From: Philip Mak <mfraser@...>
Date: 2002-10-15T20:50:12+09:00
Subject: How to undefine a method on the fly?

Suppose I have this:

class Hello
    def hi
        puts "Hi"
    end
end
x = Hello.new

Is it possible to modify the object x so that its "hi" method no longer
works, without affecting the Hello class itself? I read about
"remove_method" and "undef_method" in ri, but I can't figure out how to
target them at a specific object.