lib/Twig/Loader/Themes.php
public function getSource($name)
    {
        $name = $this->prepareName($name);
        return $this->fsloader->getSource($name);
    }
public function getSource($name)
    {
        $name = $this->prepareName($name);
        return $this->fsloader->getSource($name);
    }
{@inheritdoc}