error.
+        foreach ($candidates as $candidate) {
+            if ($this->classExists($candidate)) {
+                return $candidate;
+            }
+        }
+
+        require_once $file;
+
+        foreach ($candidates as $candidate) {
+            if ($this->classExists($candidate)) {
+                return $candidate;
+            }
+        }
+    }
+
+    /**
+     * @param string $class
+     *
+     * @return bool
+     */
+    private function classExists($class)
+    {
+        return class_exists($class, false) || interface_exists($class, false) || (function_exists('trait_exists') && trait_exists($class, false));
+    }
+}