code: func tuplePointsTo(index int, output []byte) (start int, err error) {
  	offset := big.NewInt(0).SetBytes(output[index : index+32])
  	outputLen := big.NewInt(int64(len(output)))
  
  	if offset.Cmp(big.NewInt(int64(len(output)))) > 0 {
  		return 0, fmt.Errorf("abi: cannot marshal in to go slice: offset %v would go over slice boundary (len=%v)", offset, outputLen)
  	}
  	if offset.BitLen() > 63 {
  		return 0, fmt.Errorf("abi offset larger than int64: %v", offset)
  	}
  	return int(offset.Uint64()), nil
  }
docs: // tuplePointsTo resolves the location reference for dynamic tuple.