# File lib/virtus/module_extensions.rb, line 16
    def self.setup(mod, inclusions = [Model], attribute_definitions = [])
      mod.instance_variable_set('@inclusions', inclusions)
      existing_attributes = mod.instance_variable_get('@attribute_definitions')
      new_attributes = (existing_attributes || []) + attribute_definitions
      mod.instance_variable_set('@attribute_definitions', new_attributes)
    end