ES6 symbols: implement name property

test/mjsunit/harmony/symbols.js

 // Copyright 2013 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 19 matching lines @@
 
 var symbols = []
 
 // Test different forms of constructor calls, all equivalent.
 function TestNew() {
   function IndirectSymbol() { return new Symbol }
   function indirect() { return new IndirectSymbol() }
   for (var i = 0; i < 2; ++i) {
     for (var j = 0; j < 5; ++j) {
       symbols.push(Symbol())
+      symbols.push(Symbol(undefined))
+      symbols.push(Symbol("66"))
+      symbols.push(Symbol(66))
       symbols.push(Symbol(Symbol()))
       symbols.push((new Symbol).valueOf())
       symbols.push((new Symbol()).valueOf())
       symbols.push((new Symbol(Symbol())).valueOf())
       symbols.push(Object(Symbol()).valueOf())
       symbols.push((indirect()).valueOf())
     }
     %OptimizeFunctionOnNextCall(indirect)
     indirect()  // Call once before GC throws away type feedback.
     gc()        // Promote existing symbols and then allocate some more.
   }
 }
 TestNew()
 
 
 function TestType() {
   for (var i in symbols) {
     assertEquals("symbol", typeof symbols[i])
     assertTrue(typeof symbols[i] === "symbol")
     assertEquals(null, %_ClassOf(symbols[i]))
     assertEquals("Symbol", %_ClassOf(new Symbol(symbols[i])))
     assertEquals("Symbol", %_ClassOf(Object(symbols[i])))
   }
 }
 TestType()
 
 
+function TestName() {
+  for (var i in symbols) {
+    var name = symbols[i].name
+    assertTrue(name === undefined || name === "66")
+  }
+}
+TestName()
+
+
 function TestToString() {
   for (var i in symbols) {
     assertThrows(function() { String(symbols[i]) }, TypeError)
     assertThrows(function() { symbols[i] + "" }, TypeError)
     assertThrows(function() { symbols[i].toString() }, TypeError)
     assertThrows(function() { (new Symbol(symbols[i])).toString() }, TypeError)
     assertThrows(function() { Object(symbols[i]).toString() }, TypeError)
     assertEquals("[object Symbol]", Object.prototype.toString.call(symbols[i]))
   }
 }
@@ skipping 197 matching lines @@
   var obj = objs[i]
   TestKeySet(obj)
   TestKeyDefine(obj)
   TestKeyGet(obj)
   TestKeyHas(obj)
   TestKeyEnum(obj)
   TestKeyNames(obj)
   TestKeyDescriptor(obj)
   TestKeyDelete(obj)
 }