Miguel Mitrofanov wrote:
It has nothing to do with State; it actually works in List monad. "return y" is just another way of writing "[y]".
Actually, it seems that in this case return is from the ((->) a) monad, i.e. return=const.
f x y = x >>= return y
= x >>= const y
= (concat . map) (const y) x
= concat (map (const y) x)
Zun.
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