LetExp([
 TypeDec[
  (rectype,
   RecordTy[
    (name,true,string),
    (id,true,int)])],
 VarDec(b,true,SOME(rectype),
  NilExp)],
 SeqExp[
  OpExp(EqOp,
   VarExp(
    SimpleVar(b)),
   NilExp),
  OpExp(NeqOp,
   VarExp(
    SimpleVar(b)),
   NilExp)])