Update to Scala 2.12.10

.travis.yml

@@ -1,6 +1,6 @@
 language: scala
 scala:
-- 2.11.11
+- 2.12.10
 jdk:
 - openjdk8
 script:

build.sbt

@@ -1,4 +1,6 @@
-val scalaExercisesV = "0.4.0-SNAPSHOT"
+import ProjectPlugin.autoImport._
+
+val scalaExercisesV = "0.5.0-SNAPSHOT"
 
 def dep(artifactId: String) = "org.scala-exercises" %% artifactId % scalaExercisesV
 
@@ -9,9 +11,10 @@ lazy val `scala-tutorial` = (project in file("."))
     libraryDependencies ++= Seq(
       dep("exercise-compiler"),
       dep("definitions"),
-      %%("scalatest"),
-      %%("scalacheck"),
-      %%("scheckShapeless")
+      %%("shapeless", V.shapeless),
+      %%("scalatest", V.scalatest),
+      %%("scalacheck", V.scalacheck),
+      "com.github.alexarchambault" %% "scalacheck-shapeless_1.14" % V.scalacheckShapeless
     )
   )
 

project/ProjectPlugin.scala

@@ -1,5 +1,5 @@
-import de.heikoseeberger.sbtheader.HeaderPattern
 import de.heikoseeberger.sbtheader.HeaderPlugin.autoImport._
+import de.heikoseeberger.sbtheader.License._
 import sbt.Keys._
 import sbt._
 import sbtorgpolicies._
@@ -12,6 +12,19 @@ object ProjectPlugin extends AutoPlugin {
 
   override def requires: Plugins = plugins.JvmPlugin && OrgPoliciesPlugin
 
+  object autoImport {
+
+    lazy val V = new {
+      val scala212: String            = "2.12.10"
+      val shapeless: String           = "2.3.3"
+      val scalatest: String           = "3.0.8"
+      val scalacheck: String          = "1.14.2"
+      val scalacheckShapeless: String = "1.2.3"
+    }
+  }
+
+  import autoImport._
+
   override def projectSettings: Seq[Def.Setting[_]] =
     Seq(
       description := "Scala Exercises: The path to enlightenment",
@@ -25,23 +38,17 @@ object ProjectPlugin extends AutoPlugin {
         organizationEmail = "hello@47deg.com"
       ),
       orgLicenseSetting := ApacheLicense,
-      scalaVersion := "2.11.11",
+      scalaVersion := V.scala212,
       scalaOrganization := "org.scala-lang",
-      crossScalaVersions := Seq("2.11.11"),
       resolvers ++= Seq(
         Resolver.mavenLocal,
         Resolver.sonatypeRepo("snapshots"),
         Resolver.sonatypeRepo("releases")
       ),
       scalacOptions := sbtorgpolicies.model.scalacCommonOptions,
-      headers := Map(
-        "scala" -> (HeaderPattern.cStyleBlockComment,
-          s"""|/*
-              | * scala-exercises - ${name.value}
-              | * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
-              | */
-              |
-            |""".stripMargin)
-      )
+      headerLicense := Some(Custom(s"""| scala-exercises - ${name.value}
+                                       | Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+                                       |
+                                       |""".stripMargin))
     )
 }

project/build.properties

@@ -1 +1 @@
-sbt.version=0.13.13
+sbt.version=1.2.8

project/plugins.sbt

@@ -2,5 +2,5 @@ resolvers ++= Seq(
   Resolver.sonatypeRepo("snapshots")
 )
 
-addSbtPlugin("org.scala-exercises" % "sbt-exercise" % "0.4.0-SNAPSHOT", "0.13", "2.10")
-addSbtPlugin("com.47deg"         % "sbt-org-policies" % "0.5.13")
+addSbtPlugin("org.scala-exercises" % "sbt-exercise"     % "0.5.0-SNAPSHOT")
+addSbtPlugin("com.47deg"           % "sbt-org-policies" % "0.12.0-M3")

src/main/scala/scalatutorial/ScalaTutorial.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial

src/main/scala/scalatutorial/sections/ClassesVsCaseClasses.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.sections

