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April 28, 2015 09:12
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Free Monad structure in Scala
From http://underscore.io/blog/posts/2015/04/23/deriving-the-free-monad.html
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| sealed trait Free[F[_], A] | |
| final case class Return[F[_], A](a: A) extends Free[F, A] | |
| final case class Suspend[F[_], A](s: F[Free[F, A]]) extends Free[F, A] |
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