$:.unshift File.expand_path("../../lib", __FILE__)
require "signal"

class Contact
  include Signal

  attr_reader :name, :email

  def initialize(name, email)
    @name, @email = name, email
  end

  def output!
    emit(:output)
  end
end

contact = Contact.new("John Doe", "john@example.org")
contact.on(:output) { puts name, email }
contact.output!