Fix ArrayStack.growArray at boundary.

Doubling a 0-size array is still 0, that's not growing. Closes SI-4963,
no review.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/library/scala/collection/mutable/ArrayStack.scala b/src/library/scala/collection/mutable/ArrayStack.scala
index 1cb44e55d5..d33ca03fbe 100644
--- a/src/library/scala/collection/mutable/ArrayStack.scala
+++ b/src/library/scala/collection/mutable/ArrayStack.scala
@@ -28,7 +28,7 @@ object ArrayStack extends SeqFactory[ArrayStack] {
   }
 
   private[mutable] def growArray(x: Array[AnyRef]) = {
-    val y = new Array[AnyRef](x.length * 2)
+    val y = new Array[AnyRef](math.max(x.length * 2, 1))
     Array.copy(x, 0, y, 0, x.length)
     y
   }