Tell me if this module is included by the same class more than once

included.rb

def self.included(base)
  base.instance_variable_set(:@count, 0) unless base.instance_variable_defined?(:@count)
  base.instance_variable_set(:@count, base.instance_variable_get(:@count) + 1)
  puts base.name if base.instance_variable_get(:@count) > 1
end