2 files changed, 13 insertions, 0 deletions
diff --git a/src/Data/Array/Mixed.hs b/src/Data/Array/Mixed.hs
index 30dfd92..f597bbf 100644
--- a/src/Data/Array/Mixed.hs
+++ b/src/Data/Array/Mixed.hs
@@ -70,6 +70,7 @@ type family Rank sh where
 
 type XArray :: [Maybe Nat] -> Type -> Type
 data XArray sh a = XArray (U.Array (GNat (Rank sh)) a)
+  deriving (Show)
 
 zeroIdx :: StaticShapeX sh -> IxX sh
 zeroIdx SZX = IZX
diff --git a/src/Data/Array/Nested/Internal.hs b/src/Data/Array/Nested/Internal.hs
index 892f4d8..7d4621a 100644
--- a/src/Data/Array/Nested/Internal.hs
+++ b/src/Data/Array/Nested/Internal.hs
@@ -1,6 +1,7 @@
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DerivingVia #-}
 {-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE InstanceSigs #-}
 {-# LANGUAGE PolyKinds #-}
@@ -12,6 +13,7 @@
 {-# LANGUAGE TypeApplications #-}
 {-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE TypeOperators #-}
+{-# LANGUAGE UndecidableInstances #-}
 
 {-|
 TODO:
@@ -91,16 +93,22 @@ type Mixed :: [Maybe Nat] -> Type -> Type
 data family Mixed sh a
 
 newtype instance Mixed sh (Primitive a) = M_Primitive (XArray sh a)
+  deriving (Show)
 
 newtype instance Mixed sh Int = M_Int (XArray sh Int)
+  deriving (Show)
 newtype instance Mixed sh Double = M_Double (XArray sh Double)
+  deriving (Show)
 newtype instance Mixed sh () = M_Nil (XArray sh ())  -- no content, orthotope optimises this (via Vector)
+  deriving (Show)
 -- etc.
 
 data instance Mixed sh (a, b) = M_Tup2 (Mixed sh a) (Mixed sh b)
+deriving instance (Show (Mixed sh a), Show (Mixed sh b)) => Show (Mixed sh (a, b))
 -- etc.
 
 newtype instance Mixed sh1 (Mixed sh2 a) = M_Nest (Mixed (sh1 ++ sh2) a)
+deriving instance Show (Mixed (sh1 ++ sh2) a) => Show (Mixed sh1 (Mixed sh2 a))
 
 
 -- | Internal helper data family mirrorring 'Mixed' that consists of mutable
@@ -322,6 +330,7 @@ mgenerate sh f
 -- 'Ranked' is a newtype around a 'Mixed' of 'Nothing's.
 type Ranked :: Nat -> Type -> Type
 newtype Ranked n a = Ranked (Mixed (Replicate n Nothing) a)
+deriving instance Show (Mixed (Replicate n Nothing) a) => Show (Ranked n a)
 
 -- | A shape-typed array: the full shape of the array (the sizes of its
 -- dimensions) is represented on the type level as a list of 'Nat's.
@@ -332,10 +341,13 @@ newtype Ranked n a = Ranked (Mixed (Replicate n Nothing) a)
 -- 'Shaped' is a newtype around a 'Mixed' of 'Just's.
 type Shaped :: [Nat] -> Type -> Type
 newtype Shaped sh a = Shaped (Mixed (MapJust sh) a)
+deriving instance Show (Mixed (MapJust sh) a) => Show (Shaped sh a)
 
 -- just unwrap the newtype and defer to the general instance for nested arrays
 newtype instance Mixed sh (Ranked n   a) = M_Ranked (Mixed sh (Mixed (Replicate n Nothing) a))
+deriving instance Show (Mixed sh (Mixed (Replicate n Nothing) a)) => Show (Mixed sh (Ranked n a))
 newtype instance Mixed sh (Shaped sh' a) = M_Shaped (Mixed sh (Mixed (MapJust sh'        ) a))
+deriving instance Show (Mixed sh (Mixed (MapJust sh'        ) a)) => Show (Mixed sh (Shaped sh' a))
 
 newtype instance MixedVecs s sh (Ranked n   a) = MV_Ranked (MixedVecs s sh (Mixed (Replicate n Nothing) a))
 newtype instance MixedVecs s sh (Shaped sh' a) = MV_Shaped (MixedVecs s sh (Mixed (MapJust sh'        ) a))