From: "Marcin Mielżyński" <lopx@...>
Date: 2006-07-14T07:45:07+09:00
Subject: Re: challenge

ara.t.howard@noaa.gov wrote:

> wow.  learn something every day!
> 
>   ~ > cat a.rb
>   class File
>     def File.open(*a) 42 end
>   end
> 
>   p File.open(__FILE__)
> 
>   class << File; self; end.class_eval do
>     remove_method :open
>   end
> 
>   p File.open(__FILE__)
> 
> 
> 
>   ~ > ruby a.rb
>   42
>   #<File:a.rb>
> 
> 
> i wasn't aware remove_method had this 'stacklike' quality.
> 

The open method is in fact defined in IO class which is extended by File 
class. In your case another method for File eigenclass class was defined

lopex