public override void Codegen(CIntermediateLang cil, IndentingStringBuilder sb)
{
Subscription.Codegen(cil, sb);
var subTmp = cil.LastUsedVar;
Pointer.Codegen(cil, sb);
var sub = string.Format("{0}[{1}]", cil.LastUsedVar, subTmp);
cil.LastUsedVar = sub;
}