Default method implementations in interfaces?

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On Friday, 23 October 2015 at 15:07:05 UTC, Alex Parrill wrote:
> Use template mixins: http://dlang.org/template-mixin.html

On Friday, 23 October 2015 at 15:08:30 UTC, Adam D. Ruppe wrote:
> Use a mixin template together with your interface.

Awesome, thanks!

No way, though, to unite declaration and implementation? Feels a 
little too much like endless header files to me.