static Suit[5] suits = [ {"spades",1,6,"spd"}, {"hearts",4,10,"hrt"}, {"hearts2",4,10,"hrt2"}, {"diamonds",10,16,"dmd"}, {"clubs",11,17,"clb"}
Also, in D it's better to put a space after every comma, to increase readability a little:
static immutable Suit[5] suits = [ {"spades", 1, 6, "spd"}, Bye, bearophile