1 files changed, 23 insertions, 0 deletions
diff --git a/src/library/scala/collection/parallel/ParIterableView.scala b/src/library/scala/collection/parallel/ParIterableView.scala
index dd703b5c8b..5efe87c9ee 100644
--- a/src/library/scala/collection/parallel/ParIterableView.scala
+++ b/src/library/scala/collection/parallel/ParIterableView.scala
@@ -6,6 +6,7 @@ package scala.collection.parallel
 import scala.collection.Parallel
 import scala.collection.TraversableViewLike
 import scala.collection.IterableView
+import scala.collection.generic.CanCombineFrom
 
 
 
@@ -23,6 +24,28 @@ extends ParIterableViewLike[T, Coll, CollSeq, ParIterableView[T, Coll, CollSeq],
 
 
 
+object ParIterableView {
+  abstract class NoCombiner[T] extends Combiner[T, Nothing] {
+    self: EnvironmentPassingCombiner[T, Nothing] =>
+    def +=(elem: T): this.type = this
+    def iterator: Iterator[T] = Iterator.empty
+    def result() = throw new UnsupportedOperationException("ParIterableView.Combiner.result")
+    def size = throw new UnsupportedOperationException("ParIterableView.Combiner.size")
+    def clear() {}
+    def combine[N <: T, NewTo >: Nothing](other: Combiner[N, NewTo]) =
+      throw new UnsupportedOperationException("ParIterableView.Combiner.result")
+  }
+
+  type Coll = ParIterableView[_, C, _] forSome { type C <: ParIterable[_] }
+
+  implicit def canBuildFrom[T]: CanCombineFrom[Coll, T, ParIterableView[T, ParIterable[T], Iterable[T]]] =
+    new CanCombineFrom[Coll, T, ParIterableView[T, ParIterable[T], Iterable[T]]] {
+      def apply(from: Coll) = new NoCombiner[T] with EnvironmentPassingCombiner[T, Nothing]
+      def apply() = new NoCombiner[T] with EnvironmentPassingCombiner[T, Nothing]
+    }
+}
+
+