[Issue 21184] Unimplemented methods of interface are not reported as errors during compilation.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21184

--- Comment #5 from RazvanN <razvan.nitu1305 at gmail.com> ---
Also, there in the initial example you forgot to inherit from Promise.

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