int f1(ref const int p)    { return p; }

int f2(ref const int[2] p) { return p[0] + p[1]; }

​

void main()

{

    static immutable int[2] P = [ 0, 1 ];

    //static assert(f1(P[0]) == 0);

    static assert(f2(P) == 1);

}

​