-Xfatal-warnings in most subprojects

build.sbt

@@ -193,6 +193,7 @@ val completeProj = (project in file("internal") / "util-complete")
     testedBaseSettings,
     name := "Completion",
     libraryDependencies += jline,
+    Compile / scalacOptions += "-Ywarn-unused:-explicits",
     mimaSettings,
     // Parser is used publicly, so we can't break bincompat.
     mimaBinaryIssueFilters := Seq(
@@ -221,6 +222,7 @@ lazy val testingProj = (project in file("testing"))
     baseSettings,
     name := "Testing",
     libraryDependencies ++= Seq(testInterface, launcherInterface, sjsonNewScalaJson.value),
+    Compile / scalacOptions += "-Ywarn-unused:-locals,-explicits,-privates",
     managedSourceDirectories in Compile +=
       baseDirectory.value / "src" / "main" / "contraband-scala",
     sourceManaged in (Compile, generateContrabands) := baseDirectory.value / "src" / "main" / "contraband-scala",
@@ -294,6 +296,7 @@ lazy val runProj = (project in file("run"))
   .settings(
     testedBaseSettings,
     name := "Run",
+    Compile / scalacOptions += "-Ywarn-unused:-locals,-explicits,-privates",
     managedSourceDirectories in Compile +=
       baseDirectory.value / "src" / "main" / "contraband-scala",
     sourceManaged in (Compile, generateContrabands) := baseDirectory.value / "src" / "main" / "contraband-scala",
@@ -398,10 +401,9 @@ lazy val protocolProj = (project in file("protocol"))
   .dependsOn(collectionProj)
   .settings(
     testedBaseSettings,
-    scalacOptions -= "-Ywarn-unused",
-    scalacOptions += "-Xlint:-unused",
     name := "Protocol",
     libraryDependencies ++= Seq(sjsonNewScalaJson.value, ipcSocket),
+    Compile / scalacOptions += "-Ywarn-unused:-locals,-explicits,-privates",
     managedSourceDirectories in Compile +=
       baseDirectory.value / "src" / "main" / "contraband-scala",
     sourceManaged in (Compile, generateContrabands) := baseDirectory.value / "src" / "main" / "contraband-scala",
@@ -443,6 +445,7 @@ lazy val commandProj = (project in file("main-command"))
     testedBaseSettings,
     name := "Command",
     libraryDependencies ++= Seq(launcherInterface, sjsonNewScalaJson.value, templateResolverApi),
+    Compile / scalacOptions += "-Ywarn-unused:-locals,-explicits,-privates",
     managedSourceDirectories in Compile +=
       baseDirectory.value / "src" / "main" / "contraband-scala",
     sourceManaged in (Compile, generateContrabands) := baseDirectory.value / "src" / "main" / "contraband-scala",
@@ -546,6 +549,7 @@ lazy val mainProj = (project in file("main"))
     testedBaseSettings,
     name := "Main",
     libraryDependencies ++= scalaXml.value ++ Seq(launcherInterface) ++ log4jDependencies ++ Seq(scalaCacheCaffeine),
+    Compile / scalacOptions -= "-Xfatal-warnings",
     managedSourceDirectories in Compile +=
       baseDirectory.value / "src" / "main" / "contraband-scala",
     sourceManaged in (Compile, generateContrabands) := baseDirectory.value / "src" / "main" / "contraband-scala",

main-actions/src/main/scala/sbt/Package.scala

@@ -106,6 +106,7 @@ object Package {
     val inputFiles = conf.sources.map(_._1).toSet
     val inputs = conf.sources :+: lastModified(inputFiles) :+: manifest :+: HNil
     cachedMakeJar(inputs)(() => exists(conf.jar))
+    ()
   }
 
   /**

main/src/main/scala/sbt/internal/LibraryManagement.scala

@@ -53,7 +53,7 @@ private[sbt] object LibraryManagement {
       val finalReport = transform(report)
 
