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Optimize liftOutcome in KleisliGenSpawn to avoid allocation #4598

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Optimize liftOutcome in KleisliGenSpawn to avoid allocation #4598

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11 changes: 5 additions & 6 deletions kernel/shared/src/main/scala/cats/effect/kernel/GenSpawn.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@

package cats.effect.kernel

import cats.{~>, Applicative, Monoid, Semigroup}
import cats.{Applicative, Monoid, Semigroup}
import cats.data.{EitherT, Ior, IorT, Kleisli, OptionT, WriterT}
import cats.effect.kernel.syntax.monadCancel._
import cats.syntax.all._
Expand Down Expand Up @@ -851,12 +851,11 @@ object GenSpawn {
}

private def liftOutcome[A](oc: Outcome[F, E, A]): Outcome[Kleisli[F, R, *], E, A] = {

val nat: F ~> Kleisli[F, R, *] = new ~>[F, Kleisli[F, R, *]] {
def apply[B](fa: F[B]) = Kleisli.liftF(fa)
oc match {
case Outcome.Canceled() => Outcome.Canceled()
case Outcome.Errored(e) => Outcome.Errored(e)
case Outcome.Succeeded(fa) => Outcome.Succeeded(Kleisli.liftF(fa))
}

oc.mapK(nat)
}

private def liftFiber[A](fib: Fiber[F, E, A]): Fiber[Kleisli[F, R, *], E, A] =
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