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The `PackedString' type

You need to `import PackedString' and heave in your `-syslib ghc' to use `PackedString's. The basic type and functions available are: 
data PackedString -- abstract

packString          :: [Char] -> PackedString
packStringST        :: [Char] -> ST s PackedString
packCBytesST        :: Int -> Addr -> ST s PackedString
packBytesForCST     :: [Char] -> ST s (ByteArray Int)
byteArrayToPS       :: ByteArray Int -> PackedString
unsafeByteArrayToPS :: ByteArray a   -> Int -> PackedString
psToByteArray       :: PackedString -> ByteArray Int
psToByteArrayST     :: PackedString -> ST s (ByteArray Int)

unpackPS        :: PackedString -> [Char]
We also provide a wad of list-manipulation-like functions: 
nilPS       :: PackedString
consPS      :: Char -> PackedString -> PackedString

headPS      :: PackedString -> Char
tailPS      :: PackedString -> PackedString
nullPS      :: PackedString -> Bool
appendPS    :: PackedString -> PackedString -> PackedString
lengthPS    :: PackedString -> Int
indexPS     :: PackedString -> Int -> Char
            -- 0-origin indexing into the string
mapPS       :: (Char -> Char) -> PackedString -> PackedString
filterPS    :: (Char -> Bool) -> PackedString -> PackedString
foldlPS     :: (a -> Char -> a) -> a -> PackedString -> a
foldrPS     :: (Char -> a -> a) -> a -> PackedString -> a
takePS      :: Int -> PackedString -> PackedString
dropPS      :: Int -> PackedString -> PackedString
splitAtPS   :: Int -> PackedString -> (PackedString, PackedString)
takeWhilePS :: (Char -> Bool) -> PackedString -> PackedString
dropWhilePS :: (Char -> Bool) -> PackedString -> PackedString
spanPS      :: (Char -> Bool) -> PackedString -> (PackedString, PackedString)
breakPS     :: (Char -> Bool) -> PackedString -> (PackedString, PackedString)
linesPS     :: PackedString -> [PackedString]
wordsPS     :: PackedString -> [PackedString]
reversePS   :: PackedString -> PackedString
concatPS    :: [PackedString] -> PackedString
elemPS      :: Char -> PackedString -> Bool
  -- Perl-style split&join
splitPS     :: Char -> PackedString -> [PackedString]
splitWithPS :: (Char -> Bool) -> PackedString -> [PackedString]
joinPS      :: PackedString -> [PackedString] -> PackedString

substrPS   :: PackedString -> Int -> Int -> PackedString
           -- pluck out a piece of a PackedString
           -- start and end chars you want; both 0-origin-specified
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