897021 - NORMAL "__proto__" property is not enumerable even if "enumerable" of it's descriptor is true

Status: RESOLVED DUPLICATE of bug 837630

(Core :: JavaScript Engine, defect)

Description

[teramako]

User Agent: Mozilla/5.0 (Windows NT 5.1; rv:22.0) Gecko/20100101 Firefox/22.0 (Beta/Release)
Build ID: 20130618035212

Steps to reproduce:

The following code works good:

```javascript
var obj = {};
Object.defineProperty(obj, "__proto__", { value: "nomal __proto__", enumerable: true});

for (var key in obj){ console.log(key); } // "__proto__" is written into the console
Object.keys(obj).length; // 1
```

But, on the other hand, it seems the following code doesn't works good:
```javascript
var obj = Object.create(null);
obj.__proto__ = "normal __proto__";

JSON.stringify(Object.getOwnPropertyDescriptor(obj, "__proto__"))
// {"configurable":true,"enumerable":true,"value":"normal __proto__","writable":true}

for (var key in obj) { console.log(key); } // nothing is written
Object.keys(obj).length; // 0
```

Why is not __proto__ property enumerated ?

And, I became aware that the following code works good:

Comment 1

[Masatoshi Kimura [:emk]]

> And, I became aware that the following code works good:

Where is "the following code"?

Comment 2

[teramako]

(In reply to Masatoshi Kimura [:emk] from comment #1)
> > And, I became aware that the following code works good:
> 
> Where is "the following code"?

oops orz, please ignore the paragraph.

Comment 3

[Claude Pache]

Should be marked as duplicate of Bug 837630