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diff --git a/vendor/symfony/var-dumper/Caster/ExceptionCaster.php b/vendor/symfony/var-dumper/Caster/ExceptionCaster.php
new file mode 100644
index 000000000..c0c60a421
--- /dev/null
+++ b/vendor/symfony/var-dumper/Caster/ExceptionCaster.php
@@ -0,0 +1,286 @@
+<?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\VarDumper\Caster;
+
+use Symfony\Component\VarDumper\Exception\ThrowingCasterException;
+use Symfony\Component\VarDumper\Cloner\Stub;
+
+/**
+ * Casts common Exception classes to array representation.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+class ExceptionCaster
+{
+    public static $srcContext = 1;
+    public static $traceArgs = true;
+    public static $errorTypes = array(
+        E_DEPRECATED => 'E_DEPRECATED',
+        E_USER_DEPRECATED => 'E_USER_DEPRECATED',
+        E_RECOVERABLE_ERROR => 'E_RECOVERABLE_ERROR',
+        E_ERROR => 'E_ERROR',
+        E_WARNING => 'E_WARNING',
+        E_PARSE => 'E_PARSE',
+        E_NOTICE => 'E_NOTICE',
+        E_CORE_ERROR => 'E_CORE_ERROR',
+        E_CORE_WARNING => 'E_CORE_WARNING',
+        E_COMPILE_ERROR => 'E_COMPILE_ERROR',
+        E_COMPILE_WARNING => 'E_COMPILE_WARNING',
+        E_USER_ERROR => 'E_USER_ERROR',
+        E_USER_WARNING => 'E_USER_WARNING',
+        E_USER_NOTICE => 'E_USER_NOTICE',
+        E_STRICT => 'E_STRICT',
+    );
+
+    public static function castError(\Error $e, array $a, Stub $stub, $isNested, $filter = 0)
+    {
+        return self::filterExceptionArray($stub->class, $a, "\0Error\0", $filter);
+    }
+
+    public static function castException(\Exception $e, array $a, Stub $stub, $isNested, $filter = 0)
+    {
+        return self::filterExceptionArray($stub->class, $a, "\0Exception\0", $filter);
+    }
+
+    public static function castErrorException(\ErrorException $e, array $a, Stub $stub, $isNested)
+    {
+        if (isset($a[$s = Caster::PREFIX_PROTECTED.'severity'], self::$errorTypes[$a[$s]])) {
+            $a[$s] = new ConstStub(self::$errorTypes[$a[$s]], $a[$s]);
+        }
+
+        return $a;
+    }
+
+    public static function castThrowingCasterException(ThrowingCasterException $e, array $a, Stub $stub, $isNested)
+    {
+        $prefix = Caster::PREFIX_PROTECTED;
+        $xPrefix = "\0Exception\0";
+
+        if (isset($a[$xPrefix.'previous'], $a[$xPrefix.'trace']) && $a[$xPrefix.'previous'] instanceof \Exception) {
+            $b = (array) $a[$xPrefix.'previous'];
+            array_unshift($b[$xPrefix.'trace'], array(
+                'function' => 'new '.get_class($a[$xPrefix.'previous']),
+                'file' => $b[$prefix.'file'],
+                'line' => $b[$prefix.'line'],
+            ));
+            $a[$xPrefix.'trace'] = new TraceStub($b[$xPrefix.'trace'], false, 0, -1 - count($a[$xPrefix.'trace']->value));
+        }
+
+        unset($a[$xPrefix.'previous'], $a[$prefix.'code'], $a[$prefix.'file'], $a[$prefix.'line']);
+
+        return $a;
+    }
+
+    public static function castTraceStub(TraceStub $trace, array $a, Stub $stub, $isNested)
+    {
+        if (!$isNested) {
+            return $a;
+        }
+        $stub->class = '';
+        $stub->handle = 0;
+        $frames = $trace->value;
+
+        $a = array();
+        $j = count($frames);
+        if (0 > $i = $trace->sliceOffset) {
+            $i = max(0, $j + $i);
+        }
+        if (!isset($trace->value[$i])) {
+            return array();
+        }
+        $lastCall = isset($frames[$i]['function']) ? ' ==> '.(isset($frames[$i]['class']) ? $frames[0]['class'].$frames[$i]['type'] : '').$frames[$i]['function'].'()' : '';
+
+        for ($j += $trace->numberingOffset - $i++; isset($frames[$i]); ++$i, --$j) {
+            $call = isset($frames[$i]['function']) ? (isset($frames[$i]['class']) ? $frames[$i]['class'].$frames[$i]['type'] : '').$frames[$i]['function'].'()' : '???';
+
