The most awesome "forward to member" solution?

[Meta via Digitalmars-d]

On Monday, 4 May 2015 at 01:01:05 UTC, Andrei Alexandrescu wrote:
> Hmm, I didn't try it assuming it won't work (thought 
> __traits(getMember, member, sym) would fail with opDispatch). 
> Tried it just now, it does work like a charm. Thanks!
>
> Andrei

So is a function that generates a string mixin necessary or not 
necessary?