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diff --git a/vendor/nikic/php-parser/lib/PhpParser/Unserializer/XML.php b/vendor/nikic/php-parser/lib/PhpParser/Unserializer/XML.php
new file mode 100644
index 000000000..b33dd097e
--- /dev/null
+++ b/vendor/nikic/php-parser/lib/PhpParser/Unserializer/XML.php
@@ -0,0 +1,155 @@
+<?php
+
+namespace PhpParser\Unserializer;
+
+use DomainException;
+use PhpParser\Unserializer;
+use XMLReader;
+
+/**
+ * @deprecated
+ */
+class XML implements Unserializer
+{
+    protected $reader;
+
+    public function __construct() {
+        $this->reader = new XMLReader;
+    }
+
+    public function unserialize($string) {
+        $this->reader->XML($string);
+
+        $this->reader->read();
+        if ('AST' !== $this->reader->name) {
+            throw new DomainException('AST root element not found');
+        }
+
+        return $this->read($this->reader->depth);
+    }
+
+    protected function read($depthLimit, $throw = true, &$nodeFound = null) {
+        $nodeFound = true;
+        while ($this->reader->read() && $depthLimit < $this->reader->depth) {
+            if (XMLReader::ELEMENT !== $this->reader->nodeType) {
+                continue;
+            }
+
+            if ('node' === $this->reader->prefix) {
+                return $this->readNode();
+            } elseif ('scalar' === $this->reader->prefix) {
+                return $this->readScalar();
+            } elseif ('comment' === $this->reader->name) {
+                return $this->readComment();
+            } else {
+                throw new DomainException(sprintf('Unexpected node of type "%s"', $this->reader->name));
+            }
+        }
+
+        $nodeFound = false;
+        if ($throw) {
+            throw new DomainException('Expected node or scalar');
+        }
+    }
+
+    protected function readNode() {
+        $className = $this->getClassNameFromType($this->reader->localName);
+
+        // create the node without calling it's constructor
+        $node = unserialize(
+            sprintf(
+                "O:%d:\"%s\":1:{s:13:\"\0*\0attributes\";a:0:{}}",
+                strlen($className), $className
+            )
+        );
+
+        $depthLimit = $this->reader->depth;
+        while ($this->reader->read() && $depthLimit < $this->reader->depth) {
+            if (XMLReader::ELEMENT !== $this->reader->nodeType) {
+                continue;
+            }
+
+            $type = $this->reader->prefix;
+            if ('subNode' !== $type && 'attribute' !== $type) {
+                throw new DomainException(
+                    sprintf('Expected sub node or attribute, got node of type "%s"', $this->reader->name)
+                );
+            }
+
+            $name = $this->reader->localName;
+            $value = $this->read($this->reader->depth);
+
+            if ('subNode' === $type) {
+                $node->$name = $value;
+            } else {
+                $node->setAttribute($name, $value);
+            }
+        }
+
+        return $node;
+    }
+
+    protected function readScalar() {
+        switch ($name = $this->reader->localName) {
+            case 'array':
+                $depth = $this->reader->depth;
+                $array = array();
+                while (true) {
+                    $node = $this->read($depth, false, $nodeFound);
+                    if (!$nodeFound) {
+                        break;
+                    }
+                    $array[] = $node;
+                }
+                return $array;
+            case 'string':
+                return $this->reader->readString();
+            case 'int':
+                return $this->parseInt($this->reader->readString());
+            case 'float':
+                $text = $this->reader->readString();
+                if (false === $float = filter_var($text, FILTER_VALIDATE_FLOAT)) {
+                    throw new DomainException(sprintf('"%s" is not a valid float', $text));
+                }
+                return $float;
+            case 'true':
+            case 'false':
+            case 'null':
+                if (!$this->reader->isEmptyElement) {
+                    throw new DomainException(sprintf('"%s" scalar must be empty', $name));
+                }
+                return constant($name);
+            default:
+                throw new DomainException(sprintf('Unknown scalar type "%s"', $name));
+        }
+    }
+
+    private function parseInt($text) {
+        if (false === $int = filter_var($text, FILTER_VALIDATE_INT)) {
+            throw new DomainException(sprintf('"%s" is not a valid integer', $text));
+        }
+        return $int;
+    }
+
+    protected function readComment() {
+        $className = $this->reader->getAttribute('isDocComment') === 'true'
+            ? 'PhpParser\Comment\Doc'
+            : 'PhpParser\Comment'
+        ;
+        return new $className(
+            $this->reader->readString(),
+            $this->parseInt($this->reader->getAttribute('line'))
+        );
+    }
+
+    protected function getClassNameFromType($type) {
+        $className = 'PhpParser\\Node\\' . strtr($type, '_', '\\');
+        if (!class_exists($className)) {
+            $className .= '_';
+        }
+        if (!class_exists($className)) {
+            throw new DomainException(sprintf('Unknown node type "%s"', $type));
+        }
+        return $className;
+    }
+}