Can't use `artisan route:cache` because the built-in cron route uses a closure about cron HOT 5 CLOSED

$ composer create-project --prefer-dist laravel/laravel blog
$ cd blog
$ echo '' > routes/api.php
$ php artisan make:controller HomeController -r
$ echo '<?php Route::get("welcome", "HomeController@index");' > routes/web.php
$ composer require liebig/cron

$ php artisan route:cache -v
Route cache cleared!


   LogicException  : Unable to prepare route [cron.php] for serialization. Uses Closure.

  at /tmp/blog/vendor/laravel/framework/src/Illuminate/Routing/Route.php:880
    876|      */
    877|     public function prepareForSerialization()
    878|     {
    879|         if ($this->action['uses'] instanceof Closure) {
  > 880|             throw new LogicException("Unable to prepare route [{$this->uri}] for serialization. Uses Closure.");
    881|         }
    882| 
    883|         $this->compileRoute();
    884| 

  Exception trace:

  1   Illuminate\Routing\Route::prepareForSerialization()
      /tmp/blog/vendor/laravel/framework/src/Illuminate/Foundation/Console/RouteCacheCommand.php:62

  2   Illuminate\Foundation\Console\RouteCacheCommand::handle()
      /tmp/blog/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php:29

  3   call_user_func_array([])
      /tmp/blog/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php:29

  4   Illuminate\Container\BoundMethod::Illuminate\Container\{closure}()
      /tmp/blog/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php:87

  5   Illuminate\Container\BoundMethod::callBoundMethod(Object(Illuminate\Foundation\Application), Object(Closure))
      /tmp/blog/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php:31

  6   Illuminate\Container\BoundMethod::call(Object(Illuminate\Foundation\Application), [])
      /tmp/blog/vendor/laravel/framework/src/Illuminate/Container/Container.php:564

  7   Illuminate\Container\Container::call()
      /tmp/blog/vendor/laravel/framework/src/Illuminate/Console/Command.php:183

  8   Illuminate\Console\Command::execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Illuminate\Console\OutputStyle))
      /tmp/blog/vendor/symfony/console/Command/Command.php:252

  9   Symfony\Component\Console\Command\Command::run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Illuminate\Console\OutputStyle))
      /tmp/blog/vendor/laravel/framework/src/Illuminate/Console/Command.php:170

  10  Illuminate\Console\Command::run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
      /tmp/blog/vendor/symfony/console/Application.php:865

  11  Symfony\Component\Console\Application::doRunCommand(Object(Illuminate\Foundation\Console\RouteCacheCommand), Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
      /tmp/blog/vendor/symfony/console/Application.php:241

  12  Symfony\Component\Console\Application::doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
      /tmp/blog/vendor/symfony/console/Application.php:143

  13  Symfony\Component\Console\Application::run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
      /tmp/blog/vendor/laravel/framework/src/Illuminate/Console/Application.php:88

  14  Illuminate\Console\Application::run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
      /tmp/blog/vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php:122

  15  Illuminate\Foundation\Console\Kernel::handle(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
      /tmp/blog/artisan:37