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This is analogous how we do it for [PolymorphicDispatchers] Change-Id: I3b3187ebe11f50659cd89ed01d9fb4b29ab207c5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/382580 Reviewed-by: Nate Biggs <natebiggs@google.com> Commit-Queue: Martin Kustermann <kustermann@google.com>