On Sunday, 20 October 2019 at 21:45:35 UTC, Robert M. Münch wrote:
class myWidget : Observer!message {...}

class FilterSubject : SubjectObject!message {
 Disposable subscribe(myWidget observer){...}
}


I tried to add "alias subscribe = SubjectObject.subscribe;" in different places, but that didn't help. Nor do I have any how that should help...

This should work:

class FilterSubject : SubjectObject!message {
  alias subscribe = typeof(super).subscribe;
  Disposable subscribe(myWidget observer){...}
}

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