From: pjb@... (Pascal J. Bourguignon)
Date: 2008-11-07T02:18:12+09:00
Subject: Re: Redefine while

Emil Sandin <esandin@gmail.com> writes:

> Jason Roelofs wrote:
>> On Thu, Nov 6, 2008 at 10:00 AM, Emil Sandin <esandin@gmail.com> wrote:
>>>  yield if condition
>>> --
>>> Posted via http://www.ruby-forum.com/.
>>>
>>>
>> 
>> Not possible. 'while' is a keyword, not a method.
>> 
>> Jason
>
> Too bad. I thought you could do anything with ruby ;)

No.  You'd need a non-broken lisp to do that.

In Common Lisp:

(shadow 'while)
(defmacro while (condition &body body)
   `(progn
       (format t "In redefined while~%")
       (when ,condition 
         ,@body)))

(while t
  'hi)
In redefined while
HI

-- 
__Pascal Bourguignon__