Make new Harmony constructors subclassing-friendly

test/mjsunit/harmony/collections.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 286 matching lines @@
     enumerable: false,
     configurable: false
   }, Object.getOwnPropertyDescriptor(C, "prototype"));
 }
 TestPrototype(Set);
 TestPrototype(Map);
 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);
   assertSame(C, C.prototype.constructor);
   assertSame(C, (new C).__proto__.constructor);
 }
 TestConstructor(Set);
 TestConstructor(Map);
 TestConstructor(WeakMap);
 TestConstructor(WeakSet);
@@ skipping 159 matching lines @@
 
 
 // Test WeakSet clear
 (function() {
   var k = new Object();
   var w = new WeakSet();
   w.add(k);
   assertTrue(w.has(k));
   w.clear();
   assertFalse(w.has(k));
-})();
+})();