applicative/h11.hs


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-- http://stackoverflow.com/questions/23316255/lax-monoidal-functors-with-a-different-monoidal-structure
pure a = fmap (const a) unit
unit = pure ()

ff <*> fa = fmap (\(f,a) -> f a) $ ff ** fa
fa ** fb = pure (,) <*> fa <*> fb