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diff --git a/vendor/psy/psysh/src/Psy/CodeCleaner/LegacyEmptyPass.php b/vendor/psy/psysh/src/Psy/CodeCleaner/LegacyEmptyPass.php
new file mode 100644
index 000000000..f0c89402c
--- /dev/null
+++ b/vendor/psy/psysh/src/Psy/CodeCleaner/LegacyEmptyPass.php
@@ -0,0 +1,64 @@
+<?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\Empty_ as ExprEmpty;
+use PhpParser\Node\Expr\Variable;
+use Psy\Exception\ParseErrorException;
+
+/**
+ * Validate that the user did not call the language construct `empty()` on a
+ * statement in PHP < 5.5.
+ */
+class LegacyEmptyPass extends CodeCleanerPass
+{
+    /**
+     * Validate use of empty in PHP < 5.5.
+     *
+     * @throws ParseErrorException if the user used empty with anything but a variable
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        if (version_compare(PHP_VERSION, '5.5', '>=')) {
+            return;
+        }
+
+        if (!$node instanceof ExprEmpty) {
+            return;
+        }
+
+        if (!$node->expr instanceof Variable) {
+            $msg = sprintf('syntax error, unexpected %s', $this->getUnexpectedThing($node->expr));
+
+            throw new ParseErrorException($msg, $node->expr->getLine());
+        }
+    }
+
+    private function getUnexpectedThing(Node $node)
+    {
+        switch ($node->getType()) {
+            case 'Scalar_String':
+            case 'Scalar_LNumber':
+            case 'Scalar_DNumber':
+                return json_encode($node->value);
+
+            case 'Expr_ConstFetch':
+                return (string) $node->name;
+
+            default:
+                return $node->getType();
+        }
+    }
+}