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Relax constraints on Semigroup and Monoid instances #564

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Relax constraints on Semigroup and Monoid instances #564

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4 changes: 2 additions & 2 deletions Data/HashMap/Internal.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -311,7 +311,7 @@ instance Bifoldable HashMap where
--
-- >>> fromList [(1,'a'),(2,'b')] <> fromList [(2,'c'),(3,'d')]
-- fromList [(1,'a'),(2,'b'),(3,'d')]
instance Hashable k => Semigroup (HashMap k v) where
instance Eq k => Semigroup (HashMap k v) where
(<>) = union
{-# INLINE (<>) #-}
stimes = stimesIdempotentMonoid
Expand All @@ -327,7 +327,7 @@ instance Hashable k => Semigroup (HashMap k v) where
--
-- >>> mappend (fromList [(1,'a'),(2,'b')]) (fromList [(2,'c'),(3,'d')])
-- fromList [(1,'a'),(2,'b'),(3,'d')]
instance Hashable k => Monoid (HashMap k v) where
instance Eq k => Monoid (HashMap k v) where
mempty = empty
{-# INLINE mempty #-}
mappend = (<>)
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4 changes: 2 additions & 2 deletions Data/HashSet/Internal.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -187,7 +187,7 @@ instance Foldable.Foldable HashSet where
--
-- >>> fromList [1,2] <> fromList [2,3]
-- fromList [1,2,3]
instance Hashable a => Semigroup (HashSet a) where
instance Eq a => Semigroup (HashSet a) where
(<>) = union
{-# INLINE (<>) #-}
stimes = stimesIdempotentMonoid
Expand All @@ -206,7 +206,7 @@ instance Hashable a => Semigroup (HashSet a) where
--
-- >>> mappend (fromList [1,2]) (fromList [2,3])
-- fromList [1,2,3]
instance Hashable a => Monoid (HashSet a) where
instance Eq a => Monoid (HashSet a) where
mempty = empty
{-# INLINE mempty #-}
mappend = (<>)
Expand Down