尝试在OS X中使用openFile时不允许操作

Question

尝试使用下面的Haskell代码在Mac上读取文件时，我收到一条错误，即权限被拒绝：操作不被允许。

import System.IO

main :: IO ()
main = do
  inh <- openFile "/Users/lambda/Downloads/file.doc" ReadMode
  inpStr <- hGetContents inh
  let [(result,_)] = parse allDigits inpStr
  putStr result
  hClose inh

result : ** Exception: /Users/lambda/Downloads/file.doc: openFile: permission denied (Operation not permitted)