[Laravel] withErrors()でバリデーションエラー以外のメッセージを返す

return Redirect::to('admin/users/create')
->withInput()
->withErrors(['message' => 'Login field is required.']);

laravel – How to use withErrors with Exception error messages in Laravel4? – Stack Overflow
http://stackoverflow.com/questions/18367769/how-to-use-witherrors-with-exception-error-messages-in-laravel4