do D support something like C# 4.0 co/contra-variance?

[Michal Minich]

On Thu, 02 Sep 2010 07:38:24 -0400, bearophile wrote:

> dennis:
>> http://blog.t-l-k.com/dot-net/2009/c-sharp-4-covariance-and-
contravariance
> 
> I think D2 doesn't support those things yes. But they are useful and may
> be added to D3.
> 
> Bye,
> bearophile

I just found...
http://digitalmars.com/d/2.0/phobos/std_traits.html#isCovariantWith