conflict.rb

module M1
  def nyan1
    run_callback(->(*args){ args.join }, '1', '2', '3')
  end

  private
 
  def run_callback(callback, *args)
    callback.(*args)
  end
end

module M2
  def nyan2
   run_callback
  end

  private

  def run_callback
    
  end
end

class A
  include M1
  include M2
end

p A.new.nyan2 #=> nil
p A.new.nyan1 #=> `run_callback': wrong number of arguments (4 for 0) (ArgumentError)