+            $a[Caster::PREFIX_VIRTUAL.$j.'. '.$call.$lastCall] = new FrameStub(
+                array(
+                    'object' => isset($frames[$i]['object']) ? $frames[$i]['object'] : null,
+                    'class' => isset($frames[$i]['class']) ? $frames[$i]['class'] : null,
+                    'type' => isset($frames[$i]['type']) ? $frames[$i]['type'] : null,
+                    'function' => isset($frames[$i]['function']) ? $frames[$i]['function'] : null,
+                ) + $frames[$i - 1],
+                $trace->keepArgs,
+                true
+            );
+
+            $lastCall = ' ==> '.$call;
+        }
+        $a[Caster::PREFIX_VIRTUAL.$j.'. {main}'.$lastCall] = new FrameStub(
+            array(
+                'object' => null,
+                'class' => null,
+                'type' => null,
+                'function' => '{main}',
+            ) + $frames[$i - 1],
+            $trace->keepArgs,
+            true
+        );
+        if (null !== $trace->sliceLength) {
+            $a = array_slice($a, 0, $trace->sliceLength, true);
+        }
+
+        return $a;
+    }
+
+    public static function castFrameStub(FrameStub $frame, array $a, Stub $stub, $isNested)
+    {
+        if (!$isNested) {
+            return $a;
+        }
+        $f = $frame->value;
+        $prefix = Caster::PREFIX_VIRTUAL;
+
+        if (isset($f['file'], $f['line'])) {
+            if (preg_match('/\((\d+)\)(?:\([\da-f]{32}\))? : (?:eval\(\)\'d code|runtime-created function)$/', $f['file'], $match)) {
+                $f['file'] = substr($f['file'], 0, -strlen($match[0]));
+                $f['line'] = (int) $match[1];
+            }
+            if (file_exists($f['file']) && 0 <= self::$srcContext) {
+                $src[$f['file'].':'.$f['line']] = self::extractSource(explode("\n", file_get_contents($f['file'])), $f['line'], self::$srcContext);
+
+                if (!empty($f['class']) && is_subclass_of($f['class'], 'Twig_Template') && method_exists($f['class'], 'getDebugInfo')) {
+                    $template = isset($f['object']) ? $f['object'] : unserialize(sprintf('O:%d:"%s":0:{}', strlen($f['class']), $f['class']));
+
+                    $templateName = $template->getTemplateName();
+                    $templateSrc = method_exists($template, 'getSourceContext') ? $template->getSourceContext()->getCode() : (method_exists($template, 'getSource') ? $template->getSource() : '');
+                    $templateInfo = $template->getDebugInfo();
+                    if (isset($templateInfo[$f['line']])) {
+                        if (method_exists($template, 'getSourceContext')) {
+                            $templateName = $template->getSourceContext()->getPath() ?: $templateName;
+                        }
+                        if ($templateSrc) {
+                            $templateSrc = explode("\n", $templateSrc);
+                            $src[$templateName.':'.$templateInfo[$f['line']]] = self::extractSource($templateSrc, $templateInfo[$f['line']], self::$srcContext);
+                        } else {
+                            $src[$templateName] = $templateInfo[$f['line']];
+                        }
+                    }
+                }
+            } else {
+                $src[$f['file']] = $f['line'];
+            }
+            $a[$prefix.'src'] = new EnumStub($src);
+        }
+
+        unset($a[$prefix.'args'], $a[$prefix.'line'], $a[$prefix.'file']);
+        if ($frame->inTraceStub) {
+            unset($a[$prefix.'class'], $a[$prefix.'type'], $a[$prefix.'function']);
+        }
+        foreach ($a as $k => $v) {
+            if (!$v) {
+                unset($a[$k]);
+            }
+        }
+        if ($frame->keepArgs && isset($f['args'])) {
+            $a[$prefix.'args'] = $f['args'];
+        }
+
+        return $a;
+    }
+
+    /**
+     * @deprecated since 2.8, to be removed in 3.0. Use the castTraceStub method instead.
