DIP66 - Multiple alias this

[Paul Backus]

On Tuesday, 29 September 2020 at 13:17:50 UTC, 12345swordy wrote:
>
> You could take Manu Evans advice and allow structs to inherent 
> from other structs traditionally like in c++ and deprecate 
> alias this.
>
> That would solve 80 percent of the problem.
>
> - Alex

I did a grep for `alias this` in Phobos last time this topic came 
up. By my count, use of `alias this` was split almost exactly 
50/50 between forwarding to a member variable and forwarding to 
the result of a method.