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diff --git a/vendor/psy/psysh/src/Reflection/ReflectionLanguageConstructParameter.php b/vendor/psy/psysh/src/Reflection/ReflectionLanguageConstructParameter.php
new file mode 100644
index 000000000..af1f4cb48
--- /dev/null
+++ b/vendor/psy/psysh/src/Reflection/ReflectionLanguageConstructParameter.php
@@ -0,0 +1,103 @@
+<?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\Reflection;
+
+/**
+ * A fake ReflectionParameter but for language construct parameters.
+ *
+ * It stubs out all the important bits and returns whatever was passed in $opts.
+ */
+class ReflectionLanguageConstructParameter extends \ReflectionParameter
+{
+    private $function;
+    private $parameter;
+    private $opts;
+
+    public function __construct($function, $parameter, array $opts)
+    {
+        $this->function  = $function;
+        $this->parameter = $parameter;
+        $this->opts      = $opts;
+    }
+
+    /**
+     * No class here.
+     */
+    public function getClass()
+    {
+        return;
+    }
+
+    /**
+     * Is the param an array?
+     *
+     * @return bool
+     */
+    public function isArray()
+    {
+        return array_key_exists('isArray', $this->opts) && $this->opts['isArray'];
+    }
+
+    /**
+     * Get param default value.
+     *
+     * @return mixed
+     */
+    public function getDefaultValue()
+    {
+        if ($this->isDefaultValueAvailable()) {
+            return $this->opts['defaultValue'];
+        }
+    }
+
+    /**
+     * Get param name.
+     *
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->parameter;
+    }
+
+    /**
+     * Is the param optional?
+     *
+     * @return bool
+     */
+    public function isOptional()
+    {
+        return array_key_exists('isOptional', $this->opts) && $this->opts['isOptional'];
+    }
+
+    /**
+     * Does the param have a default value?
+     *
+     * @return bool
+     */
+    public function isDefaultValueAvailable()
+    {
+        return array_key_exists('defaultValue', $this->opts);
+    }
+
+    /**
+     * Is the param passed by reference?
+     *
+     * (I don't think this is true for anything we need to fake a param for)
+     *
+     * @return bool
+     */
+    public function isPassedByReference()
+    {
+        return array_key_exists('isPassedByReference', $this->opts) && $this->opts['isPassedByReference'];
+    }
+}