Implement ES6 Array.prototype.toString behind --harmony-tostring

src/harmony-tostring.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 "use strict";
 
 // This file relies on the fact that the following declaration has been made
 // in runtime.js and symbol.js:
 // var $Object = global.Object;
 // var $Symbol = global.Symbol;
@@ skipping 15 matching lines @@
 // ES6 draft 08-24-14, section 19.1.3.6
 function ObjectToStringHarmony() {
   if (IS_UNDEFINED(this) && !IS_UNDETECTABLE(this)) return "[object Undefined]";
   if (IS_NULL(this)) return "[object Null]";
   var O = ToObject(this);
   var builtinTag = %_ClassOf(O);
   var tag = O[symbolToStringTag];
   if (IS_UNDEFINED(tag)) {
     tag = builtinTag;
   } else if (!IS_STRING(tag)) {
-    return "[object ???]"
+    return "[object ???]";
   } else if (tag !== builtinTag && kBuiltinStringTags[tag]) {
     return "[object ~" + tag + "]";
   }
   return "[object " + tag + "]";
 }
 
 function HarmonyToStringExtendSymbolPrototype() {
   %CheckIsBootstrapping();
 
   InstallConstants($Symbol, $Array(
@@ skipping 16 matching lines @@
   // Set up the non-enumerable functions on the Array prototype object.
   var desc = ToPropertyDescriptor({
     value: ObjectToStringHarmony
   });
   DefineOwnProperty($Object.prototype, "toString", desc, false);
 
   %ToFastProperties($Object.prototype);
 }
 
 HarmonyToStringExtendObjectPrototype();