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-rw-r--r--src/ForwardAD/DualNumbers.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/ForwardAD/DualNumbers.hs b/src/ForwardAD/DualNumbers.hs
index 3e45ce7..a93b8e6 100644
--- a/src/ForwardAD/DualNumbers.hs
+++ b/src/ForwardAD/DualNumbers.hs
@@ -153,7 +153,7 @@ dfwdDN = \case
EBuild1 _ a b -> EBuild1 ext (dfwdDN a) (dfwdDN b)
EBuild _ n a b
| Refl <- dnPreservesTupIx n -> EBuild ext n (dfwdDN a) (dfwdDN b)
- EFold1Inner _ a b -> EFold1Inner ext (dfwdDN a) (dfwdDN b)
+ EFold1Inner _ a b c -> EFold1Inner ext (dfwdDN a) (dfwdDN b) (dfwdDN c)
ESum1Inner _ e ->
let STArr n (STScal t) = typeOf e
pairty = (STPair (STScal t) (STScal t))