The nullability on the LHS of type-parameter types is assumed to be set
explicitly, at the moment of creation of the type or some time after
that. The latter case is needed for when the bound of the corresponding
type parameter is not yet set.
The second change is that the overall nullability is not stored in a
field, but is computed as a getter.
Change-Id: Ifbe6922c3a17943dd6c4f054976516c4f6bfc96d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/115209
Commit-Queue: Dmitry Stefantsov <dmitryas@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Dmitry Stefantsov
8ee22c246e