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These will be added in https://dart-review.googlesource.com/c/sdk/+/74664. Change-Id: I9712d8f9df72e686dd49e0b5198aa37e17815eb5 Reviewed-on: https://dart-review.googlesource.com/71228 Reviewed-by: Lasse R.H. Nielsen <lrn@google.com> Reviewed-by: Vijay Menon <vsm@google.com> Commit-Queue: Jenny Messerly <jmesserly@google.com>