src/Container.php
public function raw($idOrClosure)
    {
        if (is_object($idOrClosure) && method_exists($idOrClosure, "__invoke")) {
            $this->raws->attach($idOrClosure);

            return $idOrClosure;
        }

        if (!isset($this->definitions[$idOrClosure])) {
            return null;
        }

        return $this->definitions[$idOrClosure];
    }
public function raw($idOrClosure)
    {
        if (is_object($idOrClosure) && method_exists($idOrClosure, "__invoke")) {
            $this->raws->attach($idOrClosure);

            return $idOrClosure;
        }

        if (!isset($this->definitions[$idOrClosure])) {
            return null;
        }

        return $this->definitions[$idOrClosure];
    }
Returns a raw definition. Used when a closure is set and
you want to get the closure not the result of it.

@param string $idOrClosure

@return mixed Returns whatever it is stored in the key. NULL if
nothing is stored.