nested ruby object initialization in module

nested_object_initialization_in_module.rb

module MA
  class B
    attr_accessor :var_1, :var_2
    def initialize
      @var_1 = "initialized"
      @var_2 = "initialized"
    end 
  end 
end

class A
  def test
    b = MA::B.new
    puts "B's instance variables: #{b.instance_variables}"
    puts "B: #{b.inspect}"
    b.var_1 = "re_initialized"
    b.var_2 = "re_initialized"

    puts "B: #{b.inspect}"
  end 
end

a = A.new
a.test

=> B's instance variables: @var_2@var_1
=> B: #<MA::B:0x26afc @var_2="initialized", @var_1="initialized">
=> B: #<MA::B:0x26afc @var_2="re_initialized", @var_1="re_initialized">