4 files changed, 4 insertions, 7 deletions
diff --git a/compiler/cmm/CmmSpillReload.hs b/compiler/cmm/CmmSpillReload.hs
index 4067f89fb1..0c53309657 100644
--- a/compiler/cmm/CmmSpillReload.hs
+++ b/compiler/cmm/CmmSpillReload.hs
@@ -360,9 +360,6 @@ instance Outputable m => Outputable (ExtendWithSpills m) where
     ppr (Reload regs) = ppr_regs "Reload" regs
     ppr (NotSpillOrReload m) = ppr m
 
-instance Outputable (LGraph M Last) where
-    ppr = pprLgraph
-
 instance DebugNodes M Last
                                
 ppr_regs :: String -> RegSet -> SDoc
diff --git a/compiler/cmm/ZipCfg.hs b/compiler/cmm/ZipCfg.hs
index 85727a3bb4..1b9b5c309d 100644
--- a/compiler/cmm/ZipCfg.hs
+++ b/compiler/cmm/ZipCfg.hs
@@ -688,6 +688,9 @@ mkBlockSet = mkUniqSet
 instance (Outputable m, Outputable l) => Outputable (ZTail m l) where
     ppr = pprTail
 
+instance (Outputable m, Outputable l, LastNode l) => Outputable (LGraph m l) where
+    ppr = pprLgraph
+
 pprTail :: (Outputable m, Outputable l) => ZTail m l -> SDoc 
 pprTail (ZTail m t) = ppr m $$ ppr t
 pprTail (ZLast LastExit) = text "<exit>"
diff --git a/compiler/cmm/ZipCfgCmmRep.hs b/compiler/cmm/ZipCfgCmmRep.hs
index f0dc535ced..0667b7e091 100644
--- a/compiler/cmm/ZipCfgCmmRep.hs
+++ b/compiler/cmm/ZipCfgCmmRep.hs
@@ -197,9 +197,6 @@ instance Outputable Convention where
 
 instance DF.DebugNodes Middle Last
 
-instance Outputable CmmGraph where
-    ppr = pprLgraph
-
 debugPpr :: Bool
 debugPpr = debugIsOn
 
diff --git a/compiler/cmm/ZipDataflow0.hs b/compiler/cmm/ZipDataflow0.hs
index 3a3b0a8b75..7503d45104 100644
--- a/compiler/cmm/ZipDataflow0.hs
+++ b/compiler/cmm/ZipDataflow0.hs
@@ -244,7 +244,7 @@ fold_edge_facts_with_nodes_b :: LastNode l
 -- fixed point iteratively starting from somewhere other than bottom
 -- (as in the reachability analysis done for proc points).
 
-class (Outputable m, Outputable l, LastNode l, Outputable (LGraph m l)) => DebugNodes m l
+class (Outputable m, Outputable l, LastNode l) => DebugNodes m l
 
 refine_f_anal :: (DebugNodes m l, LastNode l, Outputable a) =>
         FAnalysis m l a -> LGraph m l -> DFA a () -> DFA a ()