[Bug?] Confused exception handling in Continuation Context

Hi all

I just went over some old Iterator code from the talk-list when I found some
very strange behavior concerning Exception when
using the iterator.

The below code loops inside the rescue clause, as a matter of fact it loops
between
      puts i.next
and
     puts "No more dudes"

I did not find any open bug report similar  to it.

I tried to isolate the behavior but could not reproduce it without the
callcc stuff.
I tested this with
* ruby 1.8.4 (2005-12-24) [i386-cygwin]
* ruby 1.8.4 (2005-12-24) [i686-linux]
* ruby 1.9.0 (2006-04-21) [i486-linux]

-------------------------------------------- 8<
-------------------------------------------------------------------

class Iterator
        class Exhausted < Exception; end
        def initialize( enum )
                @enum = enum
                @next = nil
        end

        def next
                return @next.call if @next
                @enum.each do
                        |item|
                        callcc{ |@next|
                                return item
                        }
                end # do
                raise Exception
        end # def next

        def reset
                @next = nil
        end
end # class Iterator

i = Iterator.new( %w{ Ringo John Paul George } )
begin
        loop do
                puts i.next
        end
rescue Exception
        puts "No more dudes"
end
#i.reset
puts i.next
--------------------------------------------------->8--------------------------------------------

Cheers
Robert