The partest hangs are back in force.

down the long and freezy road once again. With this patch you can send a
SIGHUP to partest and it will spew a bunch of internal state. It is also
possible I fixed the underlying issue by cleaning up the super fragile
dependence on counters never getting the least bit off track. If fixed,
it'll still be fun to send signals. If not, this will be coming in handy
reeeeeal soon. No review.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/library/scala/collection/Iterator.scala b/src/library/scala/collection/Iterator.scala
index 40f8bc7f81..b741834cf1 100644
--- a/src/library/scala/collection/Iterator.scala
+++ b/src/library/scala/collection/Iterator.scala
@@ -757,7 +757,7 @@ trait Iterator[+A] extends TraversableOnce[A] {
    *  Typical uses can be achieved via methods `grouped' and `sliding'.
    */
   class GroupedIterator[B >: A](self: Iterator[A], size: Int, step: Int) extends Iterator[Seq[B]] {
-    require(size >= 1 && step >= 1)
+    require(size >= 1 && step >= 1, "size=%d and step=%d, but both must be positive".format(size, step))
 
     private[this] var buffer: ArrayBuffer[B] = ArrayBuffer()  // the buffer
     private[this] var filled = false                          // whether the buffer is "hot"