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-rw-r--r--compiler/cmm/Hoopl/Label.hs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/cmm/Hoopl/Label.hs b/compiler/cmm/Hoopl/Label.hs
index 8096fab073..6eae115779 100644
--- a/compiler/cmm/Hoopl/Label.hs
+++ b/compiler/cmm/Hoopl/Label.hs
@@ -87,6 +87,7 @@ instance IsMap LabelMap where
mapInsert (Label k) v (LM m) = LM (mapInsert k v m)
mapInsertWith f (Label k) v (LM m) = LM (mapInsertWith f k v m)
mapDelete (Label k) (LM m) = LM (mapDelete k m)
+ mapAlter f (Label k) (LM m) = LM (mapAlter f k m)
mapUnion (LM x) (LM y) = LM (mapUnion x y)
mapUnionWithKey f (LM x) (LM y) = LM (mapUnionWithKey (f . mkHooplLabel) x y)