protected function optimizeVariables($node, $env) {
if ('Twig_Node_Expression_Name' === get_class($node) && $node
->isSimple()) {
$this->prependedNodes[0][] = $node
->getAttribute('name');
return new Twig_Node_Expression_TempName($node
->getAttribute('name'), $node
->getLine());
}
return $node;
}