module ActiveSupport::Concern

def append_features(base)
  if base.instance_variable_defined?("@_dependencies")
    base.instance_variable_get("@_dependencies") << self
    return false
  else
    return false if base < self
    @_dependencies.each { |dep| base.send(:include, dep) }
    super
    base.extend const_get("ClassMethods") if const_defined?("ClassMethods")
    if const_defined?("InstanceMethods")
      base.send :include, const_get("InstanceMethods")
      ActiveSupport::Deprecation.warn "The InstanceMethods module inside ActiveSupport::Concern will be " \
        "no longer included automatically. Please define instance methods directly in #{self} instead.", caller
    end
    base.class_eval(&@_included_block) if instance_variable_defined?("@_included_block")
  end
end