src/Context/Argument/LaravelArgumentResolver.php
private function resolveArgument($arg)
    {
        if (substr($arg, 0, 1) === '@') {
            return $this->app->make(substr($arg, 1));
        }

        return $arg;
    }
private function resolveArgument($arg)
    {
        if (substr($arg, 0, 1) === '@') {
            return $this->app->make(substr($arg, 1));
        }

        return $arg;
    }
Resolve argument

@param  string $arg
@return object