/usr/share/php/Twig/TokenParser/AutoEscape.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) 2009 Fabien Potencier
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
/**
 * Marks a section of a template to be escaped or not.
 *
 * <pre>
 * {% autoescape true %}
 *   Everything will be automatically escaped in this block
 * {% endautoescape %}
 *
 * {% autoescape false %}
 *   Everything will be outputed as is in this block
 * {% endautoescape %}
 *
 * {% autoescape true js %}
 *   Everything will be automatically escaped in this block
 *   using the js escaping strategy
 * {% endautoescape %}
 * </pre>
 */
class Twig_TokenParser_AutoEscape extends Twig_TokenParser
{
    public function parse(Twig_Token $token)
    {
        $lineno = $token->getLine();
        $stream = $this->parser->getStream();
        if ($stream->test(Twig_Token::BLOCK_END_TYPE)) {
            $value = 'html';
        } else {
            $expr = $this->parser->getExpressionParser()->parseExpression();
            if (!$expr instanceof Twig_Node_Expression_Constant) {
                throw new Twig_Error_Syntax('An escaping strategy must be a string or a bool.', $stream->getCurrent()->getLine(), $stream->getFilename());
            }
            $value = $expr->getAttribute('value');
            $compat = true === $value || false === $value;
            if (true === $value) {
                $value = 'html';
            }
            if ($compat && $stream->test(Twig_Token::NAME_TYPE)) {
                @trigger_error('Using the autoescape tag with "true" or "false" before the strategy name is deprecated.', E_USER_DEPRECATED);
                if (false === $value) {
                    throw new Twig_Error_Syntax('Unexpected escaping strategy as you set autoescaping to false.', $stream->getCurrent()->getLine(), $stream->getFilename());
                }
                $value = $stream->next()->getValue();
            }
        }
        $stream->expect(Twig_Token::BLOCK_END_TYPE);
        $body = $this->parser->subparse(array($this, 'decideBlockEnd'), true);
        $stream->expect(Twig_Token::BLOCK_END_TYPE);
        return new Twig_Node_AutoEscape($value, $body, $lineno, $this->getTag());
    }
    public function decideBlockEnd(Twig_Token $token)
    {
        return $token->test('endautoescape');
    }
    public function getTag()
    {
        return 'autoescape';
    }
}
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