Upgrade Twig library

inc/lib/Twig/Function/Function.php

@@ -13,8 +13,10 @@
 /**
  * Represents a function template function.
  *
- * @package    twig
- * @author     Arnaud Le Blanc <arnaud.lb@gmail.com>
+ * Use Twig_SimpleFunction instead.
+ *
+ * @author Arnaud Le Blanc <arnaud.lb@gmail.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
  */
 class Twig_Function_Function extends Twig_Function
 {
@@ -22,6 +24,8 @@ class Twig_Function_Function extends Twig_Function
 
     public function __construct($function, array $options = array())
     {
+        $options['callable'] = $function;
+
         parent::__construct($options);
 
         $this->function = $function;