Add tests for generic methods in strong mode

tests/language_strong/generic_methods_shadowing_test.dart

Index: tests/language_strong/generic_methods_shadowing_test.dart
diff --git a/tests/language_strong/generic_methods_shadowing_test.dart b/tests/language_strong/generic_methods_shadowing_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..a677fd4f88cdf70e73d9f553350a99d23c0b6c9e
--- /dev/null
+++ b/tests/language_strong/generic_methods_shadowing_test.dart
@@ -0,0 +1,27 @@
+// 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()));
+}