gistfile1.txt

class Logger
  def self.logger
    @logger ||= object_id
  end

  def message(m)
    puts m
  end

  module Stuff
    def logmsg(m)
      logger.message(m)
    end
  end
end

class Test0
  include Logger::Stuff

  attr_accessor :log

  def initialize(logger: Logger.new)
    log = logger
  end