Go\Core\AspectKernel::hasFeature PHP Method

    public function hasFeature($featureToCheck)
    {
        return ($this->options['features'] & $featureToCheck) !== 0;
    }

 public function __construct(AspectKernel $kernel)
 {
     $this->kernel = $kernel;
     $this->options = $kernel->getOptions();
     $this->cacheDir = $this->options['cacheDir'];
     $this->appDir = $this->options['appDir'];
     if ($this->cacheDir) {
         if (!is_dir($this->cacheDir)) {
             $cacheRootDir = dirname($this->cacheDir);
             if (!is_writable($cacheRootDir) || !is_dir($cacheRootDir)) {
                 throw new \InvalidArgumentException("Can not create a directory {$this->cacheDir} for the cache.\n                        Parent directory {$cacheRootDir} is not writable or not exist.");
             }
             mkdir($this->cacheDir, 0770);
         }
         if (!$this->kernel->hasFeature(Features::PREBUILT_CACHE) && !is_writable($this->cacheDir)) {
             throw new \InvalidArgumentException("Cache directory {$this->cacheDir} is not writable");
         }
         if (file_exists($this->cacheDir . self::CACHE_FILE_NAME)) {
             $this->cacheState = (include $this->cacheDir . self::CACHE_FILE_NAME);
         }
     }
 }