On Sunday, 11 August 2019 at 13:09:43 UTC, John Colvin wrote:
Ok. What would go wrong (in D) if I just replaced every interface with an abstract class?

I think there's some confusion here, because B.foo is not abstract. abstract on a class is not inherited by its methods. https://dlang.org/spec/attribute.html#abstract

Now, I'm confused, as you asked about abstract classes. So, yes, you can define the abstractness of classes differently. And what is your point?

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