src/ControllerDocumentation.php
protected function getControllerMethod($methodName)
    {
        $reflectionMethod = $this->reflectedController->getMethod($methodName);
        $reflectionMethod->setAccessible(true);
        return function () use ($reflectionMethod) {
            return $reflectionMethod->invokeArgs($this->controller, func_get_args());
        };
    }
protected function getControllerMethod($methodName)
    {
        $reflectionMethod = $this->reflectedController->getMethod($methodName);
        $reflectionMethod->setAccessible(true);
        return function () use ($reflectionMethod) {
            return $reflectionMethod->invokeArgs($this->controller, func_get_args());
        };
    }
Gets a callable method from the original controller.

Given a method name in the controller, this method will return a
callable function that will invoke the method with any arguments you
provide.

@param string $methodName
@return \Closure