如何在特征类中使模块常量也可见？

我创建了一个包含常量NAME和方法的模块hello.如果类包含模块,则两个定义应在不同范围内可见.

module A
  NAME = 'Otto'
  def self.included(base)
    base.extend(ClassMethods)
  end

  def hello(name = 'world')
    self.class.hello(name)
  end

  module ClassMethods
    def hello(name = 'world')
      "Hello #{name}!"
    end
  end
end

class B
  include A

  def instance_scope
    p [__method__, hello(NAME)]
  end

  def self.class_scope
    p [__method__, hello(NAME)]
  end

  class << self
    def eigen_scope
      p [__method__, hello(NAME)]
    end
  end
end

B.new.instance_scope
B.class_scope
B.eigen_scope

#=> script.rb:34:in `eigen_scope': uninitialized constant Class::NAME (NameError)
    from script.rb:41

但是常量在本征类的实例方法范围中是不可见的class << self.

有没有办法使模块更健壮,并在上面的错误范围内提供常量？