f601692dd7
This is the shared base class for all representations of the type `Null`. This allows the shared codebase to use `is` tests to tell when a type is `Null`. Change-Id: I98059b60c7eaab9c9f1e3f7addb7913dffc9cf9d Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/396380 Reviewed-by: Chloe Stefantsova <cstefantsova@google.com> Commit-Queue: Paul Berry <paulberry@google.com>