1 files changed, 10 insertions, 6 deletions
diff --git a/test/Util.hs b/test/Util.hs
index 8a5ba72..6514fbf 100644
--- a/test/Util.hs
+++ b/test/Util.hs
@@ -36,16 +36,20 @@ orSumOuter1 (sn@SNat :: SNat n) =
   let n = fromSNat' sn
   in OR.rerank @n @1 @0 (OR.scalar . OR.sumA) . OR.transpose ([1 .. n] ++ [0])
 
-class AlmostEq f where
-  type AlmostEqConstr f :: Type -> Constraint
+class AlmostEq t where
+  type EltOf t :: Type
   -- | absolute tolerance, lhs, rhs
-  almostEq :: (AlmostEqConstr f a, Ord a, Show a, Fractional a, MonadTest m)
-           => a -> f a -> f a -> m ()
+  almostEq :: MonadTest m => EltOf t -> t -> t -> m ()
 
-instance AlmostEq (OR.Array n) where
-  type AlmostEqConstr (OR.Array n) = OR.Unbox
+instance (OR.Unbox a, Ord a, Show a, Fractional a) => AlmostEq (OR.Array n a) where
+  type EltOf (OR.Array n a) = a
   almostEq atol lhs rhs
     | OR.allA (< atol) (OR.zipWithA (\a b -> abs (a - b)) rhs lhs) =
         success
     | otherwise =
         failDiff lhs rhs
+
+instance AlmostEq Double where
+  type EltOf Double = Double
+  almostEq atol lhs rhs | abs (lhs - rhs) < atol = success
+                        | otherwise = failDiff lhs rhs