On Friday, 11 August 2017 at 17:57:30 UTC, Dominikus Dittes Scherkl wrote:

On Friday, 11 August 2017 at 10:45:03 UTC, Mike Parker wrote:

The first stage of the formal review for DIP 1011 [1], "extern(delegate)", is now underway.

I see no problem with this DIP.
And even if the usecase is rare, I think it is worth the new syntax (and thereby increased complexity of the language) to be able to do this in a type-safe way.

So: +1

+1 from me too. I'm not sure that it will stay rare. This is the kind of feature that can open up a real new class of usage that are not known yet. In short, this feature may bring duck typing to another level.