neovim/neovim — pull request #653 by mhinz (2014-04-29 20:37:25+00:00)
Title: [RFC] vim-patch:7.4.272

```
Problem: Using just "$" does not cause an error message.
Solution: Check for empty environment variable name.
(Christian Brabandt)
```

https://code.google.com/p/vim/source/detail?r=00228400629e28384f7f52556c3c119ba0d0a44d