elementAt throws a RangeError not StateError.

tests/lib/async/stream_controller_async_test.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Test the basic StreamController and StreamController.singleSubscription.
 library stream_controller_async_test;
 
 import 'dart:async';
 import 'dart:isolate';
 import "package:expect/expect.dart";
@@ skipping 228 matching lines @@
   test("elementAt", () {
     StreamController c = new StreamController();
     Future f = c.stream.elementAt(2);
     f.then(expectAsync1((v) { Expect.equals(13, v);}));
     sentEvents.replay(c);
   });
 
   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);
   });
 
   test("drain", () {
     StreamController c = new StreamController();
     Future f = c.stream.drain();
     f.then(expectAsync1((v) { Expect.equals(null, v);}));
     sentEvents.replay(c);
   });
 
@@ skipping 423 matching lines @@
   testRethrow();
   testBroadcastController();
   testAsBroadcast();
   testSink(sync: true, broadcast: false, asBroadcast: false);
   testSink(sync: true, broadcast: false, asBroadcast: true);
   testSink(sync: true, broadcast: true, asBroadcast: false);
   testSink(sync: false, broadcast: false, asBroadcast: false);
   testSink(sync: false, broadcast: false, asBroadcast: true);
   testSink(sync: false, broadcast: true, asBroadcast: false);
 }