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paulp/gist:244846ffa026ac7bfed3bf57ea0398db

Created August 23, 2018 06:42
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gistfile1.txt
instance Monad f => Monad (OptionalT f) where
f =<< x = OptionalT $ runOptionalT x >>= \case
Empty -> return Empty
Full a -> runOptionalT $ f a
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