43db92d9ed
In following CLs I plan to add `final` and `sealed` modifiers. Change-Id: Ia6b9091034ed9f8f6f8576dbe6029d7e72a9d6b3 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/315249 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com> Reviewed-by: Samuel Rawlins <srawlins@google.com>