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-rw-r--r--compiler/cmm/ZipDataflow.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/cmm/ZipDataflow.hs b/compiler/cmm/ZipDataflow.hs
index 60bcda7400..f09368dfd7 100644
--- a/compiler/cmm/ZipDataflow.hs
+++ b/compiler/cmm/ZipDataflow.hs
@@ -233,7 +233,7 @@ lgraphToGraph (LGraph eid blocks) =
class (Outputable m, Outputable l, LastNode l, Outputable (LGraph m l)) => DebugNodes m l
-fwd_pure_anal :: (DebugNodes m l, Outputable a)
+fwd_pure_anal :: (DebugNodes m l, LastNode l, Outputable a)
=> PassName
-> BlockEnv a
-> ForwardTransfers m l a