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diff --git a/vendor/psy/psysh/src/Psy/CodeCleaner/StaticConstructorPass.php b/vendor/psy/psysh/src/Psy/CodeCleaner/StaticConstructorPass.php
new file mode 100644
index 000000000..f0748a42b
--- /dev/null
+++ b/vendor/psy/psysh/src/Psy/CodeCleaner/StaticConstructorPass.php
@@ -0,0 +1,87 @@
+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2017 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Psy\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Stmt\Class_ as ClassStmt;
+use PhpParser\Node\Stmt\ClassMethod;
+use PhpParser\Node\Stmt\Namespace_ as NamespaceStmt;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * Validate that the old-style constructor function is not static.
+ *
+ * As of PHP 5.3.3, methods with the same name as the last element of a namespaced class name
+ * will no longer be treated as constructor. This change doesn't affect non-namespaced classes.
+ *
+ * Validation of the __construct method ensures the PHP Parser.
+ *
+ * @author Martin Hasoň <martin.hason@gmail.com>
+ */
+class StaticConstructorPass extends CodeCleanerPass
+{
+    private $isPHP533;
+    private $namespace;
+
+    public function __construct()
+    {
+        $this->isPHP533 = version_compare(PHP_VERSION, '5.3.3', '>=');
+    }
+
+    public function beforeTraverse(array $nodes)
+    {
+        $this->namespace = array();
+    }
+
+    /**
+     * Validate that the old-style constructor function is not static.
+     *
+     * @throws FatalErrorException if the old-style constructor function is static
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        if ($node instanceof NamespaceStmt) {
+            $this->namespace = isset($node->name) ? $node->name->parts : array();
+        } elseif ($node instanceof ClassStmt) {
+            // Bail early if this is PHP 5.3.3 and we have a namespaced class
+            if (!empty($this->namespace) && $this->isPHP533) {
+                return;
+            }
+
+            $constructor = null;
+            foreach ($node->stmts as $stmt) {
+                if ($stmt instanceof ClassMethod) {
+                    // Bail early if we find a new-style constructor
+                    if ('__construct' === strtolower($stmt->name)) {
+                        return;
+                    }
+
+                    // We found a possible old-style constructor
+                    // (unless there is also a __construct method)
+                    if (strtolower($node->name) === strtolower($stmt->name)) {
+                        $constructor = $stmt;
+                    }
+                }
+            }
+
+            if ($constructor && $constructor->isStatic()) {
+                throw new FatalErrorException(sprintf(
+                    'Constructor %s::%s() cannot be static',
+                    implode('\\', array_merge($this->namespace, (array) $node->name)),
+                    $constructor->name
+                ));
+            }
+        }
+    }
+}