fix compile error

kernel-laws/shared/src/test/scala-2.13+/cats/kernel/laws/scalaVersionSpecific.scala

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2015 Typelevel
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+package cats.kernel.laws
+
+private[cats] object scalaVersionSpecific

kernel/src/main/scala-2.13+/cats/kernel/compat/scalaVersionSpecific.scala

@@ -38,6 +38,6 @@ private[cats] object scalaVersionSpecific {
   }
 
   implicit class setExtension[A](private val s: java.util.Set[A]) extends AnyVal {
-    def asScala: Iterable[A] = CollectionConverters.asScala(x)
+    def asScala: Iterable[A] = CollectionConverters.asScala(s)
   }
 }