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Define Append canonically #503

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Dec 5, 2023
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3 changes: 1 addition & 2 deletions optics-core/src/Optics/Internal/Optic/TypeLevel.hs
Original file line number Diff line number Diff line change
Expand Up @@ -73,8 +73,7 @@ type family Curry (xs :: IxList) (y :: Type) :: Type where

-- | Append two type-level lists together.
type family Append (xs :: [k]) (ys :: [k]) :: [k] where
Append '[] ys = ys -- needed for (<%>) and (%>)
Append xs '[] = xs -- needed for (<%)
Append '[] ys = ys
Append (x ': xs) ys = x ': Append xs ys

-- | Class that is inhabited by all type-level lists @xs@, providing the ability
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