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Dart documentation: Use sound parameter types when overriding methods

I am reading the Dart documentation on The Dart type system and quite don't understand the example in the Use sound return types when overriding methods:

This is supposedly correct:

class HoneyBadger extends Animal {
  @override
  void chase(Animal a) { ... }

  @override
  HoneyBadger get parent => ...
}

but this isn't:

class Root extends Animal {
  @override
  void chase(Animal a) { ... }

  @override
  Root get parent => ...
}

But the examples are exactly the same - they both extends the Animal class. What I am missing?

Solution

  • This got fixed and the page now has a correct example:

    class HoneyBadger extends Animal {
  @override
  void chase(Animal a) { ... }

  @override
  Root get parent => ...
}