/**
  * Register a new resolving callback.
  *
  * @param string $abstract
  * @param \Closure|null $callback
  * @return void 
  * @static 
  */
 public static function resolving($abstract, $callback = null)
 {
     //Method inherited from \Illuminate\Container\Container
     \Laravel\Lumen\Application::resolving($abstract, $callback);
 }