matz	2007-12-21 14:59:20 +0900 (Fri, 21 Dec 2007)

  New Revision: 14404

  Modified files:
    trunk/ChangeLog
    trunk/enumerator.c

  Log:
    * enumerator.c (enumerator_init_copy): prohibit cloning of
      generators since Fibers cannot be copied.

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/ChangeLog?r1=14404&r2=14403
  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/enumerator.c?r1=14404&r2=14403