Arguments object has @@iterator

src/array-iterator.js

Index: src/array-iterator.js
diff --git a/src/array-iterator.js b/src/array-iterator.js
index 9511b6d95a483c6f56395dd5701a0325c530477d..5508e950434064a515a60ec8068badb7bd1fe910 100644
--- a/src/array-iterator.js
+++ b/src/array-iterator.js
@@ -126,3 +126,34 @@ function ExtendArrayPrototype() {
   ));
 }
 ExtendArrayPrototype();
+
+
+function ArgumentsIteratorGetter() {
+  return ArrayValues;
+}
+
+
+function ArgumentsIteratorSetter(val) {
+  ObjectDefineProperty(this, symbolIterator, {
+    value: val,
+    writable: true,
+    enumerable: false,
+    configurable: true
+  });
+}
+
+
+function ExtendArgumentsBoilerplateObjects() {
+  %CheckIsBootstrapping();
+
+  for (var i = 0; i < 3; i++) {
+    var boilerplate = %GetArgumentsBoilerplateObject(i);
+    ObjectDefineProperty(boilerplate, symbolIterator, {
+      get: ArgumentsIteratorGetter,

[arv (Not doing code reviews), 2014/06/25 15:55:05]

It is not clear to me why this cannot be a data property?

With the current code, what does the descriptor look like for?

Object.getOwnPropertyDescriptor(arguments, Symbol.iterator)

+      set: ArgumentsIteratorSetter,
+      enumerable: false,
+      configurable: true
+    });
+  }
+}
+ExtendArgumentsBoilerplateObjects();