From: ts <decoux@...>
Date: 2004-09-04T20:30:00+09:00
Subject: Re: Not just $SAFE, but damn $SAFE

>>>>> "A" == Aredridel  <aredridel@nbtsc.org> writes:

A> On Fri, 2004-09-03 at 17:08 +0900, ts wrote:

>> 1) if you use `case', you can trust the result (i.e. an object can't "lie")

A> Except that by using case, I can have an EvilString < String, for which
A> that returns true.

 We really don't use the same ruby

svg% cat b.rb
#!/usr/bin/ruby
class EvilString < String
end

obj = EvilString.new("hello")
res = case obj
      when String
         String.new(obj)
      else
         raise "EvilString"
      end
p res
svg% 

svg% b.rb
"hello"
svg% 



 `case' will call Module#===, try to modify it with $SAFE >= 4



Guy Decoux