Add tests for generic methods in strong mode

tests/language_strong/generic_methods_closure_test.dart

Index: tests/language_strong/generic_methods_closure_test.dart
diff --git a/tests/language_strong/generic_methods_closure_test.dart b/tests/language_strong/generic_methods_closure_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..131105dc8356866580bdc8cf1c09f2a33d2e5c45
--- /dev/null
+++ b/tests/language_strong/generic_methods_closure_test.dart
@@ -0,0 +1,41 @@
+// 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 a generic closure is correctly constructed.
+
+library generic_methods_closure_test;
+
+import "package:expect/expect.dart";
+
+class A {}
+
+class I<T> {}
+
+class B extends I<B> {}
+
+void fun<T>(List<T> list) {
+  var helper1 = <S>(List<S> list) {
+    if (list.length > 0) {
+      Expect.isTrue(list[0] is S);
+    }
+    Expect.isTrue(list is List<S>);
+    Expect.isTrue(list is List<T>);
+  };
+
+  void helper2<S>(List<S> list) {
+    if (list.length > 0) {
+      Expect.isTrue(list[0] is S);
+    }
+    Expect.isTrue(list is List<S>);
+    Expect.isTrue(list is List<T>);
+  }
+
+  helper1<T>(list);
+  helper2<T>(list);
+}
+
+main() {
+  List<B> list = <B>[new B()];
+  fun<B>(list);
+}