Route login not defined .. What's the problem?

Question

Laravel

When I go to the main page or any page in Laravel, I get an error .. Login not defined .. The
request is sent as a get behind the view itself ..
What is the reason for the error specifically about the login?
Why does the error occur when going to any page?
This error in the browser appears with the first option.

This page isn’t working
localhost redirected you too many times.

Route::get('/login',['as'=>'login', function () {
    return view('login');
}]);

login not defined in the second option ..

Route::get('/login', function () {
    return view('login');
});