+     */
+    public static function filterTrace(&$trace, $dumpArgs, $offset = 0)
+    {
+        @trigger_error('The '.__METHOD__.' method is deprecated since version 2.8 and will be removed in 3.0. Use the castTraceStub method instead.', E_USER_DEPRECATED);
+
+        if (0 > $offset || empty($trace[$offset])) {
+            return $trace = null;
+        }
+
+        $t = $trace[$offset];
+
+        if (empty($t['class']) && isset($t['function'])) {
+            if ('user_error' === $t['function'] || 'trigger_error' === $t['function']) {
+                ++$offset;
+            }
+        }
+
+        if ($offset) {
+            array_splice($trace, 0, $offset);
+        }
+
+        foreach ($trace as &$t) {
+            $t = array(
+                'call' => (isset($t['class']) ? $t['class'].$t['type'] : '').$t['function'].'()',
+                'file' => isset($t['line']) ? "{$t['file']}:{$t['line']}" : '',
+                'args' => &$t['args'],
+            );
+
+            if (!isset($t['args']) || !$dumpArgs) {
+                unset($t['args']);
+            }
+        }
+    }
+
+    private static function filterExceptionArray($xClass, array $a, $xPrefix, $filter)
+    {
+        if (isset($a[$xPrefix.'trace'])) {
+            $trace = $a[$xPrefix.'trace'];
+            unset($a[$xPrefix.'trace']); // Ensures the trace is always last
+        } else {
+            $trace = array();
+        }
+
+        if (!($filter & Caster::EXCLUDE_VERBOSE)) {
+            if (isset($a[Caster::PREFIX_PROTECTED.'file'], $a[Caster::PREFIX_PROTECTED.'line'])) {
+                array_unshift($trace, array(
+                    'function' => $xClass ? 'new '.$xClass : null,
+                    'file' => $a[Caster::PREFIX_PROTECTED.'file'],
+                    'line' => $a[Caster::PREFIX_PROTECTED.'line'],
+                ));
+            }
+            $a[$xPrefix.'trace'] = new TraceStub($trace, self::$traceArgs);
+        }
+        if (empty($a[$xPrefix.'previous'])) {
+            unset($a[$xPrefix.'previous']);
+        }
+        unset($a[$xPrefix.'string'], $a[Caster::PREFIX_DYNAMIC.'xdebug_message'], $a[Caster::PREFIX_DYNAMIC.'__destructorException']);
+
+        return $a;
+    }
+
+    private static function extractSource(array $srcArray, $line, $srcContext)
+    {
+        $src = array();
+
+        for ($i = $line - 1 - $srcContext; $i <= $line - 1 + $srcContext; ++$i) {
+            $src[] = (isset($srcArray[$i]) ? $srcArray[$i] : '')."\n";
+        }
+
+        $ltrim = 0;
+        do {
+            $pad = null;
+            for ($i = $srcContext << 1; $i >= 0; --$i) {
+                if (isset($src[$i][$ltrim]) && "\r" !== ($c = $src[$i][$ltrim]) && "\n" !== $c) {
+                    if (null === $pad) {
+                        $pad = $c;
+                    }
+                    if ((' ' !== $c && "\t" !== $c) || $pad !== $c) {
+                        break;
+                    }
+                }
+            }
+            ++$ltrim;
+        } while (0 > $i && null !== $pad);
+
+        if (--$ltrim) {
+            foreach ($src as $i => $line) {
+                $src[$i] = isset($line[$ltrim]) && "\r" !== $line[$ltrim] ? substr($line, $ltrim) : ltrim($line, " \t");
+            }
+        }
+
+        return implode('', $src);
+    }
+}