fix #552, Object members on native types

test/codegen/corelib/type_hashcode_test.dart

Index: test/codegen/corelib/type_hashcode_test.dart
diff --git a/test/codegen/corelib/type_hashcode_test.dart b/test/codegen/corelib/type_hashcode_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..49c9ab8f97cbe62008fea16d60dfbdbe0c4149bc
--- /dev/null
+++ b/test/codegen/corelib/type_hashcode_test.dart
@@ -0,0 +1,11 @@
+import "package:expect/expect.dart";
+
+void main() {
+  var h = "hello", w = "world";
+  Expect.notEquals(h.hashCode, w.hashCode);
+  Expect.notEquals((String).hashCode, (int).hashCode);
+  var c = h.runtimeType.hashCode;
+  Expect.isTrue(c is int);
+  Expect.notEquals(c, null);
+  Expect.notEquals(c, 0);
+}