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Supply a default implementation of sequenceL.

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Rob Rix 2016-03-10 12:54:17 -05:00
parent 05d5d69cfc
commit 2cd47afafd
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src/Data/Align.hs
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@ -19,6 +19,7 @@ instance Align [] where
class Crosswalk t where
crosswalk :: Align f => (a -> f b) -> t a -> f (t b)
sequenceL :: Align f => t (f a) -> f (t a)
sequenceL = crosswalk id
instance Crosswalk Identity where
sequenceL = fmap Identity . runIdentity