From f10f364721e6bcbb64e9adb86feb859ed4006f17 Mon Sep 17 00:00:00 2001
From: Yann Simon <yann.simon@commercetools.com>
Date: Thu, 4 Jul 2024 17:26:09 +0200
Subject: [PATCH] Issue #4631: Make Later covariant

Same as https://github.com/typelevel/cats/pull/937
---
 core/src/main/scala/cats/Eval.scala | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/core/src/main/scala/cats/Eval.scala b/core/src/main/scala/cats/Eval.scala
index 7834248b3c..ceb6b87fad 100644
--- a/core/src/main/scala/cats/Eval.scala
+++ b/core/src/main/scala/cats/Eval.scala
@@ -157,7 +157,7 @@ final case class Now[A](value: A) extends Eval.Leaf[A] {
  * by the closure) will not be retained, and will be available for
  * garbage collection.
  */
-final class Later[A](f: () => A) extends Eval.Leaf[A] {
+final class Later[+A](f: () => A) extends Eval.Leaf[A] {
   private[this] var thunk: () => A = f
 
   // The idea here is that `f` may have captured very large
@@ -206,7 +206,7 @@ object Eval extends EvalInstances {
    * so calling .value does not trigger
    * any flatMaps or defers
    */
-  sealed abstract class Leaf[A] extends Eval[A]
+  sealed abstract class Leaf[+A] extends Eval[A]
 
   /**
    * Construct an eager Eval[A] value (i.e. Now[A]).