public function visitLate(LateBinding $late)
 {
     $key = $late->getKey();
     $resolution = $this->locator->get($key);
     if (empty($resolution)) {
         throw new ConfigurationException("Missing binding for {$key}");
     }
 }
 public function visitLate(LateBinding $late)
 {
     $this->bindings->get($late->getKey())->accept($this);
 }