elementAt throws a RangeError not StateError.

tests/lib/async/stream_controller_async_test.dart

Index: tests/lib/async/stream_controller_async_test.dart
diff --git a/tests/lib/async/stream_controller_async_test.dart b/tests/lib/async/stream_controller_async_test.dart
index 0cae4fafd237831af50d8715c27d4744920f0028..2bfb4f016e07f049e03244eee18b9ac0331f18fc 100644
--- a/tests/lib/async/stream_controller_async_test.dart
+++ b/tests/lib/async/stream_controller_async_test.dart
@@ -246,7 +246,7 @@ testExtraMethods() {
   test("elementAt 2", () {
     StreamController c = new StreamController();
     Future f = c.stream.elementAt(20);
-    f.catchError(expectAsync1((error) { Expect.isTrue(error is StateError); }));
+    f.catchError(expectAsync1((error) { Expect.isTrue(error is RangeError); }));
     sentEvents.replay(c);
   });