unicode regression

This program now fails:

$ touch `printf "a1\243a"`
$ ls -b a*
a1\243a
$ cat q.hs

import Data.List
import System.Directory

main :: IO ()
main = do xs <- getDirectoryContents "."
          let ys = filter ("a" `isPrefixOf`) xs
          print ys
          mapM_ removeFile ys

$ ghc --make q
$ ./q
["a1\61347a"]
q: a1�a: removeLink: does not exist (No such file or directory)
$ ls -b a*
a1\243a
$

Max says:

This program should work unmodified. The fact that it doesn't
demonstrates that I need to replace some instances of the
Foreign.C.*CString functions with their escape-handling counterparts
(withFilePath and friends). Although I fixed this in some libraries I
apparently forgot to do so in others.

Alternatively, I could change the Foreign.C functions to do the Right
Thing with escape characters. This would strictly be in violation of
the FFI spec though it would make it vastly more probable that 3rd
party libraries would work correctly with strings containing
surrogates.

Trac metadata

Trac field	Value
Version	7.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	high
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture