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-rw-r--r--src/Data/Array/Nested/Shaped.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/Data/Array/Nested/Shaped.hs b/src/Data/Array/Nested/Shaped.hs
index aaba367..0275aad 100644
--- a/src/Data/Array/Nested/Shaped.hs
+++ b/src/Data/Array/Nested/Shaped.hs
@@ -173,7 +173,7 @@ sunNest sarr@(Shaped (M_Shaped (M_Nest _ arr)))
| Refl <- lemMapJustApp (sshape sarr) (Proxy @sh')
= Shaped arr
-szip :: Shaped sh a -> Shaped sh b -> Shaped sh (a, b)
+szip :: (Elt a, Elt b) => Shaped sh a -> Shaped sh b -> Shaped sh (a, b)
szip = coerce mzip
sunzip :: Shaped sh (a, b) -> (Shaped sh a, Shaped sh b)