X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Futils%2FUtil.lhs;h=495df8257fe0af8d175c21687549f52e272d7e81;hb=a65481fce16930ff0cd343c9278d9b8961bee94f;hp=1d7f7a4ee211d07d366387753d3dab76ef84e383;hpb=262c142b90c94ca1aa577c950a6ceae1f255e2d6;p=ghc-hetmet.git

diff --git a/compiler/utils/Util.lhs b/compiler/utils/Util.lhs
index 1d7f7a4..495df82 100644
--- a/compiler/utils/Util.lhs
+++ b/compiler/utils/Util.lhs
@@ -42,7 +42,7 @@ module Util (
 	removeSpaces,
 
 	-- strictness
-	foldl', seqList,
+	seqList,
 
 	-- pairs
 	unzipWith,
@@ -79,9 +79,12 @@ module Util (
 
 #include "HsVersions.h"
 
-import Panic		( panic, trace )
 import FastTypes
 
+#ifdef DEBUG
+import Panic		( panic, trace )
+#endif
+
 import Control.Exception ( Exception(..), finally, catchDyn, throw )
 import qualified Control.Exception as Exception
 import Data.Dynamic	( Typeable )
@@ -89,10 +92,11 @@ import Data.IORef	( IORef, newIORef )
 import System.IO.Unsafe	( unsafePerformIO )
 import Data.IORef	( readIORef, writeIORef )
 
-import qualified Data.List as List ( elem, notElem )
-
+import qualified Data.List as List ( elem )
 #ifndef DEBUG
 import Data.List		( zipWith4 )
+#else
+import qualified Data.List as List ( notElem )
 #endif
 
 import Control.Monad	( when )
@@ -487,16 +491,6 @@ transitiveClosure succ eq xs
 %*									*
 %************************************************************************
 
-A strict version of foldl.
-
-\begin{code}
-foldl'        :: (a -> b -> a) -> a -> [b] -> a
-foldl' f z xs = lgo z xs
-	     where
-		lgo z []     =  z
-		lgo z (x:xs) = (lgo $! (f z x)) xs
-\end{code}
-
 A combination of foldl with zip.  It works with equal length lists.
 
 \begin{code}
@@ -596,6 +590,8 @@ cmpList cmp (a:as) (b:bs)
 \end{code}
 
 \begin{code}
+-- This (with a more general type) is Data.List.stripPrefix from GHC 6.8.
+-- This definition can be removed once we require at least 6.8 to build.
 maybePrefixMatch :: String -> String -> Maybe String
 maybePrefixMatch []    rest = Just rest
 maybePrefixMatch (_:_) []   = Nothing