power_p About Extend Kernel#p with power_assert. Note that power_p works only if p is written in the file. $ cat test.rb p { 3.times.to_a } $ ruby -rpower_p test.rb p { 3.times.to_a } | | | [0, 1, 2] #<Enumerator: 3:times> Travis Build Status <img src=“https://secure.travis-ci.org/k-tsj/power_p.png”/>