Microsoft/TypeScript — pull request #260 by JsonFreeman (2014-07-25 23:41:24+00:00)
Title: Disallow modifiers on export assignments

Very simple. We did not check for modifiers on an export assignment. I've added a specific error for this. For reference, the old compiler failed to parse in this case.

Example:
```TS
var x;
export export = x;
```

Fixes #164