1 files changed, 11 insertions, 0 deletions
diff --git a/tests/run/adding-growing-set.scala b/tests/run/adding-growing-set.scala
new file mode 100644
index 000000000..ab94b893b
--- /dev/null
+++ b/tests/run/adding-growing-set.scala
@@ -0,0 +1,11 @@
+/** This will run a loooong time if Set's builder copies a
+ *  complete new Set for every element.
+ */
+object Test {
+  def main(args: Array[String]): Unit = {
+    val a = new Array[Long](1000000)
+    (1 to 10000) foreach (i => a(i) = i)
+    val s = collection.mutable.Set(a: _*)
+    assert(s.sum > 0)
+  }
+}