windymelt/gist:8886521

## gistfile1.scala
import scalaz.std.stream._
import scalaz.syntax.id._

unfold(0)(failable(_).map(_.squared)).force // => Stream(1, 2, 3, 4, 5, ..., 99, 100)
unfold(0)(failable(_).map(n => (s"n=${n}", n))).force // => Stream("n=1", "n=2", ... "n=100")
	import scalaz.std.stream._
	import scalaz.syntax.id._

	unfold(0)(failable(_).map(_.squared)).force // => Stream(1, 2, 3, 4, 5, ..., 99, 100)
	unfold(0)(failable(_).map(n => (s"n=${n}", n))).force // => Stream("n=1", "n=2", ... "n=100")