Recent improvements

[Bienlein]

On Wednesday, 19 February 2014 at 12:43:10 UTC, Philippe Sigaud 
wrote:
>
> What bearophile wanted was, on the contrary, to have a
> specialized-for-summing function, if only to make the intended
> behavior more clear.

I see. Unhappily, I don't have a D compiler handy. Would this 
compile:

immutable s = ["red", "blue"].sum

If not, it would be interesting to understand how that works :-)

-- Bienlein