Make new Harmony constructors subclassing-friendly

test/mjsunit/harmony/collections.js

Index: test/mjsunit/harmony/collections.js
diff --git a/test/mjsunit/harmony/collections.js b/test/mjsunit/harmony/collections.js
index 174d3d1dc7ca772c86e388e8de68f786b9022e08..a3d1ca8f26566422da120374330c03ede82781e2 100644
--- a/test/mjsunit/harmony/collections.js
+++ b/test/mjsunit/harmony/collections.js
@@ -304,6 +304,20 @@ TestPrototype(WeakMap);
 TestPrototype(WeakSet);
 
 
+// Test that constructor can be called only on appropriate objects only once.
+function TestConstructorBehavior(C) {
+  var obj = new C();
+  assertThrows(function() { C.call(obj); }, TypeError);
+  assertThrows(function() { C.call({}); }, TypeError);
+  var uninitObj = %NewObject(C);
+  C.call(uninitObj); // shouldn't throw
+}
+TestConstructorBehavior(Set);
+TestConstructorBehavior(Map);
+TestConstructorBehavior(WeakMap);
+TestConstructorBehavior(WeakSet);
+
+
 // Test constructor property of the Set, Map, WeakMap and WeakSet prototype.
 function TestConstructor(C) {
   assertFalse(C === Object.prototype.constructor);
@@ -483,4 +497,4 @@ for (var i = 9; i >= 0; i--) {
   assertTrue(w.has(k));
   w.clear();
   assertFalse(w.has(k));
-})();
+})();