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The Dart 3.0 libraries will mark Iterator with the interface class modifier, which prevents extends. It will do so because the class has no implementation to inherit, and is only intended as an interface, which it is now possible to express. This should unblock relanding https://dart-review.googlesource.com/c/sdk/+/287760 (Also working on disabling the class-modifiers experiment for Flutter dart: libraries, which was enabled along with the Dart SDK libraries, until the experiment can be intentionally turned back on.)