[ruby-talk:01009] Reparenting a block

Another block question. Is there any way to re-parent a Proc? For
example

   class Dave
      def initialize(&block)
         ??
      end

      def fred
         print "In fred\n"
      end
   end


   Dave.new {
      fred
   }


Is there a magic incantation at the '??'s above which would cause the
block containing the call to 'fred' to be evaluated with self set to
the object created by Dave.new? I've tried instance_eval, but I don't
seem to be able to get it so work with a variable containing a block.


Thanks

Dave