Danger of accessing constant name during inheritance

anonymous_class.rb

# This illustrates the danger of accessing the constant name
# of a child class during inheritance (ex by to_s).  The
# constant name will not be set at the time of inheritance
# if the class was is using Class.new.

class A
  class << self
    attr_accessor :const_name

    def inherited(child)
      child.const_name = child.to_s
    end
  end
end

class B < A; end
puts B.const_name          # => B

C = Class.new(A)
puts C.const_name          # => #<Class:...>