Big problem with debian ruby 1.8.0-1

Hello,

I have just upgraded ruby on my debian unstable to ruby 1.8.0-1
(2003-10-05), and my program has crashed. Here is the stripped down
version of my code:

----------------------------------------------------------------------
#!/usr/bin/ruby1.8

class Action < Proc
  attr_accessor :name
  def initialize
    puts "Action#init"
    @name='not defined'
    super
  end
end

class Actions
  def initialize
    @actions=Hash.new
  end
  
  #~ def register(name,action=nil)
  def register(name,action=nil,&bl)
    if action.nil? && block_given?
      puts "Before Action.new"
      action=Action.new(&bl)
      #~ action=Action.new
      puts "After Action.new"
    end
    puts action.inspect
    action.name=name
    @actions[name]=action
    action
  end
end

actions=Actions.new
actions.register('exit') {puts "yes"}
----------------------------------------------------------------------

This program now outputs the following:

fery@domesticus:~/work/tudomany/implementation$ ./gui_test.rb
Before Action.new
After Action.new
#<Proc:0x40276854@./gui_test.rb:32>
../gui_test.rb:25:in `register': undefined method `name=' for
#<Proc:0x40276854@./gui_test.rb:32> (NoMethodError)
        from ./gui_test.rb:32
fery@domesticus:~/work/tudomany/implementation$


So, instead of Action, action is a Proc! :-O

Note, if I remove the &bl from the Actions#register(), then this code do
not show this behavior, although, there is not so much sense using a
Proc-derived class without a proc... :-((

What is the problem?

Thanks:
Ferenc

PS: The previous ruby version was also 1.8.0 (I do not remember the
exact date). :(