1 files changed, 31 insertions, 0 deletions
diff --git a/test/files/run/t6827.scala b/test/files/run/t6827.scala
new file mode 100644
index 0000000000..7e8918e3dc
--- /dev/null
+++ b/test/files/run/t6827.scala
@@ -0,0 +1,31 @@
+object Test extends App {
+  val ns = (0 until 20)
+  val arr = new Array[Int](10)
+
+  def tryit(label: String, start: Int, len: Int): Unit = {
+    val status = try {
+      val it = ns.toIterator
+      it.copyToArray(arr, start, len)
+      "ok"
+    } catch {
+      case e: Exception => e.toString
+    }
+    println("%s: %s" format (label, status))
+  }
+
+  tryit("start at -5", -5, 10)
+  tryit("start at -1", -1, 10)
+  tryit("start at limit", 10, 10)
+  tryit("start at limit-1", 9, 10)
+  tryit("first 10", 0, 10)
+  tryit("read all", 0, 20)
+  tryit("test huge len", 0, Int.MaxValue)
+  tryit("5 from 5", 5, 10)
+  tryit("20 from 5", 5, 20)
+  tryit("test len overflow", 5, Int.MaxValue)
+  tryit("start beyond limit", 30, 10)
+  tryit("read 0", 0, 0)
+  tryit("read -1", 0, -1)
+  tryit("invalid read 0", 30, 0)
+  tryit("invalid read -1", 30, -1)
+}