try:
  let d = newSeq[int]()
  echo "value: ", d[2]
except:
  let e = getCurrentException()
  echo "異常對象: ",repr(e), " 異常信息: ", getCurrentExceptionMsg()
  echo "另一種獲取異常信息的方法: ", e.msg
finally:
  echo "end"

try:
  #  ....
except OverflowError:
  # ...
finally:
  #...