3 files changed, 49 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.
diff --git a/test/files/run/t4535.check b/test/files/run/t4535.check
new file mode 100644
index 0000000000..9d4ce0d535
--- /dev/null
+++ b/test/files/run/t4535.check
@@ -0,0 +1,3 @@
+ArrayStack(1, 2, 3)
+ArrayStack(1, 2, 3, 4, 5, 6)
+ArrayStack(6, 5, 4, 3, 2, 1)
+\ No newline at end of file
diff --git a/test/files/run/t4535.scala b/test/files/run/t4535.scala
new file mode 100644
index 0000000000..91c13a28cd
--- /dev/null
+++ b/test/files/run/t4535.scala
@@ -0,0 +1,30 @@
+
+
+import collection._
+
+
+// #4535
+object Test {
+
+  def main(args: Array[String]) {
+    val as = new mutable.ArrayStack[Int]
+    as push 1
+    as push 2
+    as push 3
+    println(as.reverse)
+
+    as push 4
+    as push 5
+    as push 6
+    println(as.reverse)
+
+    println(as map { x => x })
+
+    for (i <- 0 until 100) {
+      as push i
+      assert(as == as.map(x => x))
+      assert(as == as.reverse.reverse)
+    }
+  }
+
+}