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This follows to the change to the specification. https://github.com/dart-lang/language/pull/1106 R=brianwilkerson@google.com Change-Id: I6575f201161c454de98e9bcbec74b9974d91d062 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/155242 Commit-Queue: Konstantin Shcheglov <scheglov@google.com> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>