Arguments object has @@iterator

src/runtime.cc

 // Copyright 2012 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.
 
 #include <stdlib.h>
 #include <limits>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 5993 matching lines @@
 
   // Try to convert the key to an index. If successful and within
   // index return the the argument from the frame.
   uint32_t index;
   if (raw_key->ToArrayIndex(&index) && index < n) {
     return frame->GetParameter(index);
   }
 
   HandleScope scope(isolate);
   if (raw_key->IsSymbol()) {
+    Handle<Symbol> symbol = Handle<Symbol>::cast(raw_key);
+    if (symbol->Equals(isolate->native_context()->iterator_symbol())) {
+      return isolate->native_context()->array_values_iterator();
+    }
     // Lookup in the initial Object.prototype object.
     Handle<Object> result;
     ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
         isolate, result,
         Object::GetProperty(isolate->initial_object_prototype(),
                             Handle<Symbol>::cast(raw_key)));
     return *result;
   }
 
   // Convert the key to a string.
@@ skipping 9622 matching lines @@
   }
   return NULL;
 }
 
 
 const Runtime::Function* Runtime::FunctionForId(Runtime::FunctionId id) {
   return &(kIntrinsicFunctions[static_cast<int>(id)]);
 }
 
 } }  // namespace v8::internal