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Add roles declarations to allow safe coercions #194

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Dec 4, 2020
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Add roles declarations to allow safe coercions #194

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4 changes: 4 additions & 0 deletions src/Effect/Aff.purs
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Original file line number Diff line number Diff line change
Expand Up @@ -63,6 +63,8 @@ import Unsafe.Coerce (unsafeCoerce)
-- | `makeAff` or `liftEffect`.
foreign import data Aff ∷ Type → Type

type role Aff representational

instance functorAff ∷ Functor Aff where
map = _map

Expand Down Expand Up @@ -117,6 +119,8 @@ instance lazyAff ∷ Lazy (Aff a) where
-- | `ParAff` and back using the `Parallel` class.
foreign import data ParAff ∷ Type → Type

type role ParAff representational

instance functorParAff ∷ Functor ParAff where
map = _parAffMap

Expand Down