3 files changed, 10 insertions, 14 deletions
diff --git a/src/Data/Array/Mixed/Permutation.hs b/src/Data/Array/Mixed/Permutation.hs
index ca99b02..331d5e0 100644
--- a/src/Data/Array/Mixed/Permutation.hs
+++ b/src/Data/Array/Mixed/Permutation.hs
@@ -45,9 +45,9 @@ infixr 5 `PCons`
 deriving instance Show (Perm list)
 deriving instance Eq (Perm list)
 
-permLengthSNat :: Perm list -> SNat (Rank list)
-permLengthSNat PNil = SNat
-permLengthSNat (_ `PCons` l) | SNat <- permLengthSNat l = SNat
+permRank :: Perm list -> SNat (Rank list)
+permRank PNil = SNat
+permRank (_ `PCons` l) | SNat <- permRank l = SNat
 
 permFromList :: [Int] -> (forall list. Perm list -> r) -> r
 permFromList [] k = k PNil
@@ -67,7 +67,7 @@ permToList' = map fromIntegral . permToList
 -- then @Nothing@ is returned.
 permCheckPermutation :: forall r list. Perm list -> (IsPermutation list => r) -> Maybe r
 permCheckPermutation = \p k ->
-  let n = permLengthSNat p
+  let n = permRank p
   in case (provePerm1 (Proxy @list) n p, provePerm2 (SNat @0) n p) of
        (Just Refl, Just Refl) -> Just k
        _ -> Nothing
diff --git a/src/Data/Array/Mixed/Shape.hs b/src/Data/Array/Mixed/Shape.hs
index e46105d..95cd4ef 100644
--- a/src/Data/Array/Mixed/Shape.hs
+++ b/src/Data/Array/Mixed/Shape.hs
@@ -81,9 +81,9 @@ listxFold f (x ::% xs) = f x <> listxFold f xs
 listxLength :: ListX sh f -> Int
 listxLength = getSum . listxFold (\_ -> Sum 1)
 
-listxLengthSNat :: ListX sh f -> SNat (Rank sh)
-listxLengthSNat ZX = SNat
-listxLengthSNat (_ ::% l) | SNat <- listxLengthSNat l = SNat
+listxRank :: ListX sh f -> SNat (Rank sh)
+listxRank ZX = SNat
+listxRank (_ ::% l) | SNat <- listxRank l = SNat
 
 listxShow :: forall sh f. (forall n. f n -> ShowS) -> ListX sh f -> ShowS
 listxShow f l = showString "[" . go "" l . showString "]"
@@ -265,8 +265,8 @@ instance NFData i => NFData (ShX sh i) where
 shxLength :: ShX sh i -> Int
 shxLength (ShX l) = listxLength l
 
-shxLengthSNat :: ShX sh f -> SNat (Rank sh)
-shxLengthSNat (ShX list) = listxLengthSNat list
+shxRank :: ShX sh f -> SNat (Rank sh)
+shxRank (ShX list) = listxRank list
 
 -- | This is more than @geq@: it also checks that the integers (the unknown
 -- dimensions) are the same.
@@ -344,10 +344,6 @@ shxEnum = \sh -> go sh id []
     go ZSX f = (f ZIX :)
     go (n :$% sh) f = foldr (.) id [go sh (f . (i :.%)) | i <- [0 .. fromSMayNat' n - 1]]
 
-shxRank :: ShX sh f -> SNat (Rank sh)
-shxRank ZSX = SNat
-shxRank (_ :$% sh) | SNat <- shxRank sh = SNat
-
 
 -- * Static mixed shapes
 
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 $