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IntelliJ keeps removing the import of context.dispatcher from akka tutorial

I am following the akka-in-action tutorial and in chapter 2, there is a class (https://github.com/RayRoestenburg/akka-in-action/blob/master/chapter2/src/main/scala/com/goticks/RestInterface.scala):

trait RestApi extends HttpService with ActorLogging { actor: Actor =>
  import context.dispatcher
  import com.goticks.TicketProtocol._
  ...

The import context.dispatcher is never used, but it is defined with a comment:

  /**
   * Returns the dispatcher (MessageDispatcher) that is used for this Actor.
   * Importing this member will place an implicit ExecutionContext in scope.
   */
  implicit def dispatcher: ExecutionContextExecutor

However, IntelliJ keeps marking the import as "unused" and removing it upon "optimize imports" causing an error value pipeTo is not a member of scala.concurrent.Future[Any].

Is there a way to tell IntelliJ that this import is not intended to be "used", but just to simply provide a context?

Or should the tutorial be updated to not use such "unused import"?

Solution

  • This looks like issue SCL-9326 to me. IntelliJ 15 has a nice fix for this: press alt-enter (on a Mac) and select "mark this import as always used in this project".