See:
http://www.reddit.com/r/vim/comments/2el2zo/til_expandshellvar_might_spawn_a_shell/
IFAIK, expand('$FOO') doesn't spawn shell in latest version of vim. So I think
it need to update doc.
https://gist.github.com/mattn/18c27561455271d17158
Thanks.
- Yasuhiro Matsumoto
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