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Add missing role annotation on open unions #42

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Add missing role annotation on open unions #42

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3 changes: 3 additions & 0 deletions src/Data/OpenUnion/Internal.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE UndecidableInstances #-}
{-# LANGUAGE RoleAnnotations #-}

-- |
-- Module: Data.OpenUnion.Internal
Expand Down Expand Up @@ -40,6 +41,8 @@ import Unsafe.Coerce (unsafeCoerce)
data Union (r :: [Type -> Type]) a where
Union :: {-# UNPACK #-} !Word -> t a -> Union r a

type role Union nominal nominal

-- | Takes a request of type @t :: * -> *@, and injects it into the 'Union'.
--
-- Summand is assigning a specified 'Word' value, which is a position in the
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