From: Ken Bloom <kbloom@...>
Date: 2008-12-06T01:32:12+09:00
Subject: [ruby-core:20378] Re: Behavior: autoload calls rb_require() directly

On Thu, 04 Dec 2008 16:51:10 +0900, Yukihiro Matsumoto wrote:

> Hi,
> 
> In message "Re: [ruby-core:20217] Re: Behavior: autoload calls
> rb_require() directly"
>     on Wed, 3 Dec 2008 02:57:13 +0900, Dave Thomas <dave@pragprog.com>
>     writes:
> 
> |If you're worried about fragility, then isn't the ability to redefine
> |Fixnum#+ more of an issue?
> 
> I mentioned about fragility just because that will be an issue for Ruby
> 2.0.  For MRI replacing core methods affect less, just because core
> functionality is done by C functions.  But implantation like Rubinius
> suffers more.  I think we will soon need to start discussing
> separating/protecting core implementation from user code by some kind of
> namespaces or packages.
> 
> 							matz.

Actually, you can already see this kind of fragility in irb. There are 
lots of things that I might redefine while working in IRB, just because I 
want to see how they work. If they break something IRB depends on, then 
IRB will throw an exception and exit immediately.

The simplest case I can think of at the moment:
[bloom@cat-in-the-hat ~]$ irb
irb(main):001:0> $SAFE=4
/usr/lib/ruby/1.8/irb.rb:265:in `signal_status': Insecure: can't modify 
instance variable (SecurityError)
	from /usr/lib/ruby/1.8/irb.rb:147:in `eval_input'
	from /usr/lib/ruby/1.8/irb/ruby-lex.rb:244:in 
`each_top_level_statement'
	from /usr/lib/ruby/1.8/irb/ruby-lex.rb:230:in `loop'
	from /usr/lib/ruby/1.8/irb/ruby-lex.rb:230:in 
`each_top_level_statement'
	from /usr/lib/ruby/1.8/irb/ruby-lex.rb:229:in `catch'
	from /usr/lib/ruby/1.8/irb/ruby-lex.rb:229:in 
`each_top_level_statement'
	from /usr/lib/ruby/1.8/irb.rb:146:in `eval_input'
	from /usr/lib/ruby/1.8/irb.rb:70:in `start'
	from /usr/lib/ruby/1.8/irb.rb:69:in `catch'
	from /usr/lib/ruby/1.8/irb.rb:69:in `start'
	from /usr/bin/irb:13
[bloom@cat-in-the-hat ~]$ 



-- 
Chanoch (Ken) Bloom. PhD candidate. Linguistic Cognition Laboratory.
Department of Computer Science. Illinois Institute of Technology.
http://www.iit.edu/~kbloom1/