ES6 symbols: turn symbols into a proper primitive type

src/d8.js

 // Copyright 2008 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 2196 matching lines @@
     return "*";
   switch (typeof x) {
     case "undefined":
       return "undefined";
     case "boolean":
     case "number":
     case "function":
       return x.toString();
     case "string":
       return "\"" + x.toString() + "\"";
-    // TODO(rossberg): add symbol case
+    case "symbol":
+      return "Symbol()";
     case "object":
       if (x === null) return "null";
       if (x.constructor && x.constructor.name === "Array") {
         var elems = [];
         for (var i = 0; i < x.length; ++i) {
           elems.push(
             {}.hasOwnProperty.call(x, i) ? Stringify(x[i], depth - 1) : "");
         }
         return "[" + elems.join(", ") + "]";
       }
@@ skipping 15 matching lines @@
         if ("set" in desc) {
           var setter = desc.set.toString();
           props.push("set " + name + setter.slice(setter.indexOf('(')));
         }
       }
       return "{" + props.join(", ") + "}";
     default:
       return "[crazy non-standard shit]";
   }
 }