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diff --git a/vendor/psy/psysh/src/CodeCleaner/CalledClassPass.php b/vendor/psy/psysh/src/CodeCleaner/CalledClassPass.php
new file mode 100644
index 000000000..280be3b7c
--- /dev/null
+++ b/vendor/psy/psysh/src/CodeCleaner/CalledClassPass.php
@@ -0,0 +1,83 @@
+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2018 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\Expr\ConstFetch;
+use PhpParser\Node\Expr\FuncCall;
+use PhpParser\Node\Name;
+use PhpParser\Node\Stmt\Class_;
+use PhpParser\Node\Stmt\Trait_;
+use Psy\Exception\ErrorException;
+
+/**
+ * The called class pass throws warnings for get_class() and get_called_class()
+ * outside a class context.
+ */
+class CalledClassPass extends CodeCleanerPass
+{
+    private $inClass;
+
+    /**
+     * @param array $nodes
+     */
+    public function beforeTraverse(array $nodes)
+    {
+        $this->inClass = false;
+    }
+
+    /**
+     * @throws ErrorException if get_class or get_called_class is called without an object from outside a class
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        if ($node instanceof Class_ || $node instanceof Trait_) {
+            $this->inClass = true;
+        } elseif ($node instanceof FuncCall && !$this->inClass) {
+            // We'll give any args at all (besides null) a pass.
+            // Technically we should be checking whether the args are objects, but this will do for now.
+            //
+            // @todo switch this to actually validate args when we get context-aware code cleaner passes.
+            if (!empty($node->args) && !$this->isNull($node->args[0])) {
+                return;
+            }
+
+            // We'll ignore name expressions as well (things like `$foo()`)
+            if (!($node->name instanceof Name)) {
+                return;
+            }
+
+            $name = strtolower($node->name);
+            if (in_array($name, ['get_class', 'get_called_class'])) {
+                $msg = sprintf('%s() called without object from outside a class', $name);
+                throw new ErrorException($msg, 0, E_USER_WARNING, null, $node->getLine());
+            }
+        }
+    }
+
+    /**
+     * @param Node $node
+     */
+    public function leaveNode(Node $node)
+    {
+        if ($node instanceof Class_) {
+            $this->inClass = false;
+        }
+    }
+
+    private function isNull(Node $node)
+    {
+        return $node->value instanceof ConstFetch && strtolower($node->value->name) === 'null';
+    }
+}