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?