Haskell System.Directory.doesFileExist和非ASCII路径

Question

import System.Directory
import qualified Data.ByteString as BS  
import qualified Data.ByteString.UTF8 as BS_UTF8

main = do
    putStrLn "Input path to some file: "
    raw_inputed_path <- BS.getLine
    let inputed_path = BS_UTF8.toString raw_inputed_path
    such_file_exists <- doesFileExist inputed_path
    such_directory_exists <- doesDirectoryExist inputed_path
    if such_file_exists 
        then putStrLn "Yeah, I see it!"
        else if such_directory_exists
            then putStrLn "Aha, I see it, but it's a directory!"
            else putStrLn "Hmm... No such..."

此代码仅适用于ASCII路径。但是，如果我使用带有非ASCII符号的路径，则doesFileExist和doesDirectoryExist始终返回False。为什么呢？

• Debian GNU / Linux 6.0 x86_64
• ghc 6.12.1

Answer 1

升级到GHC 7.x系列 - 6.12现在已经过时了近3年。这种行为是在一年前修复的。