What's missing to make D2 feature complete?

[Kagamin via Digitalmars-d]

On Wednesday, 24 December 2014 at 09:18:43 UTC, Ola Fosheim 
Grøstad wrote:
> Not really, because you should strive to keep mutable state 
> local.

Even if it's local, there are still many similar values to see:
return n>0 ? x : 0;

> Validation does not belong to the implementation, so "the right 
> way" is to put it in a wrapper before you call the function 
> that does the actual work.

Unlikely to be done. Sanitization is usually done in place.

> When functions get long and complicated and evolve over time 
> then all mutable state become a source for errors.

Just wanted to say immutability doesn't look that fool-proof.