To install bench using this formula use:
`brew install bench.rb`
To install bench with full output:
`brew install --verbose --debug bench.rb`
Useful links:
* [Formula Cookbook](https://github.com/Homebrew/homebrew/blob/master/share/doc/homebrew/Formula-Cookbook.md)
* [Homebrew python documentation](https://github.com/Homebrew/homebrew/blob/master/share/doc/homebrew/Python-for-Formula-Authors.md)