Make ParIterableLike extend IterableOnce

Author: julienrf

core/src/main/scala/scala/collection/parallel/ParIterableLike.scala

@@ -147,7 +147,8 @@ import scala.reflect.ClassTag
  */
 trait ParIterableLike[+T, +CC[X] <: ParIterable[X], +Repr <: ParIterable[T], +Sequential <: Iterable[T] with IterableOps[T, Iterable /* TODO */, Sequential]]
 extends /*GenIterableLike[T, Repr]
-   with*/ CustomParallelizable[T, Repr]
+   with*/ IterableOnce[T]
+   with CustomParallelizable[T, Repr]
    with Parallel
    with HasNewCombiner[T, Repr]
 {

core/src/main/scala/scala/collection/parallel/ParSeq.scala

@@ -43,6 +43,7 @@ trait ParSeq[+T] extends /*GenSeq[T]
 
   // TODO remove these definitions inlined from ParSeqLike
   final def size: Int = length
+  final def knownSize = length
   def length: Int
 }