Fixes and closes #4535.

No review.

1 files changed, 16 insertions, 1 deletions

diff --git a/src/library/scala/collection/mutable/ArrayStack.scala b/src/library/scala/collection/mutable/ArrayStack.scala
index 012105d7c4..b39aff2463 100644
--- a/src/library/scala/collection/mutable/ArrayStack.scala
+++ b/src/library/scala/collection/mutable/ArrayStack.scala
@@ -169,7 +169,22 @@ extends Seq[T]
    */
   def +=(x: T): this.type = { push(x); this }
 
-  def result = new ArrayStack[T](table.reverse, index)
+  def result = {
+    reverseTable()
+    this
+  }
+
+  private def reverseTable() {
+    var i = 0
+    val until = index / 2
+    while (i < until) {
+      val revi = index - i - 1
+      val tmp = table(i)
+      table(i) = table(revi)
+      table(revi) = tmp
+      i += 1
+    }
+  }
 
   /** Pop the top two elements off the stack, apply `f` to them and push the result
    *  back on to the stack.