From: Brian Candler <b.candler@...>
Date: 2010-10-06T21:43:42+09:00
Subject: Re: setting local variables in a binding

Martin DeMello wrote:
> Why does this not work?
> 
> ruby-1.9.2-p0 > b = binding
>  => #<Binding:0x9adc81c>
> ruby-1.9.2-p0 > eval("x = 5", b)
>  => 5
> ruby-1.9.2-p0 > x
> NameError: undefined local variable or method `x' for main:Object
>   from (irb):6
>   from /home/martin/.rvm/rubies/ruby-1.9.2-p0/bin/irb:17:in `<main>'

irb(main):001:0> b = binding
=> #<Binding:0x7f9079ec7460>
irb(main):002:0> eval("x = 5", b)
=> 5
irb(main):003:0> x
=> 5
irb(main):004:0> RUBY_DESCRIPTION
=> "ruby 1.8.7 (2010-01-10 patchlevel 249) [x86_64-linux]"

It might be an irb-ism in 1.9. Have you tried it in a standalone .rb 
program?
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