Preparations for Scala 2.13

Author: MateuszKubuszok

.travis.yml

@@ -1,6 +1,7 @@
 language:       scala
 scala:
-              - 2.12.6
+              - 2.11.12
+              - 2.12.7
 jdk:
               - openjdk8
               - oraclejdk8

catnip.sbt

@@ -15,7 +15,6 @@ lazy val catnip = crossProject(JVMPlatform, JSPlatform).crossType(CrossType.Pure
   .setInitialImport("cats.implicits._")
   .configureModule
   .publish
-  .settings(addCompilerPlugin("org.scalamacros" % "paradise" % "2.1.1" cross sbt.CrossVersion.patch))
 
 lazy val catnipJVM = catnip.jvm
   .settings(Compile / unmanagedResourceDirectories += baseDirectory.value / "../src/main/resources")
@@ -32,8 +31,7 @@ lazy val catnipTests = crossProject(JVMPlatform, JSPlatform).crossType(CrossType
   .noPublish
   .settings(libraryDependencies ++= Seq(
     "org.specs2" %%% "specs2-core"       % Dependencies.specs2Version % "test",
-    "org.specs2" %%% "specs2-scalacheck" % Dependencies.specs2Version % "test",
-    compilerPlugin("org.scalamacros" % "paradise" % "2.1.1" cross sbt.CrossVersion.patch)
+    "org.specs2" %%% "specs2-scalacheck" % Dependencies.specs2Version % "test"
   ))
 
 lazy val catnipTestsJVM = catnipTests.jvm

lock.sbt

@@ -4,4 +4,4 @@
 dependencyOverrides ++= Seq(
 
 )
-// LIBRARY_DEPENDENCIES_HASH 0c1ecb84eefded81e31012edb83a33973e7edae4
+// LIBRARY_DEPENDENCIES_HASH fdc28634c6c339ea10ce9da391ecaee94ec774d2

modules/catnip-tests/.js/lock.sbt

@@ -20,4 +20,4 @@ dependencyOverrides ++= Seq(
   "org.typelevel" % "machinist_sjs0.6_2.12" % "0.6.5",
   "org.typelevel" % "macro-compat_2.12" % "1.1.1"
 )
-// LIBRARY_DEPENDENCIES_HASH 53a6369e0770c15ad470d90546a57e0825f8e5a2
+// LIBRARY_DEPENDENCIES_HASH a920cfdde255319e948d05199b843902b066cec3

modules/catnip-tests/.jvm/lock.sbt

@@ -13,4 +13,4 @@ dependencyOverrides ++= Seq(
   "org.typelevel" % "machinist_2.12" % "0.6.5",
   "org.typelevel" % "macro-compat_2.12" % "1.1.1"
 )
-// LIBRARY_DEPENDENCIES_HASH c17086026af918499dae1c57e5536983dced8f39
+// LIBRARY_DEPENDENCIES_HASH 05d734ce988c78042c9d3924eee3e08f8404af49

modules/catnip-tests/src/test/scala/io/scalaland/catnip/SemiSpec.scala

@@ -151,9 +151,11 @@ class SemiSpec extends Specification {
       result1 must not(beEqualTo(result2))
     }
 
+    @Semi(cats.Functor) final case class TestFunctor[A](a: A, b: A)
     "generate for cats.Functor" in {
       // given
-      @Semi(cats.Functor) final case class TestFunctor[A](a: A, b: A)
+      // test class moved outside as a workaround for error in 2.11:
+      //   can't existentially abstract over parameterized type TestFunctor[String]
 
       // when
       val result1 = TestFunctor("1", "3").map(_.toInt)
@@ -181,9 +183,11 @@ class SemiSpec extends Specification {
       result2 must beEqualTo(2)
     }
 
+    @Semi(cats.Traverse) final case class TestTraverse[A](a: A)
     "generate for cats.Traverse" in {
       // given
-      @Semi(cats.Traverse) final case class TestTraverse[A](a: A)
+      // test class moved outside as a workaround for error in 2.11:
+      //   can't existentially abstract over parameterized type TestTraverse[Int]
 
       // when
       val result1 = TestTraverse(Option("1")).sequence
@@ -264,9 +268,11 @@ class SemiSpec extends Specification {
       result2 must beEqualTo(TestSemi("ba"))
     }
 
