Destructuring with single-line 'for' fails

This parses:

``` moon
for {:file, :args} in *options.runFiles
  runFile file, args 
```

But this doesn't:

``` moon
runFile file, args for {:file, :args} in *options.runFiles
```

```
Failed to parse:
 [107] >>    runFile file, args for {:file, :args} in *options.runFiles
```
