Additionally, report the error on the 'await' keyword instead of 'in' Change-Id: I0ccd156f19997eb18b5df004a75f86e616b23864 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/301021 Commit-Queue: Chloe Stefantsova <cstefantsova@google.com> Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Reviewed-by: Johnni Winther <johnniwinther@google.com>