+    @Semi(cats.SemigroupK, cats.Eq) final case class TestSemiK[A](a: List[A])
     "generate for cats.SemigroupK" in {
       // given
-      @Semi(cats.SemigroupK, cats.Eq) final case class TestSemiK[A](a: List[A])
+      // test class moved outside as a workaround for error in 2.11:
+      //   can't existentially abstract over parameterized type TestSemiK[String]
 
       // when
       implicit val a = cats.SemigroupK[TestSemiK].algebra[String]
@@ -278,9 +284,11 @@ class SemiSpec extends Specification {
       result2 must beEqualTo(TestSemiK(List("b", "a")))
     }
 
+    @Semi(alleycats.Empty) final case class TestEmpty[A](a: A)
     "generate for alleycats.Empty" in {
       // given
-      @Semi(alleycats.Empty) final case class TestEmpty[A](a: A)
+      // test class moved outside as a workaround for error in 2.11:
+      //   can't existentially abstract over parameterized type TestEmpty[String]
 
       // when
       val result = alleycats.Empty[TestEmpty[String]].empty

modules/catnip/.js/lock.sbt

@@ -20,4 +20,4 @@ dependencyOverrides ++= Seq(
   "org.typelevel" % "machinist_sjs0.6_2.12" % "0.6.5",
   "org.typelevel" % "macro-compat_2.12" % "1.1.1"
 )
-// LIBRARY_DEPENDENCIES_HASH 3c6d978973e31cf767d13efdc069b2682bf4808f
+// LIBRARY_DEPENDENCIES_HASH 00c53c6e5d924d4cad98ded5d91dd811f6880dc2

modules/catnip/.jvm/lock.sbt

@@ -13,4 +13,4 @@ dependencyOverrides ++= Seq(
   "org.typelevel" % "machinist_2.12" % "0.6.5",
   "org.typelevel" % "macro-compat_2.12" % "1.1.1"
 )
-// LIBRARY_DEPENDENCIES_HASH 034fe611c66be1cd21d62f3d943e26ff345738b7
+// LIBRARY_DEPENDENCIES_HASH 79ffe92df636aa1d6c286e671daf2fe2f4fa8d65

modules/catnip/src/main/scala/io/scalaland/catnip/internals/DerivedImpl.scala

@@ -2,7 +2,7 @@ package io.scalaland.catnip.internals
 
 import scala.language.experimental.macros
 import scala.reflect.macros.whitebox.Context
-import scala.util.Try
+import scala.util.{ Failure, Success, Try }
 
 private[catnip] class DerivedImpl(config: Map[String, (String, List[String])])(val c: Context)(annottees: Seq[Any])
     extends Loggers {
@@ -105,9 +105,8 @@ private[catnip] class DerivedImpl(config: Map[String, (String, List[String])])(v
 
 private[catnip] object DerivedImpl {
 
-  private def loadConfig(name: String) =
+  private def loadConfig(name: String): Either[String, Map[String, (String, List[String])]] =
     Try {
-
       scala.io.Source
         .fromURL(getClass.getClassLoader.getResources(name).nextElement)
         .getLines
@@ -122,11 +121,11 @@ private[catnip] object DerivedImpl {
           typeClass.trim -> (generator -> otherRequiredTC)
         }
         .toMap
-    }.toEither.left.map {
-      case _: java.util.NoSuchElementException =>
-        s"Unable to load $name using ${getClass.getClassLoader}"
-      case err: Throwable =>
-        err.getMessage
+    } match {
+      case Success(value) => Right(value)
+      case Failure(_: java.util.NoSuchElementException) =>
+        Left(s"Unable to load $name using ${getClass.getClassLoader}")
+      case Failure(err: Throwable) => Left(err.getMessage)
     }
 
   private val mappingsE: Either[String, Map[String, (String, List[String])]] = loadConfig("derive.semi.conf")

project/Dependencies.scala

@@ -9,15 +9,14 @@ object Dependencies {
 
   // scala version
   val scalaOrganization  = "org.scala-lang" // "org.typelevel"
-  val scalaVersion       = "2.12.6" // "2.12.4-bin-typelevel-4"
-  val crossScalaVersions = Seq("2.12.6")
+  val scalaVersion       = "2.12.7" // "2.12.4-bin-typelevel-4"
+  val crossScalaVersions = Seq("2.11.12", "2.12.7", "2.13.0-M4")
 
   // build tools version
   val scalaFmtVersion = "1.5.1"
 
   // libraries versions
   val catsVersion     = "1.3.1"
-  val monixVersion    = "3.0.0-RC1"
   val specs2Version   = "4.3.4"
 
   // resolvers