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diff --git a/vendor/psy/psysh/src/Command/ListCommand/FunctionEnumerator.php b/vendor/psy/psysh/src/Command/ListCommand/FunctionEnumerator.php
new file mode 100644
index 000000000..733055a60
--- /dev/null
+++ b/vendor/psy/psysh/src/Command/ListCommand/FunctionEnumerator.php
@@ -0,0 +1,112 @@
+<?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 Symfony\Component\Console\Input\InputInterface;
+
+/**
+ * Function Enumerator class.
+ */
+class FunctionEnumerator extends Enumerator
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function listItems(InputInterface $input, \Reflector $reflector = null, $target = null)
+    {
+        // only list functions when no Reflector is present.
+        //
+        // @todo make a NamespaceReflector and pass that in for commands like:
+        //
+        //     ls --functions Foo
+        //
+        // ... for listing functions in the Foo namespace
+
+        if ($reflector !== null || $target !== null) {
+            return;
+        }
+
+        // only list functions if we are specifically asked
+        if (!$input->getOption('functions')) {
+            return;
+        }
+
+        if ($input->getOption('user')) {
+            $label     = 'User Functions';
+            $functions = $this->getFunctions('user');
+        } elseif ($input->getOption('internal')) {
+            $label     = 'Internal Functions';
+            $functions = $this->getFunctions('internal');
+        } else {
+            $label     = 'Functions';
+            $functions = $this->getFunctions();
+        }
+
+        $functions = $this->prepareFunctions($functions);
+
+        if (empty($functions)) {
+            return;
+        }
+
+        $ret = [];
+        $ret[$label] = $functions;
+
+        return $ret;
+    }
+
+    /**
+     * Get defined functions.
+     *
+     * Optionally limit functions to "user" or "internal" functions.
+     *
+     * @param null|string $type "user" or "internal" (default: both)
+     *
+     * @return array
+     */
+    protected function getFunctions($type = null)
+    {
+        $funcs = get_defined_functions();
+
+        if ($type) {
+            return $funcs[$type];
+        } else {
+            return array_merge($funcs['internal'], $funcs['user']);
+        }
+    }
+
+    /**
+     * Prepare formatted function array.
+     *
+     * @param array $functions
+     *
+     * @return array
+     */
+    protected function prepareFunctions(array $functions)
+    {
+        natcasesort($functions);
+
+        // My kingdom for a generator.
+        $ret = [];
+
+        foreach ($functions as $name) {
+            if ($this->showItem($name)) {
+                $ret[$name] = [
+                    'name'  => $name,
+                    'style' => self::IS_FUNCTION,
+                    'value' => $this->presentSignature($name),
+                ];
+            }
+        }
+
+        return $ret;
+    }
+}