code: public function getCacheFilename($name)
      {
          @trigger_error(sprintf('The %s method is deprecated since version 1.22 and will be removed in Twig 2.0.', __METHOD__), E_USER_DEPRECATED);
  
          $key = $this->cache->generateKey($name, $this->getTemplateClass($name));
  
          return !$key ? false : $key;
      }
docs: Gets the cache filename for a given template.
  
  @param string $name The template name
  
  @return string|false The cache file name or false when caching is disabled
  
  @deprecated since 1.22 (to be removed in 2.0)