On Mon, Oct 06, 2008 at 10:46:49AM +0900, Nobuyoshi Nakada wrote: > No. I'd implemented and tested it once but found it's just > problematic rather than useful. For instance, how do you > consider about instance variables? Instance_eval for initialization has surprising behavior for instance variables (e.g. as in Ruby/Tk). A method that affects only method calls and not instance variables would make this idiom more viable. I don't know whether that is a good thing or a bad thing. Paul