Drush cache clear doesn't work with latest 8.x HEAD

Problem/Motivation

The service definition "router.builder" does not exist. in
Symfony\Component\DependencyInjection\ContainerBuilder->getDefinition()
(line 690 of
/www/drupal-8.x/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php).
Symfony\Component\DependencyInjection\Exception\InvalidArgumentException: The service definition "router.builder" does not exist. in Symfony\Component\DependencyInjection\ContainerBuilder->getDefinition() (line 690 of /www/drupal-8.x/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php).
Drush command terminated abnormally due to an unrecoverable error. [error]

Done.

Site install functions fine, so it's not breaking everything.

Steps to reprodoce:

1. Clone latest HEAD of drush
2. Clone latest HEAD of 8.x drupal core
3. drush si
4. drush cc all

Proposed resolution

Remaining tasks

User interface changes

API changes