src/main/scala/scalatutorial/sections/DefinitionsAndEvaluation.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.sections

src/main/scala/scalatutorial/sections/FunctionalLoops.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.sections

src/main/scala/scalatutorial/sections/HigherOrderFunctions.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.sections
@@ -158,10 +159,9 @@ object HigherOrderFunctions extends ScalaTutorialSection {
    */
   def tailRecSum(res0: Int, res1: Int): Unit = {
     def sum(f: Int => Int, a: Int, b: Int): Int = {
-      def loop(x: Int, acc: Int): Int = {
+      def loop(x: Int, acc: Int): Int =
         if (x > b) acc
         else loop(x + res0, acc + f(x))
-      }
       loop(a, res1)
     }
     sum(x => x, 1, 10) shouldBe 55

src/main/scala/scalatutorial/sections/ImperativeProgramming.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.sections

src/main/scala/scalatutorial/sections/LazyEvaluation.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.sections

src/main/scala/scalatutorial/sections/LexicalScopes.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.sections

src/main/scala/scalatutorial/sections/ObjectOrientedProgramming.scala

@@ -1,11 +1,12 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.sections
 
-import scalatutorial.utils.{Empty, IntSet, NonEmpty}
+import scalatutorial.utils.{Empty, NonEmpty}
 
 /** @param name object_oriented_programming */
 object ObjectOrientedProgramming extends ScalaTutorialSection {

src/main/scala/scalatutorial/sections/PolymorphicTypes.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.sections

src/main/scala/scalatutorial/sections/ScalaTutorialSection.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.sections

src/main/scala/scalatutorial/sections/StandardLibrary.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.sections

src/main/scala/scalatutorial/sections/StructuringInformation.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.sections

src/main/scala/scalatutorial/sections/SyntacticConveniences.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.sections
@@ -49,7 +50,7 @@ object SyntacticConveniences extends ScalaTutorialSection {
   def tuples(res0: (Int, String)): Unit = {
     def pair(i: Int, s: String): (Int, String) = (i, s)
 
-    pair(42, "foo") shouldBe (42, "foo")
+    pair(42, "foo") shouldBe ((42, "foo"))
     pair(0, "bar") shouldBe res0
   }
 

src/main/scala/scalatutorial/sections/TailRecursion.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.sections

src/main/scala/scalatutorial/sections/TermsAndTypes.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.sections

src/main/scala/scalatutorial/sections/TypeClasses.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.sections

src/main/scala/scalatutorial/utils/BankAccount.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.utils

src/main/scala/scalatutorial/utils/IntSet.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.utils

src/main/scala/scalatutorial/utils/Note.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.utils

src/main/scala/scalatutorial/utils/Rational.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.utils

src/main/scala/scalatutorial/utils/animals.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.utils

src/main/scala/scalatutorial/utils/sorting.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.utils

src/test/scala/scalatutorial/sections/ClassesVsCaseClassesSpec.scala

@@ -1,25 +1,26 @@
 /*
- * scala-exercises - exercises-scalatutorial
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-scalatutorial
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package scalatutorial.sections
 
-import org.scalacheck.Shapeless._
+import org.scalacheck.ScalacheckShapeless._
 import org.scalaexercises.Test
-import org.scalatest.Spec
-import org.scalatest.prop.Checkers
+import org.scalatest.refspec.RefSpec
+import org.scalatestplus.scalacheck.Checkers
 import shapeless.HNil
 
-class ClassesVsCaseClassesSpec extends Spec with Checkers {
+class ClassesVsCaseClassesSpec extends RefSpec with Checkers {
 
-  def `check creation and manipulation`: Unit =
+  def `check creation and manipulation`(): Unit =
     check(Test.testSuccess(ClassesVsCaseClasses.creationAndManipulation _, "C" :: HNil))
 
-  def `check equality`: Unit =
+  def `check equality`(): Unit =
     check(Test.testSuccess(ClassesVsCaseClasses.equality _, false :: true :: HNil))
 
-  def `check encoding`: Unit =
+  def `check encoding`(): Unit =
     check(
       Test.testSuccess(
         ClassesVsCaseClasses.encoding _,