Migrate block 114 (and some of 113).

tests/language_strong/generic_methods_shadowing_test.dart

-// Copyright (c) 2017, 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 that type parameters in generic methods can be shadowed.
-
-library generic_methods_shadowing_test;
-
-import "package:expect/expect.dart";
-
-class X {}
-
-class Y {}
-
-bool foo<T, S>(T t, S s) {
-  // The type parameter T of bar shadows the type parameter T of foo.
-  bool bar<T>(T t) {
-    return t is T && t is S;
-  }
-
-  return bar<S>(s);
-}
-
-main() {
-  Expect.isTrue(foo<X, Y>(new X(), new Y()));
-}