       // Warn of any eviction and compatibility warnings
-      val ew = EvictionWarning(module, ewo, finalReport, log)
+      val ew = EvictionWarning(module, ewo, finalReport)
       ew.lines.foreach(log.warn(_))
       ew.infoAllTheThings.foreach(log.info(_))
       CompatibilityWarning.run(compatWarning, module, mavenStyle, log)

main/src/test/scala/sbt/internal/TestBuild.scala

@@ -43,7 +43,7 @@ abstract class TestBuild {
   implicit val tGen = Arbitrary { genTasks(lowerIDGen, MaxDepsGen, MaxTasksGen) }
   val seed = rng.Seed.random
 
-  final class Keys(val env: Env, val scopes: Seq[Scope]) {
+  class Keys(val env: Env, val scopes: Seq[Scope]) {
     override def toString = env + "\n" + scopes.mkString("Scopes:\n\t", "\n\t", "")
     lazy val delegated = scopes map env.delegates
   }
@@ -119,7 +119,7 @@ abstract class TestBuild {
       (taskAxes, zero.toSet, single.toSet, multi.toSet)
     }
   }
-  final case class Env(builds: Vector[Build], tasks: Vector[Taskk]) {
+  case class Env(builds: Vector[Build], tasks: Vector[Taskk]) {
     override def toString =
       "Env:\n  " + "  Tasks:\n    " + tasks.mkString("\n    ") + "\n" + builds.mkString("\n  ")
     val root = builds.head
@@ -159,7 +159,7 @@ abstract class TestBuild {
   }
   def getKey: Taskk => AttributeKey[_] = _.key
   def toConfigKey: Configuration => ConfigKey = c => ConfigKey(c.name)
-  final case class Build(uri: URI, projects: Seq[Proj]) {
+  case class Build(uri: URI, projects: Seq[Proj]) {
     override def toString = "Build " + uri.toString + " :\n    " + projects.mkString("\n    ")
     val allProjects = projects map { p =>
       (ProjectRef(uri, p.id), p)
@@ -167,7 +167,7 @@ abstract class TestBuild {
     val root = projects.head
     val projectMap = mapBy(projects)(_.id)
   }
-  final case class Proj(
+  case class Proj(
       id: String,
       delegates: Seq[ProjectRef],
       configurations: Seq[Configuration]
@@ -178,7 +178,7 @@ abstract class TestBuild {
     val confMap = mapBy(configurations)(_.name)
   }
 
-  final case class Taskk(key: AttributeKey[String], delegates: Seq[Taskk]) {
+  case class Taskk(key: AttributeKey[String], delegates: Seq[Taskk]) {
     override def toString =
       key.label + " (delegates: " + delegates.map(_.key.label).mkString(", ") + ")"
   }

project/plugins.sbt

@@ -1,7 +1,7 @@
 scalaVersion := "2.12.6"
 scalacOptions ++= Seq("-feature", "-language:postfixOps")
 
-addSbtPlugin("org.scala-sbt"     % "sbt-houserules"  % "0.3.7")
+addSbtPlugin("org.scala-sbt"     % "sbt-houserules"  % "0.3.8")
 addSbtPlugin("org.scala-sbt"     % "sbt-contraband"  % "0.4.0")
 addSbtPlugin("de.heikoseeberger" % "sbt-header"      % "3.0.2")
 addSbtPlugin("com.eed3si9n"      % "sbt-buildinfo"   % "0.8.0")

sbt/src/test/scala/sbt/RunFromSourceMain.scala

@@ -118,7 +118,7 @@ object RunFromSourceMain {
           def globalLock = noGlobalLock
           def bootDirectory = RunFromSourceMain.bootDirectory
           def ivyHome = file(sys.props("user.home")) / ".ivy2"
-          final case class PredefRepo(id: Predefined) extends PredefinedRepository
+          case class PredefRepo(id: Predefined) extends PredefinedRepository
           import Predefined._
           def ivyRepositories = Array(PredefRepo(Local), PredefRepo(MavenCentral))
           def appRepositories = Array(PredefRepo(Local), PredefRepo(MavenCentral))

scripted-plugin/src/main/scala/sbt/ScriptedPlugin.scala

@@ -8,3 +8,4 @@
 package sbt
 
 // ScriptedPlugin has moved to main.
+private[sbt] object ScriptedPluginNote