Improving error messages when adding properties to non JSObject receiver in

test/mjsunit/harmony/super.js

Index: test/mjsunit/harmony/super.js
diff --git a/test/mjsunit/harmony/super.js b/test/mjsunit/harmony/super.js
index 9242dd51b815366b6aafb2f28e8d3602fbfad67d..651f3dca3f2da6617ad774815d61b9cc941d4a90 100644
--- a/test/mjsunit/harmony/super.js
+++ b/test/mjsunit/harmony/super.js
@@ -1076,7 +1076,7 @@
       }
       assertInstanceof(ex, TypeError);
       assertEquals(
-          "Cannot assign to read only property 'ownReadOnly' of #<Base>",
+          "Cannot assign to read only property 'ownReadOnly' of object '#<Base>'",
           ex.message);
       assertEquals(42, this.ownReadOnly);
 
@@ -1323,7 +1323,7 @@ function TestKeyedSetterCreatingOwnPropertiesNonConfigurable(
       assertInstanceof(ex, TypeError);
       assertEquals(
           "Cannot assign to read only property '" + ownReadOnly +
-              "' of #<Base>",
+              "' of object '#<Base>'",
           ex.message);
       assertEquals(42, this[ownReadOnly]);