What's missing to make D2 feature complete?

[Dicebot via Digitalmars-d]

On Sunday, 21 December 2014 at 09:58:42 UTC, bearophile wrote:
> Dicebot:
>
>>> - tuple support (DIP32, maybe without pattern matching)
>>
>> Nice but not important, unless you mean full tuple redesign 
>> (not realistic)
>
> "Full tuples" (without pattern matching) are quite realistic in 
> D. Tuples have a simple uncontroversial semantics and they get 
> used everywhere.

It would require to break existing semantics of template 
arguments lists and .tupleof and any user code that derives from 
it to get it clean. This is hardly realistic and anything less 
(like DIP32) is simply not useful enough.