enable continuations plugin and test

Author: lrytz

build.sbt

@@ -4,18 +4,11 @@ scalaVersion := version.value
 
 libraryDependencies += "org.scala-lang" % "scala-dist" % version.value
 
-// TODO: find out how to enable continuations plugin. also un-comment ContinuationsTest afterwards!
+// funky way to enable the continuations plugin.
 // http://stackoverflow.com/questions/24755254/how-to-enable-compiler-plugin-from-librarydependencies
-
-//autoCompilerPlugins := true
-
-//val addContinuationsPlugin = taskKey[Unit]("Add continuations plugin")
-
-//addContinuationsPlugin := {
-//  println(update.value.allModules.find(_.name contains "continuations-plugin"))
-//  compilerPlugin(update.value.allModules.find(_.name contains "continuations-plugin").get)
-//}
-
-//libraryDependencies += compilerPlugin(update.value.allModules.find(_.name contains "continuations-plugin").get)
-
-//scalacOptions += "-P:continuations:enable"
+scalacOptions ++= {
+  val compileConfig = update.value.configurations.find(_.configuration == "compile").get
+  val pluginModule = compileConfig.modules.find(_.module.name contains "continuations-plugin").get
+  val pluginFile = pluginModule.artifacts.head._2
+  Seq(s"-Xplugin:${pluginFile.getCanonicalPath}", "-P:continuations:enable")
+}

src/main/scala/scaladist/ContinuationsTest.scala

@@ -3,14 +3,12 @@ package scaladist
 import scala.util.continuations._
 
 object ContinuationsTest {
-  /*
-  def foo(): Int @cps[Int] = { // could leave out return type
+  def foo(): Int @cps[Int] = {
     shift { k: (Int=>Int) =>
       k(7)
     } + 1
   }
-  */
   def test(): Unit = {
-    // assert(reset(2 * foo()) == 16)
+    assert(reset(2 * foo()) == 16)
   }
 }