can't export unnamed functions

``` js
export function d () {}

// compiles to:
function d () {}
module.exports.d = d;
```

``` js
export function () {}
// throws
```

It also doesn't work on strings

``` js
export 'test'
```

if I have imported a module and then try to export it again it also throws an error:

``` js
import { set } from 'dex';

export set
// Unexpected end of input
```

But as you said the spec is still in flux so I guess it doesn't make sense to invest in those issues until the spec is somewhat finalized.