1 files changed, 17 insertions, 0 deletions
diff --git a/tests/run/t3989.scala b/tests/run/t3989.scala
new file mode 100644
index 000000000..896283f19
--- /dev/null
+++ b/tests/run/t3989.scala
@@ -0,0 +1,17 @@
+
+
+
+
+
+class Foo{ override def equals(o: Any) = false; override def hashCode = 1}
+
+// should not result in a stack overflow
+object Test {
+  def main(args: Array[String]): Unit = {
+    import collection.immutable.HashMap
+    var m = Map[Foo, Int]()
+    for (i <- 1 to 30000) m += (new Foo) -> i
+    assert(m.size == 30000)
+    m.toString
+  }
+}