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-rw-r--r--src/Data/Array/Nested/Internal.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/Data/Array/Nested/Internal.hs b/src/Data/Array/Nested/Internal.hs
index efb9dc6..1999bb6 100644
--- a/src/Data/Array/Nested/Internal.hs
+++ b/src/Data/Array/Nested/Internal.hs
@@ -857,7 +857,7 @@ type role ListR nominal representational
type ListR :: INat -> Type -> Type
data ListR n i where
ZR :: ListR Z i
- (:::) :: forall n {i}. i -> ListR n i -> ListR (S n) i
+ (:::) :: forall n {i}. !i -> !(ListR n i) -> ListR (S n) i
deriving instance Show i => Show (ListR n i)
deriving instance Eq i => Eq (ListR n i)
deriving instance Ord i => Ord (ListR n i)