From: David Flanagan <david@...>
Date: 2008-10-08T05:47:36+09:00
Subject: [ruby-core:19180] Re: [Feature #615] "with" operator

_why wrote:
> I really think this is a good idea for a `with` method, though.

I think it's worth mentioning that the with statement has caused no end 
of grief for JavaScript. I haven't followed this closely, so I can't 
explain why, but I gather that JavaScript implementors hate it because 
it makes optimizations difficult in the interpreter or VM.  And the 
security folks hate it because it raises security issues of some sort.

I suspect (but don't have the expertise to know) that Ruby is already 
complex enough that adding with wouldn't appreciably change the 
optimization or security picture, it is an issue to at least be aware of 
in this discussion.

	David Flanagan