1 files changed, 19 insertions, 0 deletions
diff --git a/tests/run/t3822.scala b/tests/run/t3822.scala
new file mode 100644
index 000000000..c35804035
--- /dev/null
+++ b/tests/run/t3822.scala
@@ -0,0 +1,19 @@
+import scala.collection.{ mutable, immutable, generic }
+import immutable.ListSet
+
+object Test {
+  def main(args: Array[String]): Unit = {
+    val xs = ListSet(-100000 to 100001: _*)
+
+    assert(xs.size == 200002)
+    assert(xs.sum == 100001)
+
+    val ys = ListSet[Int]()
+    val ys1 = (1 to 12).grouped(3).foldLeft(ys)(_ ++ _)
+    val ys2 = (1 to 12).foldLeft(ys)(_ + _)
+
+    assert(ys1 == ys2)
+  }
+}
+
+