From: Brian Mitchell <binary42@...>
Date: 2009-01-14T04:12:20+09:00
Subject: [ruby-core:21317] Re: Proc-as-Binding is out again?

It seems to be more interface based rather than disallowing the access
of Proc bindings.

Proc#binding seems to still be there. I assume you'd have to avoid
such assumptions once a proc's binding is accessed, directly or
indirectly, and rollback prior optimizations that depend on those
assumptions.

Brian.

On Tue, Jan 13, 2009 at 12:48, Charles Oliver Nutter
<charles.nutter@sun.com> wrote:
> 1.8 can use a proc as a binding:
>
> $ ruby -e "x = 1; p = proc { }; eval 'puts x', p"
> 1
>
> I believe this was originally gone in 1.9, then added back. But it appears
> to be gone again.
>
> $ ruby1.9 -e "x = 1; p = proc { }; eval 'puts x', p"
> -e:1:in `eval': wrong argument type Proc (expected Binding) (TypeError)
>        from -e:1:in `<main>'
>
> Is this correct? I strongly believe Proc should not be usable as a binding,
> since I believe it is a breach of trust:
>
> x = 1
> foo { puts 'hello' }
> puts x # I can never trust the value of x!!
>
> - Charlie
>
>