[Dlang-internal] implementing Elixir language features into D3

[Dmitry Ponyatov]

- rich pattern matching
   - in data structures
   - function overloading with arg patterns and arbitrary guards
- bitfield expressions and matching
   - (arbitrary bits length from 1 to 64+ and endianness)
- non-preemptive memory-isolated coroutines scheduled over 
generic OS threads
   - async non-blocking message passing
   - `fault and restart` mechanics with supervisors tree
- clustering facilities
   - across isolated OS processes
   - over IP networks
     - (or at least at hardware level, eth100+ with/without RDMA)

Is any of this features too complex to implement or totally does 
not match with D lang computing model or compiler architecture, 
to not whine about adding at least a few of them into the D3?