From 873dc895ab9c059fa80c34d43e13228c5049ae9d Mon Sep 17 00:00:00 2001
From: Simon Marlow <simonmar@microsoft.com>
Date: Wed, 12 Sep 2007 11:09:09 +0000
Subject: [PATCH] foldl1' was added to Data.List in GHC 6.4.x

---
 compiler/nativeGen/RegSpillClean.hs |    3 ++-
 compiler/utils/Util.lhs             |   20 +++++++++++++++-----
 2 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/compiler/nativeGen/RegSpillClean.hs b/compiler/nativeGen/RegSpillClean.hs
index ea36a5e..47ded08 100644
--- a/compiler/nativeGen/RegSpillClean.hs
+++ b/compiler/nativeGen/RegSpillClean.hs
@@ -39,9 +39,10 @@ import UniqFM
 import Unique
 import State
 import Outputable
+import Util
 
 import Data.Maybe
-import Data.List
+import Data.List        ( nub )
 
 -- | Clean out unneeded spill/reloads from this top level thing.
 cleanSpills :: LiveCmmTop -> LiveCmmTop
diff --git a/compiler/utils/Util.lhs b/compiler/utils/Util.lhs
index 2d5e740..6cefad6 100644
--- a/compiler/utils/Util.lhs
+++ b/compiler/utils/Util.lhs
@@ -20,6 +20,7 @@ module Util (
 	mapFst, mapSnd,
 	mapAndUnzip, mapAndUnzip3,
 	nOfThem, filterOut, partitionWith, splitEithers,
+        foldl1',
 
 	lengthExceeds, lengthIs, lengthAtLeast, 
 	listLengthCmp, atLength, equalLength, compareLength,
@@ -88,8 +89,8 @@ module Util (
 
 import FastTypes
 
-#ifdef DEBUG
-import Panic		( panic, trace )
+#if defined(DEBUG) || __GLASGOW_HASKELL__ < 604
+import Panic
 #endif
 
 import Control.Exception ( Exception(..), finally, catchDyn, throw )
@@ -98,11 +99,10 @@ import Data.Dynamic	( Typeable )
 import Data.IORef	( IORef, newIORef )
 import System.IO.Unsafe	( unsafePerformIO )
 import Data.IORef	( readIORef, writeIORef )
+import Data.List        hiding (group)
 
 import qualified Data.List as List ( elem )
-#ifndef DEBUG
-import Data.List		( zipWith4 )
-#else
+#ifdef DEBUG
 import qualified Data.List as List ( notElem )
 #endif
 
@@ -363,6 +363,16 @@ isn'tIn msg x ys
 # endif /* DEBUG */
 \end{code}
 
+foldl1' was added in GHC 6.4
+
+\begin{code}
+#if __GLASGOW_HASKELL__ < 604
+foldl1'                  :: (a -> a -> a) -> [a] -> a
+foldl1' f (x:xs)         =  foldl' f x xs
+foldl1' _ []             =  panic "foldl1'"
+#endif
+\end{code}
+
 %************************************************************************
 %*									*
 \subsubsection[Utils-Carsten-mergesort]{A mergesort from Carsten}
-- 
1.7.10.4