Add test for checked setters of generic types.

tests/language/checked_setter2_test.dart

Index: tests/language/checked_setter2_test.dart
diff --git a/tests/language/checked_setter_test.dart b/tests/language/checked_setter2_test.dart
similarity index 72%
copy from tests/language/checked_setter_test.dart
copy to tests/language/checked_setter2_test.dart
index 608a472f9c8dc27855c6bfa9650b6cfcec970635..370c8d0213b47378b971972cd4be648e273ae6fc 100644
--- a/tests/language/checked_setter_test.dart
+++ b/tests/language/checked_setter2_test.dart
@@ -2,18 +2,18 @@
 // 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 implicit setters in checked mode do a type check.
+// Test that implicit setters in checked mode do a type check generic types.
 
 import "package:expect/expect.dart";
 
 class A {
-  C c;
+  C<int> c;
 }
 
 class B extends A {
 }
 
-class C {
+class C<T> {
 }
 
 var array = [new B()];
@@ -27,6 +27,6 @@ main() {
     inCheckedMode = true;
   }
   if (inCheckedMode) {
-    Expect.throws(() => array[0].c = new B(), (e) => e is TypeError);
+    Expect.throws(() => array[0].c = new C<bool>(), (e) => e is TypeError);
   }
-}
+}