Data-Oriented Demo: SOA, composition via crazy 'using'

[thedeemon via Digitalmars-d]

On Wednesday, 21 January 2015 at 19:12:21 UTC, Fool wrote:
>  - a keyword preliminary called 'using' which seems to be quite 
> close to 'alias this';

By the way, what's the current status with multiple `alias this`?