Fix compilation warnings

cache/src/main/scala/coursier/TermDisplay.scala

@@ -455,7 +455,7 @@ class TermDisplay(
 
   /**
     *
-    * @return: whether any message was printed by this `TermDisplay`
+    * @return whether any message was printed by this `TermDisplay`
     */
   def stopDidPrintSomething(): Boolean = {
     scheduler.shutdown()

cli/src/main/scala-2.11/coursier/cli/Helper.scala

@@ -163,6 +163,9 @@ class Helper(
   }
 
 
+  val loggerFallbackMode =
+    !progress && TermDisplay.defaultFallbackMode
+
   val (scaladexRawDependencies, otherRawDependencies) =
     rawDependencies.partition(s => s.contains("/") || !s.contains(":"))
 
@@ -364,9 +367,6 @@ class Helper(
     mapDependencies = if (typelevel) Some(Typelevel.swap(_)) else None
   )
 
-  val loggerFallbackMode =
-    !progress && TermDisplay.defaultFallbackMode
-
   val logger =
     if (verbosityLevel >= 0)
       Some(new TermDisplay(
@@ -465,7 +465,7 @@ class Helper(
             iterationCounter,
             0
           )
-        ).run
+        ).unsafePerformSync
 
         Console.err.println(s"Overhead: ${resolutionCounter.value - iterationCounter.value} ms")
 
@@ -491,7 +491,7 @@ class Helper(
         val res0 = startRes
           .process
           .run(fetch0, maxIterations)
-          .run
+          .unsafePerformSync
         val end = System.currentTimeMillis()
 
         Console.err.println(s"Resolution ${index + 1} / ${-benchmark}: ${end - start} ms")
@@ -515,7 +515,7 @@ class Helper(
       startRes
         .process
         .run(fetch0, maxIterations)
-        .run
+        .unsafePerformSync
 
   logger.foreach(_.stop())
 
@@ -674,7 +674,7 @@ class Helper(
 
     val task = Task.gatherUnordered(tasks)
 
-    val results = task.run
+    val results = task.unsafePerformSync
     val errors = results.collect{case (artifact, -\/(err)) => artifact -> err }
     val files0 = results.collect{case (artifact, \/-(f)) => f }
 

cli/src/main/scala-2.11/coursier/cli/scaladex/Scaladex.scala

@@ -8,6 +8,7 @@ import argonaut._, Argonaut._, ArgonautShapeless._
 import coursier.core.{ Artifact, Attributes }
 import coursier.{ Fetch, Module }
 
+import scala.language.higherKinds
 import scalaz.{ -\/, EitherT, Monad, Nondeterminism, \/, \/- }
 import scalaz.Scalaz.ToEitherOps
 import scalaz.Scalaz.ToEitherOpsFromEither

sbt-coursier/src/main/scala-2.10/coursier/ResolutionError.scala

@@ -43,7 +43,7 @@ object ResolutionError {
   final case class UnknownDownloadException(ex: Throwable) extends ResolutionError
   final case class Conflicts(description: String) extends ResolutionError
 
-  final case class MetadataDownloadErrors(errors: Seq[(Dependency, Seq[String])]) extends ResolutionError {
+  final case class MetadataDownloadErrors(errors: Seq[((Module, String), Seq[String])]) extends ResolutionError {
     def description(): String = {
 
       def grouped(errs: Seq[String]) =
@@ -64,8 +64,8 @@ object ResolutionError {
 
       lines += s"Encountered ${errors.length} error(s) in dependency resolution:"
 
-      for ((dep, errs) <- errors) {
+      for (((mod, ver), errs) <- errors) {
-        lines += s"  ${dep.module}:${dep.version}:"
+        lines += s"  $mod:$ver:"
 
         for ((type0, errs0) <- grouped(errs))
           if (type0.isEmpty)

sbt-coursier/src/main/scala-2.10/coursier/Tasks.scala

@@ -677,7 +677,7 @@ object Tasks {
           startRes
             .process
             .run(fetch, maxIterations)
-            .attemptRun
+            .unsafePerformSyncAttempt
             .leftMap(ex =>
               ResolutionError.UnknownException(ex)
                 .throwException()
@@ -704,17 +704,17 @@ object Tasks {
           ).throwException()
         }
 
-        if (res.errors.nonEmpty) {
+        if (res.metadataErrors.nonEmpty) {
           val internalRepositoriesLen = internalRepositories.length
           val errors =
             if (repositories.length > internalRepositoriesLen)
             // drop internal repository errors
-              res.errors.map {
+              res.metadataErrors.map {
                 case (dep, errs) =>
                   dep -> errs.drop(internalRepositoriesLen)
               }
             else
-              res.errors
+              res.metadataErrors
 
           ResolutionError.MetadataDownloadErrors(errors)
             .throwException()
@@ -823,7 +823,7 @@ object Tasks {
 
         artifactsLogger.init(if (printOptionalMessage) log.info(artifactInitialMessage))
 
-        Task.gatherUnordered(artifactFileOrErrorTasks).attemptRun match {
+        Task.gatherUnordered(artifactFileOrErrorTasks).unsafePerformSyncAttempt match {
           case -\/(ex) =>
             ResolutionError.UnknownDownloadException(ex)
               .throwException()

sbt-launcher/src/main/scala/coursier/sbtlauncher/AppProvider.scala

@@ -2,6 +2,8 @@ package coursier.sbtlauncher
 
 import java.io.File
 
+import scala.language.existentials
+
 final case class AppProvider(
   scalaProvider: xsbti.ScalaProvider,
   id: xsbti.ApplicationID,

sbt-launcher/src/main/scala/coursier/sbtlauncher/Launcher.scala

@@ -10,6 +10,7 @@ import coursier.ivy.IvyRepository
 import coursier.maven.MavenSource
 
 import scala.annotation.tailrec
+import scala.language.reflectiveCalls
 import scalaz.{-\/, \/-}
 import scalaz.concurrent.Task
 

tests/jvm/src/test/scala/coursier/test/ChecksumTests.scala

@@ -59,7 +59,7 @@ object ChecksumTests extends TestSuite {
           sumType,
           cache,
           Strategy.DefaultExecutorService
-        ).run.run
+        ).run.unsafePerformSync
 
       def artifact(url: String) = Artifact(
         url,

tests/jvm/src/test/scala/coursier/test/compatibility/package.scala

@@ -10,7 +10,7 @@ package object compatibility {
   implicit val executionContext = scala.concurrent.ExecutionContext.global
 
   implicit class TaskExtensions[T](val underlying: Task[T]) extends AnyVal {
-    def runF: Future[T] = Future.successful(underlying.run)
+    def runF: Future[T] = Future.successful(underlying.unsafePerformSync)
   }
 
   def textResource(path: String)(implicit ec: ExecutionContext): Future[String] = Future {