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I will follow up with CLs that re-express the nullability inference rules in terms of nullability nodes rather than constraint variables. Change-Id: I6d8492eb83d09dde665ec925d0ac0fde19a3c521 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/98861 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Commit-Queue: Paul Berry <paulberry@google.com>