Segmentation fault on trailing_comma with Swift 2.3

Currently exiting with code 139 on lint.

```
2016-12-01 22:06:49.888 swiftlint[87645:2364960] *** -[__NSCFString substringWithRange:]: Range {2127, 18446744073709551614} out of bounds; string length 3640. This will become an exception for apps linked after 10.10 and iOS 8. Warning shown once per app execution.
```