Run IO[List[Int]] in Parallel using Ammonite

x.scala

@ import $ivy.`org.typelevel::cats-effect:0.10.1` 

@ import cats._, cats.data._, cats.implicits._, cats.effect._

@ def lift(i: Int): IO[Int] = Timer[IO].sleep(1.second) >> IO { 
  
     println(Thread.currentThread.getName + "At time = " + java.time.Instant.now)
     i
  } 

@ (0 to 10).toList.map(i => Concurrent[IO].start(lift(i))) 
res41: List[IO[Fiber[IO, Int]]] = List(
  Async(cats.effect.internals.IOStart$$$Lambda$2681/256186736@2faeea2),
  Async(cats.effect.internals.IOStart$$$Lambda$2681/256186736@3e8c8be5),
  Async(cats.effect.internals.IOStart$$$Lambda$2681/256186736@108a2dcd),
  Async(cats.effect.internals.IOStart$$$Lambda$2681/256186736@d21918f),
  Async(cats.effect.internals.IOStart$$$Lambda$2681/256186736@58fbe177),
  Async(cats.effect.internals.IOStart$$$Lambda$2681/256186736@2729a2e),
  Async(cats.effect.internals.IOStart$$$Lambda$2681/256186736@43d73be8),
  Async(cats.effect.internals.IOStart$$$Lambda$2681/256186736@427b77f4),
  Async(cats.effect.internals.IOStart$$$Lambda$2681/256186736@450cd695),
  Async(cats.effect.internals.IOStart$$$Lambda$2681/256186736@533987f0),
  Async(cats.effect.internals.IOStart$$$Lambda$2681/256186736@29cbfe04)
)

@ Traverse[List].sequence(res41) 
res42: IO[List[Fiber[IO, Int]]] = Map(
  Bind(Async(cats.effect.internals.IOStart$$$Lambda$2681/256186736@2faeea2), cats.FlatMap$$Lambda$2914/1434934951@60e127c1),
  scala.Function2$$Lambda$930/320860012@7d3aaf87,
  0
)

@ res42.map(_.map(_.join)) 
res43: IO[List[IO[Int]]] = Map(
  Bind(Async(cats.effect.internals.IOStart$$$Lambda$2681/256186736@2faeea2), cats.FlatMap$$Lambda$2914/1434934951@60e127c1),
  scala.Function1$$Lambda$36/152134087@685766df,
  1
)

@ res43.map(_.sequence).flatten.unsafeRunSync 
scala-execution-context-global-2441At time = 2018-05-28T16:15:58.495Z
scala-execution-context-global-2439At time = 2018-05-28T16:15:58.495Z
scala-execution-context-global-2439At time = 2018-05-28T16:15:58.495Z
scala-execution-context-global-2657At time = 2018-05-28T16:15:58.495Z
scala-execution-context-global-2439At time = 2018-05-28T16:15:58.495Z
scala-execution-context-global-2657At time = 2018-05-28T16:15:58.495Z
scala-execution-context-global-2439At time = 2018-05-28T16:15:58.495Z
scala-execution-context-global-2660At time = 2018-05-28T16:15:58.495Z
scala-execution-context-global-2657At time = 2018-05-28T16:15:58.495Z
scala-execution-context-global-2438At time = 2018-05-28T16:15:58.496Z
scala-execution-context-global-2441At time = 2018-05-28T16:15:58.496Z
res44: List[Int] = List(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)