updates to scalax collections and standard libr...

updates to scalax collections and standard library classes.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/library/scalax/collection/generic/IterableFactory.scala b/src/library/scalax/collection/generic/IterableFactory.scala
index 264e333ac5..1362e97079 100755
--- a/src/library/scalax/collection/generic/IterableFactory.scala
+++ b/src/library/scalax/collection/generic/IterableFactory.scala
@@ -8,6 +8,9 @@ trait IterableFactory[CC[A] <: Iterable[A]] {
   protected def newBuilder[A]: Builder[CC, A] =
     apply().newBuilder[A].asInstanceOf[Builder[CC, A]]
 
+  // can't have an empty here because it is defined in subclass covariant.IterableFactory with type
+  // CC[Nothing]. This type does not make sense for immutable iterables.
+
   /** Concatenate all the argument lists into a single list.
    *
    *  @param xss the lists that are to be concatenated