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diff --git a/vendor/psy/psysh/src/Command/ListCommand/VariableEnumerator.php b/vendor/psy/psysh/src/Command/ListCommand/VariableEnumerator.php
new file mode 100644
index 000000000..257ceac53
--- /dev/null
+++ b/vendor/psy/psysh/src/Command/ListCommand/VariableEnumerator.php
@@ -0,0 +1,137 @@
+<?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\Command\ListCommand;
+
+use Psy\Context;
+use Psy\VarDumper\Presenter;
+use Symfony\Component\Console\Input\InputInterface;
+
+/**
+ * Variable Enumerator class.
+ */
+class VariableEnumerator extends Enumerator
+{
+    // n.b. this array is the order in which special variables will be listed
+    private static $specialNames = [
+        '_', '_e', '__out', '__function', '__method', '__class', '__namespace', '__file', '__line', '__dir',
+    ];
+
+    private $context;
+
+    /**
+     * Variable Enumerator constructor.
+     *
+     * Unlike most other enumerators, the Variable Enumerator needs access to
+     * the current scope variables, so we need to pass it a Context instance.
+     *
+     * @param Presenter $presenter
+     * @param Context   $context
+     */
+    public function __construct(Presenter $presenter, Context $context)
+    {
+        $this->context = $context;
+        parent::__construct($presenter);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function listItems(InputInterface $input, \Reflector $reflector = null, $target = null)
+    {
+        // only list variables when no Reflector is present.
+        if ($reflector !== null || $target !== null) {
+            return;
+        }
+
+        // only list variables if we are specifically asked
+        if (!$input->getOption('vars')) {
+            return;
+        }
+
+        $showAll   = $input->getOption('all');
+        $variables = $this->prepareVariables($this->getVariables($showAll));
+
+        if (empty($variables)) {
+            return;
+        }
+
+        return [
+            'Variables' => $variables,
+        ];
+    }
+
+    /**
+     * Get scope variables.
+     *
+     * @param bool $showAll Include special variables (e.g. $_)
+     *
+     * @return array
+     */
+    protected function getVariables($showAll)
+    {
+        $scopeVars = $this->context->getAll();
+        uksort($scopeVars, function ($a, $b) {
+            $aIndex = array_search($a, self::$specialNames);
+            $bIndex = array_search($b, self::$specialNames);
+
+            if ($aIndex !== false) {
+                if ($bIndex !== false) {
+                    return $aIndex - $bIndex;
+                }
+
+                return 1;
+            }
+
+            if ($bIndex !== false) {
+                return -1;
+            }
+
+            return strnatcasecmp($a, $b);
+        });
+
+        $ret = [];
+        foreach ($scopeVars as $name => $val) {
+            if (!$showAll && in_array($name, self::$specialNames)) {
+                continue;
+            }
+
+            $ret[$name] = $val;
+        }
+
+        return $ret;
+    }
+
+    /**
+     * Prepare formatted variable array.
+     *
+     * @param array $variables
+     *
+     * @return array
+     */
+    protected function prepareVariables(array $variables)
+    {
+        // My kingdom for a generator.
+        $ret = [];
+        foreach ($variables as $name => $val) {
+            if ($this->showItem($name)) {
+                $fname = '$' . $name;
+                $ret[$fname] = [
+                    'name'  => $fname,
+                    'style' => in_array($name, self::$specialNames) ? self::IS_PRIVATE : self::IS_PUBLIC,
+                    'value' => $this->presentRef($val),
+                ];
+            }
+        }
+
+        return $ret;
+    }
+}