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diff --git a/vendor/psy/psysh/src/Psy/CodeCleaner/LeavePsyshAlonePass.php b/vendor/psy/psysh/src/Psy/CodeCleaner/LeavePsyshAlonePass.php
deleted file mode 100644
index e6a3bbde8..000000000
--- a/vendor/psy/psysh/src/Psy/CodeCleaner/LeavePsyshAlonePass.php
+++ /dev/null
@@ -1,36 +0,0 @@
-<?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\Variable;
-use Psy\Exception\RuntimeException;
-
-/**
- * Validate that the user input does not reference the `$__psysh__` variable.
- */
-class LeavePsyshAlonePass extends CodeCleanerPass
-{
-    /**
-     * Validate that the user input does not reference the `$__psysh__` variable.
-     *
-     * @throws RuntimeException if the user is messing with $__psysh__
-     *
-     * @param Node $node
-     */
-    public function enterNode(Node $node)
-    {
-        if ($node instanceof Variable && $node->name === '__psysh__') {
-            throw new RuntimeException('Don\'t mess with $__psysh__. Bad things will happen.');
-        }
-    }
-}