Fix compilation errors and minor update to the futures.md

akka-docs/src/main/paradox/futures.md

@@ -95,8 +95,8 @@ or a `ClassCastException` if not. Handling `Exception`s will be discussed furthe
 
 ## Use the pipe pattern
 
-Another useful message-transfer pattern is "pipe", which is to send the result of `Future` to another actor, upon completion of the `Future`.
-The pipe pattern can be used by importing @java[`akka.pattern.PatternsCS.pipe`.]@scala[`akka.pattern.pipe`, and define or import an implicit instance of `ExecutionContext` in the scope.
+Another useful message-transfer pattern is "pipe", which is to send the result of @scala[`Future`]@java[`CompletableFuture`] to another actor, upon completion of the @scala[`Future`]@java[`CompletableFuture`].
+The pipe pattern can be used by importing @java[`akka.pattern.PatternsCS.pipe`.]@scala[`akka.pattern.pipe`, and define or import an implicit instance of `ExecutionContext` in the scope.]
 
 Scala
 :  @@snip [FutureDocSpec.scala]($code$/scala/docs/future/FutureDocSpec.scala) { #pipe-to-usage }

akka-docs/src/test/scala/docs/future/FutureDocSpec.scala

@@ -38,11 +38,13 @@ object FutureDocSpec {
   //#pipe-to-usage
   class ActorUsingPipeTo(target: ActorRef) extends Actor {
     // akka.pattern.pipe needs to be imported
-    import akka.pattern.{ask, pipe}
+    import akka.pattern.{ ask, pipe }
     // implicit ExecutionContext should be in scope
     implicit val ec: ExecutionContext = context.dispatcher
+    implicit val timeout: Timeout = 5.seconds
 
     def receive = {
+      case _ ⇒
         val future = target ? "some message"
         future pipeTo sender() // use the pipe pattern
     }