/usr/share/php/Twig/Node/SetTemp.php is in php-twig 1.23.1-1ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
 * This file is part of Twig.
 *
 * (c) 2011 Fabien Potencier
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
class Twig_Node_SetTemp extends Twig_Node
{
    public function __construct($name, $lineno)
    {
        parent::__construct(array(), array('name' => $name), $lineno);
    }
    public function compile(Twig_Compiler $compiler)
    {
        $name = $this->getAttribute('name');
        $compiler
            ->addDebugInfo($this)
            ->write('if (isset($context[')
            ->string($name)
            ->raw('])) { $_')
            ->raw($name)
            ->raw('_ = $context[')
            ->repr($name)
            ->raw(']; } else { $_')
            ->raw($name)
            ->raw("_ = null; }\n")
        ;
    }
}
 |