From bf2194c1df0354bf7a4a8792962f8d56a8b6b5df Mon Sep 17 00:00:00 2001
From: satorg <satorg@gmail.com>
Date: Wed, 1 Jun 2022 20:06:12 -0700
Subject: [PATCH] make NonEmptyChainImpl

---
 core/src/main/scala/cats/data/NonEmptyChain.scala | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/core/src/main/scala/cats/data/NonEmptyChain.scala b/core/src/main/scala/cats/data/NonEmptyChain.scala
index 86a7db7befa..e6429ee9591 100644
--- a/core/src/main/scala/cats/data/NonEmptyChain.scala
+++ b/core/src/main/scala/cats/data/NonEmptyChain.scala
@@ -22,14 +22,12 @@
 package cats
 package data
 
-import NonEmptyChainImpl.create
-
 import cats.instances.StaticMethods
 import cats.kernel._
 
 import scala.collection.immutable.SortedMap
 
-private[data] object NonEmptyChainImpl extends NonEmptyChainInstances with ScalaVersionSpecificNonEmptyChainImpl {
+private[data] object NonEmptyChainImpl extends NonEmptyChainImpl {
   // The following 3 types are components of a technique to
   // create a no-boxing newtype. It's copied from the
   // newtypes lib by @alexknvl
@@ -44,6 +42,12 @@ private[data] object NonEmptyChainImpl extends NonEmptyChainInstances with Scala
 
   private[data] def unwrap[A](s: Type[A]): Chain[A] =
     s.asInstanceOf[Chain[A]]
+}
+
+// This class has to be public to expose public methods to Mima.
+@deprecated("for internal purposes only - do not use", "2.8.0")
+sealed abstract class NonEmptyChainImpl extends NonEmptyChainInstances with ScalaVersionSpecificNonEmptyChainImpl {
+  self: NonEmptyChainImpl.type =>
 
   def fromChain[A](as: Chain[A]): Option[NonEmptyChain[A]] =
     if (as.nonEmpty) Option(create(as)) else None
@@ -83,10 +87,12 @@ class NonEmptyChainOps[A](private val value: NonEmptyChain[A])
     extends AnyVal
     with NonEmptyCollection[A, Chain, NonEmptyChain] {
 
+  import NonEmptyChainImpl.{create, unwrap}
+
   /**
    * Converts this chain to a `Chain`
    */
-  final def toChain: Chain[A] = NonEmptyChainImpl.unwrap(value)
+  final def toChain: Chain[A] = unwrap(value)
 
   /**
    * Returns a new NonEmptyChain consisting of `a` followed by this. O(1) runtime.