nzakas/eslint — pull request #40 by jamesallardice (2013-07-15 12:02:02+00:00)
Title: Rule: Warn on duplicate property identifiers

We should warn when an object literal contains more than one property with the same identifier:

```javascript
var x = {
a: 1,
a: 2
};
```

See http://jslinterrors.com/duplicate-key-a/