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 +1,5 @@
-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 +10,10 @@ lazy val fpinscala = (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

@@ -1,4 +1,4 @@
-import de.heikoseeberger.sbtheader.HeaderPattern
+import de.heikoseeberger.sbtheader.License._
 import de.heikoseeberger.sbtheader.HeaderPlugin.autoImport._
 import sbt.Keys._
 import sbt._
@@ -12,6 +12,20 @@ object ProjectPlugin extends AutoPlugin {
 
   override def requires: Plugins = plugins.JvmPlugin && OrgPoliciesPlugin
 
+  object autoImport {
+
+    lazy val V = new {
+      val scala212: String            = "2.12.10"
+      val cats: String = "2.0.0"
+      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 +39,17 @@ object ProjectPlugin extends AutoPlugin {
         organizationEmail = "[email protected]"
       ),
       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 := scalacCommonOptions ++ scalacLanguageOptions,
-      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/fpinscalalib/ErrorHandlingSection.scala

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

src/main/scala/fpinscalalib/FPinScalaLibrary.scala

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

src/main/scala/fpinscalalib/FunctionalDataStructuresSection.scala

@@ -1,12 +1,12 @@
 /*
- * scala-exercises - exercises-fpinscala
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-fpinscala
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package fpinscalalib
 
 import org.scalatest.{FlatSpec, Matchers}
-import fpinscalalib.customlib._
 import fpinscalalib.customlib.functionaldatastructures._
 import fpinscalalib.customlib.functionaldatastructures.List._
 import Tree._

src/main/scala/fpinscalalib/FunctionalParallelismSection.scala

@@ -1,12 +1,11 @@
 /*
- * scala-exercises - exercises-fpinscala
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-fpinscala
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package fpinscalalib
 
-import java.util.concurrent.ExecutorService
-
 import fpinscalalib.customlib.functionalparallelism.Par
 import fpinscalalib.customlib.functionalparallelism.Par._
 import org.scalatest.{FlatSpec, Matchers}

src/main/scala/fpinscalalib/FunctionalStateSection.scala

@@ -1,14 +1,14 @@
 /*
- * scala-exercises - exercises-fpinscala
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-fpinscala
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package fpinscalalib
 
 import fpinscalalib.customlib.state.RNG.Simple
 import fpinscalalib.customlib.state.RNG._
 import org.scalatest.{FlatSpec, Matchers}
-import org.scalacheck.Shapeless._
 import fpinscalalib.customlib.state._
 
 /** @param name pure_functional_state

src/main/scala/fpinscalalib/GettingStartedWithFPSection.scala

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

src/main/scala/fpinscalalib/ParserCombinatorsSection.scala

@@ -1,17 +1,18 @@
 /*
- * scala-exercises - exercises-fpinscala
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-fpinscala
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package fpinscalalib
 
 import org.scalatest.{FlatSpec, Matchers}
-import fpinscalalib.customlib.parsing.{JSON, Location, ParseError, Reference}
+import fpinscalalib.customlib.parsing.{JSON, ParseError, Reference}
 import fpinscalalib.customlib.parsing.ReferenceTypes._
 import Reference._
 import scala.util.matching.Regex
 
-/** @param name parser_combinators
+/** @param name parser_combinatorss
  */
 object ParserCombinatorsSection
     extends FlatSpec

src/main/scala/fpinscalalib/PropertyBasedTestingSection.scala

@@ -1,16 +1,14 @@
 /*
- * scala-exercises - exercises-fpinscala
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-fpinscala
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package fpinscalalib
 
-import java.util.concurrent.Executors
-
-import fpinscalalib.customlib.functionalparallelism.Par
 import fpinscalalib.customlib.state.{RNG, State}
 import org.scalatest.{FlatSpec, Matchers}
-import fpinscalalib.customlib.testing.{Gen, Prop, SGen}
+import fpinscalalib.customlib.testing.{Gen, SGen}
 import fpinscalalib.customlib.testing.Gen._
 import fpinscalalib.customlib.testing.Prop._
 

src/main/scala/fpinscalalib/StrictnessAndLazinessSection.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-fpinscala
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-fpinscala
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package fpinscalalib
@@ -9,7 +10,6 @@ import fpinscalalib.customlib.laziness._
 import fpinscalalib.customlib.laziness.Stream
 import fpinscalalib.customlib.laziness.Stream._
 import org.scalatest.{FlatSpec, Matchers}
-import fpinscalalib.customlib.laziness.ExampleHelper._
 
