Example of private module methods overwriting each other when mixed in

module_test.rb

module MyFirstModule
  def first_public_method(my_string)
    return "#{my_string} #{private_method}"
  end
  private
  def private_method
    1
  end
end

module MySecondModule
  def second_public_method(my_string)
    return "#{my_string} #{private_method}"
  end

  private
  def private_method
    2
  end
end

class MyClass
  include MyFirstModule
  include MySecondModule
end

puts MyClass.new.first_public_method("hey") # => "hey 2"
puts MyClass.new.second_public_method("hey") # => "hey 2"