X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fcmm%2FZipCfg.hs;h=67a4ecdde60e9cff77c33f6f7c76f1be6d86e864;hb=90b9566607ef837329434657c8fabc4bdffdf1af;hp=1b9b5c309d169c248117d499d368eee1479a5dd5;hpb=5a7a311051c2a525c9692a7b2eb47a70cfc7c9fb;p=ghc-hetmet.git

diff --git a/compiler/cmm/ZipCfg.hs b/compiler/cmm/ZipCfg.hs
index 1b9b5c3..67a4ecd 100644
--- a/compiler/cmm/ZipCfg.hs
+++ b/compiler/cmm/ZipCfg.hs
@@ -691,10 +691,16 @@ instance (Outputable m, Outputable l) => Outputable (ZTail m l) where
 instance (Outputable m, Outputable l, LastNode l) => Outputable (LGraph m l) where
     ppr = pprLgraph
 
+instance (Outputable l) => Outputable (ZLast l) where
+    ppr = pprLast
+
 pprTail :: (Outputable m, Outputable l) => ZTail m l -> SDoc 
 pprTail (ZTail m t) = ppr m $$ ppr t
-pprTail (ZLast LastExit) = text "<exit>"
-pprTail (ZLast (LastOther l)) = ppr l
+pprTail (ZLast l) = ppr l
+
+pprLast :: (Outputable l) => ZLast l -> SDoc
+pprLast LastExit = text "<exit>"
+pprLast (LastOther l) = ppr l
 
 pprLgraph :: (Outputable m, Outputable l, LastNode l) => LGraph m l -> SDoc
 pprLgraph g = text "{" $$ nest 2 (vcat $ map pprBlock blocks) $$ text "}"
@@ -707,5 +713,3 @@ pprGraph (Graph tail blockenv) =
     where pprBlock (Block id tail) = ppr id <> colon $$ ppr tail
           blocks = postorder_dfs_from blockenv tail
 
-_unused :: FS.FastString
-_unused = undefined