concern.rb

module Accessible
  def self.included(base)
    puts base.respond_to?(:accessible?)
  end
end

class My
  include Accessible

  def self.accessible?
    true
  end
end

module Accessible
  def self.included(base)
    puts base.respond_to?(:accessible?)
  end
end

class My
  include Accessible

  def accessible?
    true
  end
end # => true