 /** @param name strictness_and_laziness
  */

src/main/scala/fpinscalalib/customlib/errorhandling/EitherHelper.scala

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

src/main/scala/fpinscalalib/customlib/errorhandling/ExampleHelper.scala

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

src/main/scala/fpinscalalib/customlib/errorhandling/OptionHelper.scala

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

src/main/scala/fpinscalalib/customlib/functionaldatastructures/ListHelper.scala

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

src/main/scala/fpinscalalib/customlib/functionaldatastructures/TreeHelper.scala

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

src/main/scala/fpinscalalib/customlib/functionalparallelism/ParHelper.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-fpinscala
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-fpinscala
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package fpinscalalib.customlib.functionalparallelism
@@ -148,7 +149,6 @@ object Par {
 }
 
 object Examples {
-  import Par._
   def sum(ints: IndexedSeq[Int]): Int = // `IndexedSeq` is a superclass of random-access sequences like `Vector` in the standard library. Unlike lists, these sequences provide an efficient `splitAt` method for dividing them into two parts at a particular index.
     if (ints.size <= 1)
       ints.headOption getOrElse 0 // `headOption` is a method defined on all collections in Scala. We saw this function in chapter 3.

src/main/scala/fpinscalalib/customlib/laziness/ExampleHelper.scala

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

src/main/scala/fpinscalalib/customlib/laziness/StreamHelper.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-fpinscala
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-fpinscala
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package fpinscalalib.customlib.laziness
@@ -160,16 +161,16 @@ trait Stream[+A] {
   def zipWithAll[B, C](s2: Stream[B])(f: (Option[A], Option[B]) => C): Stream[C] =
     Stream.unfold((this, s2)) {
       case (Empty, Empty)               => None
-      case (Cons(h, t), Empty)          => Some(f(Some(h()), Option.empty[B]) -> (t(), empty[B]))
+      case (Cons(h, t), Empty)          => Some(f(Some(h()), Option.empty[B]) -> Tuple2(t(), empty[B]))
       case (Empty, Cons(h, t))          => Some(f(Option.empty[A], Some(h())) -> (empty[A] -> t()))
       case (Cons(h1, t1), Cons(h2, t2)) => Some(f(Some(h1()), Some(h2())) -> (t1() -> t2()))
     }
 
   /*
   `s startsWith s2` when corresponding elements of `s` and `s2` are all equal, until the point that `s2` is exhausted. If `s` is exhausted first, or we find an element that doesn't match, we terminate early. Using non-strictness, we can compose these three separate logical steps--the zipping, the termination when the second stream is exhausted, and the termination if a nonmatching element is found or the first stream is exhausted.
    */
-  def startsWith[A](s: Stream[A]): Boolean =
-    zipAll(s).takeWhile(!_._2.isEmpty) forAll {
+  def startsWith[T](s: Stream[T]): Boolean =
+    zipAll(s).takeWhile(_._2.isDefined) forAll {
       case (h, h2) => h == h2
     }
 
@@ -182,7 +183,7 @@ trait Stream[+A] {
       case s     => Some((s, s drop 1))
     } append Stream(empty)
 
-  def hasSubsequence[A](s: Stream[A]): Boolean =
+  def hasSubsequence[T](s: Stream[T]): Boolean =
     tails exists (_ startsWith s)
 
   /*

src/main/scala/fpinscalalib/customlib/parsing/JSON.scala

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

src/main/scala/fpinscalalib/customlib/parsing/ParsersHelper.scala

@@ -1,6 +1,7 @@
 /*
- * scala-exercises - exercises-fpinscala
- * Copyright (C) 2015-2016 47 Degrees, LLC. <http://www.47deg.com>
+ *  scala-exercises - exercises-fpinscala
+ *  Copyright (C) 2015-2019 47 Degrees, LLC. <http://www.47deg.com>
+ *
  */
 
 package fpinscalalib.customlib.parsing
@@ -200,7 +201,7 @@ case class Location(input: String, offset: Int = 0) {
 
   /* Returns the line corresponding to this location */
   def currentLine: String =
-    if (input.length > 1) input.lines.drop(line - 1).next
+    if (input.length > 1) input.linesIterator.drop(line - 1).next
     else ""
 
   def columnCaret = (" " * (col - 1)) + "^"