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-rw-r--r--src/Data/Array/Mixed/XArray.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/Data/Array/Mixed/XArray.hs b/src/Data/Array/Mixed/XArray.hs
index 20f5c7a..08295cd 100644
--- a/src/Data/Array/Mixed/XArray.hs
+++ b/src/Data/Array/Mixed/XArray.hs
@@ -258,7 +258,7 @@ sumInner ssh ssh' arr
go :: XArray (sh ++ '[Flatten sh']) a -> XArray sh a
go (XArray arr')
| Refl <- lemRankApp ssh ssh'F
- , let sn = listxLengthSNat (let StaticShX l = ssh in l)
+ , let sn = listxRank (let StaticShX l = ssh in l)
= XArray (numEltSum1Inner sn arr')
in go $