What's missing to make D2 feature complete?

[ketmar via Digitalmars-d]

On Mon, 22 Dec 2014 11:17:39 +0000
via Digitalmars-d <digitalmars-d at puremagic.com> wrote:

> On Monday, 22 December 2014 at 11:03:33 UTC, bioinfornatics wrote:
> > - use everywhere as possible immutability ( const ref, in,
> > immutable )
> 
> Thanks, I forgot that one. Immutable values by default is indeed 
> an important improvement. All by-value parameters to functions 
> should be immutable, period.

but why? O_O
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