Static methods and modules

output.sh

> ruby statics.rb
4
statics.rb:12:in `<main>': undefined method `non_static' for Foo:Module (NoMethodError)

statics.rb

module Foo
  def non_static(x)
    x * x
  end

  def self.static(x)
    x * x
  end
end

puts Foo.static(2)
puts Foo.non_static(4)

I think this is how it's done: http://blog.bigbinary.com/2012/06/28/extend-self-in-ruby.html