PHP-CS-Fixer: wrong files included

Hey,

For a project, I have the following configuration:

// .php_cs.dist
<?php

declare(strict_types=1);

use PhpCsFixer\Config;
use PhpCsFixer\Finder;

$finder = Finder::create()
    ->in([
        __DIR__.'/src',
        __DIR__.'/tests'
    ])
;

return Config::create()
    ->setRiskyAllowed(true)
    ->setRules([...])
    ->setFinder($finder)
;

Yet, when I run it, I can see that the file var/SymfonyRequirements.php is affected. Is it the expected behaviour? (I wouldn’t expect other directories than the one specified to be appended).

$ php -v
PHP 7.1.0-dev (cli) (built: Jan  3 2017 09:51:30) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.1.0-dev, Copyright (c) 1998-2016 Zend Technologies

PHP CS Fixer version you are using:

$ php-cs-fixer -V
PHP CS Fixer 2.0.0