This type is equivalent to the existing type `Null`, but we need it
anyway because `Null` can only be accessed via the type provider, and
there are circumstances where we need to create this type and don't
have access to the type provider.
It also may prove beneficial to be able to distinguish between `Null`
and `Never?` in diagnostic messages.
Change-Id: I6118e87c8c4736a508a3f366f2762a96198db7ca
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/103540
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Reviewed-by: Mike Fairhurst <mfairhurst@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Paul Berry
7bbd8ea29d