Error in php artisan route:cache

My api.php code is like below

Route::middleware('auth:api')->get('/user', function (Request $request) {
        return $request->user();
});

I tried to run php artisan route:cache and getting error like below

Level 4

The problem is a route which uses a Closure instead of a controller, which looks something like this:

//                       Thats the Closure
//                             v 
Route::get('/some/route', function() {
    return 'Hello World';
});

Since Closures can not be serialized, you can not cache your routes when you have routes which use closures.

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