On Wed, Feb 19, 2014 at 2:18 PM, Bienlein <jeti789 at web.de> wrote: > 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 :-) It won't work, since binary + is not defined for strings. I don't understand what you want, here.