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diff --git a/vendor/psy/psysh/src/Psy/CodeCleaner/FunctionReturnInWriteContextPass.php b/vendor/psy/psysh/src/Psy/CodeCleaner/FunctionReturnInWriteContextPass.php
new file mode 100644
index 000000000..fd3430eaa
--- /dev/null
+++ b/vendor/psy/psysh/src/Psy/CodeCleaner/FunctionReturnInWriteContextPass.php
@@ -0,0 +1,82 @@
+<?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\Expr\Array_ as ArrayNode;
+use PhpParser\Node\Expr\Assign as AssignNode;
+use PhpParser\Node\Expr\Empty_ as EmptyNode;
+use PhpParser\Node\Expr\FuncCall as FunctionCall;
+use PhpParser\Node\Expr\Isset_ as IssetNode;
+use PhpParser\Node\Expr\MethodCall;
+use PhpParser\Node\Expr\StaticCall;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * Validate that the functions are used correctly.
+ *
+ * @author Martin Hasoň <martin.hason@gmail.com>
+ */
+class FunctionReturnInWriteContextPass extends CodeCleanerPass
+{
+    const EXCEPTION_MESSAGE = "Can't use function return value in write context";
+
+    private $isPhp55;
+
+    public function __construct()
+    {
+        $this->isPhp55 = version_compare(PHP_VERSION, '5.5', '>=');
+    }
+
+    /**
+     * Validate that the functions are used correctly.
+     *
+     * @throws FatalErrorException if a function is passed as an argument reference
+     * @throws FatalErrorException if a function is used as an argument in the isset
+     * @throws FatalErrorException if a function is used as an argument in the empty, only for PHP < 5.5
+     * @throws FatalErrorException if a value is assigned to a function
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        if ($node instanceof ArrayNode || $this->isCallNode($node)) {
+            $items = $node instanceof ArrayNode ? $node->items : $node->args;
+            foreach ($items as $item) {
+                if ($item->byRef && $this->isCallNode($item->value)) {
+                    throw new FatalErrorException(self::EXCEPTION_MESSAGE);
+                }
+            }
+        } elseif ($node instanceof IssetNode) {
+            foreach ($node->vars as $var) {
+                if (!$this->isCallNode($var)) {
+                    continue;
+                }
+
+                if ($this->isPhp55) {
+                    throw new FatalErrorException('Cannot use isset() on the result of a function call (you can use "null !== func()" instead)');
+                } else {
+                    throw new FatalErrorException(self::EXCEPTION_MESSAGE);
+                }
+            }
+        } elseif ($node instanceof EmptyNode && !$this->isPhp55 && $this->isCallNode($node->expr)) {
+            throw new FatalErrorException(self::EXCEPTION_MESSAGE);
+        } elseif ($node instanceof AssignNode && $this->isCallNode($node->var)) {
+            throw new FatalErrorException(self::EXCEPTION_MESSAGE);
+        }
+    }
+
+    private function isCallNode(Node $node)
+    {
+        return $node instanceof FunctionCall || $node instanceof MethodCall || $node instanceof StaticCall;
+    }
+}