1 files changed, 7 insertions, 1 deletions
diff --git a/src/library/scalax/collection/generic/covariant/IterableFactory.scala b/src/library/scalax/collection/generic/covariant/IterableFactory.scala
index 67445f54d9..0fd2284cea 100755
--- a/src/library/scalax/collection/generic/covariant/IterableFactory.scala
+++ b/src/library/scalax/collection/generic/covariant/IterableFactory.scala
@@ -7,8 +7,14 @@ trait IterableFactory[CC[+A] <: Iterable[A]] extends generic.IterableFactory[CC]
 
   override protected def newBuilder[A]: Builder[CC, A] =
     empty.newBuilder[A].asInstanceOf[Builder[CC, A]]
+     // the cast here is unavoidable because CC is not constrained with covariant.IterableTemplate[CC, A]
+     // It's can't be constrained because some suntype links between covariant and generic Templates
+     // are missing. That's a consequence of our hacks to have both nonvariant and covariant templates.
 
   /** Create CC collection of specified elements */
   override def apply[A](args: A*): CC[A] =
-    (empty ++ args.asInstanceOf[Iterable[A]]).asInstanceOf[CC[A]] // !!!
+    (empty ++ args.asInstanceOf[Iterable[A]]).asInstanceOf[CC[A]]
+     // the cast here is unavoidable because CC is not constrained with covariant.IterableTemplate[CC, A]
+     // It's can't be constrained because some suntype links between covariant and generic Templates
+     // are missing. That's a consequence of our hacks to have both nonvariant and covariant templates.
 }