Random access range

[zeljkog]

import std.stdio;

struct Rar{
   int[] data = [1,3,5];
   int length = 3;
   ref int opIndex(int i){ return data[i];}
}

void main() {
   Rar x;
   foreach (e; x)
   writeln(e);
}

Error: invalid foreach aggregate x
----

Is'nt Rar valid random access range?