compile time opCall array assignment

[strtr]

struct S{
        int[2] arr = 0;

        static S opCall( int i1_, int i2_) {
                S res = void;
                res.arr[0] = i1_;
                res.arr[1] = i2_;
                return res;
        }
}

const S CS= S(0,0);

Why can't this be evaluated at compile time?
(And how do I fix it :))