what's gonna happen?

refinements.rb

class Foo
  def yes
    puts "BORING"
  end
end

class Bar
  def self.go(x)
    puts x.yes
  end
end

module Refiner
  refine Foo do
    def yes
      puts "GOT IT!"
    end
  end
end

class Test
  using Refiner
  def self.execute
    puts Foo.new.yes
    Bar.go(Foo.new)
  end
end

Test.execute