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See mentions of migrating from legacy syntax from back when it was ongoing: https://g-issues.chromium.org/issues/40170614#comment36 Change-Id: If592c5bcf40b2e56f9b18fcf27f74d767f97375a Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/356041 Reviewed-by: William Hesse <whesse@google.com> Reviewed-by: Daco Harkes <dacoharkes@google.com> Commit-Queue: Oleh Prypin <oprypin@google.com>