[commit: ghc] master: Use Test.Regex.PCRE instead of .Posix in compare (5943a5b)

[Ian Lynagh]

Repository : ssh://darcs.haskell.org//srv/darcs/ghc

On branch  : master

http://hackage.haskell.org/trac/ghc/changeset/5943a5b2cf7d5da2d253dec73ee5be6ce870e4ba

>---------------------------------------------------------------

commit 5943a5b2cf7d5da2d253dec73ee5be6ce870e4ba
Author: Ian Lynagh <ian at well-typed.com>
Date:   Sun Jan 27 16:18:06 2013 +0000

    Use Test.Regex.PCRE instead of .Posix in compare
    
    This program:
    
        main :: IO ()
        main = do re "[^ ]" "\207"
                  re "[ ]" "\207"
                  re " " "\207"
    
        re :: String -> String -> IO ()
        re r str = let r' = makeRegex r :: Regex
                       res = matchM r' str :: Maybe (String, String, String, [String])
                   in print res
    
    prints
    
        Nothing
        Nothing
        Nothing
    
    for me with Posix, but
    
        Just ("","\207","",[])
        Nothing
        Nothing
    
    with PCRE. This was causing compare to fail with
    
        Tar line doesn't parse: "drwxrwxr-x simonmar/GHC       0 2012-12-08 21:35 ghc-7.6.1.20121207/libraries/haskeline/tests/dummy-\206\188\206\177\207\\302\\203/"
    
    on the GHC source tarball.

>---------------------------------------------------------------

 distrib/compare/Utils.hs |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/distrib/compare/Utils.hs b/distrib/compare/Utils.hs
index e2da6b5..720f533 100644
--- a/distrib/compare/Utils.hs
+++ b/distrib/compare/Utils.hs
@@ -5,7 +5,7 @@ import Data.Function
 import Data.List
 import System.Exit
 import System.IO
-import Text.Regex.Posix
+import Text.Regex.PCRE
 
 die :: Errors -> IO a
 die errs = do mapM_ (hPutStrLn stderr) errs