Migrated test block 13 to Dart 2.0.

tests/corelib/list_index_of2_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.
-
-import "package:expect/expect.dart";
-
-class A {
-  const A();
-}
-
-class B extends A {
-  const B();
-}
-
-void test(List<B> list) {
-  // Test that the list accepts a different type for indexOf.
-  //   List<B>.indexOf(A)
-  Expect.equals(-1, list.indexOf(const A()));
-  Expect.equals(-1, list.lastIndexOf(const A()));
-}
-
-main() {
-  var list = new List<B>(1);
-  list[0] = const B();
-  test(list);
-  var list2 = new List<B>();
-  list2.add(const B());
-  test(list2);
-  test(<B>[const B()]);
-  test(const <B>[]);
-  test(<B>[const B()].toList());
-}