Feedback on Átila's Vision for D

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On Saturday, 19 October 2019 at 15:55:38 UTC, Max Samukha wrote:
> On Friday, 18 October 2019 at 16:10:31 UTC, Atila Neves wrote:
>
>>
>> I don't understand what you mean by this. What is it about OOP 
>> in D now that you can't get done without a library solution? 
>> And why are library solutions insufficient for those purposes?
>
> One cringeworthy problem with D's implementation of interfaces 
> and classes is how D resolves method conflicts. Conflicting 
> interface methods are silently collapsed into one 
> implementation, which seems to be by design and is definitely 
> incorrect.
>
> interface Display {
>   void fmt();
> }
>
> interface Debug {
>   void fmt();
> }
>
> class C: Display, Debug {
>   override fmt() {  } // implements both interfaces
> }
>
> At the very least, this should be an ambiguity error. Some 
> languages (C#, Rust) allow to disambiguate.

It's not a defect. Interfaces have no state, so it doesn't matter 
which is called. Java does the same thing.