The only structural type used in Scala library

Hi,
I just made a discovery that in trunk's Scala library there's one use of structural type. It's being used in implementation of Iterator.span (Iterator.scala:508).
I'm pretty sure that structural type in that place is not intended and is there only because type inference inferred structural type. Patch below fixes that problem. Would be great if someone could commit it. I can create a ticket if you prefer.
Also, I could send a pull request to Paul but I don't know if this is supported.
diff --git a/src/library/scala/collection/Iterator.scala b/src/library/scala/collection/Iterator.scala index c9f7500..afcd28f 100644--- a/src/library/scala/collection/Iterator.scala +++ b/src/library/scala/collection/Iterator.scala@@ -507,7 +507,14 @@ trait Iterator[+A] extends TraversableOnce[A] {     */   def span(p: A => Boolean): (Iterator[A], Iterator[A]) = {      val self = buffered-    val leading = new Iterator[A] { ++    /**+     * Giving a name to this iterator (as opposed to trailing) because +     * anonymous class is represented as a structural type that trailing+     * iterator is referring (the finish() method) and thus triggering +     * handling of structural calls. It's not what's intended here.+     */ +    class Leading extends Iterator[A] {       private var isDone = false        val lookahead = new mutable.Queue[A]       def advance() = { @@ -528,6 +535,7 @@ trait Iterator[+A] extends TraversableOnce[A] {         lookahead.dequeue()        }     }+    val leading = new Leading      val trailing = new Iterator[A] {       private lazy val it = {          leading.finish()