go_router will need to be updated before this can land: flutter/packages#9434

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@justinmc Good question! I added this to the PR description:

In the Flutter framework, only the foundation library is allowed to import package:meta. If other parts of the Flutter framework want to use package:meta, they must do so through the foundation library by exporting the desired package:meta member from the foundation library. This requirement is enforced through dev/bots/analyze.dart here.

It's not very clear to me why the Flutter framework has this package:meta restriction though.