Update Twig to v2.15.4

system/libs/Twig/Loader/ExistsLoaderInterface.php

@@ -12,22 +12,12 @@
 namespace Twig\Loader;
 
 /**
- * Adds an exists() method for loaders.
+ * Empty interface for Twig 1.x compatibility.
  *
- * @author Florin Patan <florinpatan@gmail.com>
- *
- * @deprecated since 1.12 (to be removed in 3.0)
+ * @deprecated since Twig 2.7, to be removed in 3.0
  */
-interface ExistsLoaderInterface
+interface ExistsLoaderInterface extends LoaderInterface
 {
-    /**
-     * Check if we have the source code of a template, given its name.
-     *
-     * @param string $name The name of the template to check if we can load
-     *
-     * @return bool If the template source code is handled by this loader or not
-     */
-    public function exists($name);
 }
 
 class_alias('Twig\Loader\ExistsLoaderInterface', 'Twig_ExistsLoaderInterface');