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There are still 2 left in AbstractScanner. The usual trick with factory constructor does not work there. Change-Id: Iaa5d88468c8cb17c34a9f73ab93ef97251a1bd76 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/182881 Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>