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Add type role annotation to Opt #27

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Add type role annotation to Opt #27

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9 changes: 5 additions & 4 deletions src/Data/Undefined/NoProblem.purs
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Original file line number Diff line number Diff line change
Expand Up @@ -29,17 +29,18 @@ derive newtype instance Show a => Show (Req a)
-- | to omit such field when passing the parameter, but still allowing the
-- | receiving function to work with the field.
foreign import data Opt ∷ Type → Type
type role Opt representational

instance eqOpt ∷ Eq a ⇒ Eq (Opt a) where
instance Eq a ⇒ Eq (Opt a) where
eq u1 u2 = toMaybe u1 == toMaybe u2

instance eq1Opt ∷ Eq a ⇒ Eq1 Opt where
instance Eq a ⇒ Eq1 Opt where
eq1 u1 u2 = eq1 (toMaybe u1) (toMaybe u2)

instance ordOpt ∷ Ord a ⇒ Ord (Opt a) where
instance Ord a ⇒ Ord (Opt a) where
compare u1 u2 = toMaybe u1 `compare` toMaybe u2

instance showOpt ∷ Show a ⇒ Show (Opt a) where
instance Show a ⇒ Show (Opt a) where
show = maybe "undefined" ("Opt " <> _) <<< map show <<< toMaybe

foreign import undefined ∷ ∀ a. Opt a
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