What's missing to make D2 feature complete?

[via Digitalmars-d]

On Tuesday, 23 December 2014 at 09:29:20 UTC, Ola Fosheim Grøstad 
wrote:
> parameters that are ref scope restricted and alias free by 
> default. Add tuples. Add ways to express that parameters are

Actually, "alias free" by default might be a bit too much, maybe 
just add "restricted" and a mechanism where the compiler presents 
a warning if optimization was limited by not having a guarantee. 
Then the implementor can add restricted where it is needed to get 
better performance.