Not sure I understand that syntax... but now I'm getting an error:

```
==> Downloading http://selenium.googlecode.com/files/selenium-server-standalone-2.39.0.jar
Already downloaded: /Library/Caches/Homebrew/selenium-server-standalone-2.39.0.jar
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/fileutils.rb:338:in `symlink'
Errno::EEXIST: File exists - /usr/local/Cellar/selenium-server-standalone/2.39.0/bin/selenium-server-standalone or /usr/local/Cellar/selenium-server-standalone/2.39.0/bin/selenium-server-standalone
1. raise
2. ignore
3. backtrace
4. irb
5. shell
Choose an action: 3
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/fileutils.rb:338:in `symlink'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/fileutils.rb:338:in `ln_s'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/fileutils.rb:1418:in `fu_each_src_dest0'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/fileutils.rb:336:in `ln_s'
/usr/local/Library/Homebrew/extend/pathname.rb:89:in `install_symlink_p'
/usr/local/Library/Homebrew/extend/pathname.rb:77:in `install_symlink'
/usr/local/Library/Homebrew/extend/pathname.rb:70:in `each'
/usr/local/Library/Homebrew/extend/pathname.rb:70:in `install_symlink'
/usr/local/Library/Formula/selenium-server-standalone.rb:16:in `install'
/usr/local/Library/Homebrew/build.rb:165:in `install'
/usr/local/Library/Homebrew/formula.rb:272:in `brew'
/usr/local/Library/Homebrew/formula.rb:627:in `stage'
/usr/local/Library/Homebrew/resource.rb:63:in `unpack'
/usr/local/Library/Homebrew/extend/fileutils.rb:21:in `mktemp'
/usr/local/Library/Homebrew/resource.rb:60:in `unpack'
/usr/local/Library/Homebrew/resource.rb:53:in `stage'
(__FORWARDABLE__):3:in `__send__'
(__FORWARDABLE__):3:in `stage'
/usr/local/Library/Homebrew/formula.rb:625:in `stage'
/usr/local/Library/Homebrew/formula.rb:267:in `brew'
/usr/local/Library/Homebrew/build.rb:144:in `install'
/usr/local/Library/Homebrew/build.rb:45:in `main'
/usr/local/Library/Homebrew/build.rb:12
/usr/local/Library/Formula/selenium-server-standalone.rb:27
1. raise
2. ignore
3. backtrace
4. irb
5. shell
```

Any thoughts?