From: John Sikora <john.sikora@...>
Date: 2010-10-07T04:08:55+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>'
> ruby-1.9.2-p0 > eval("x")
> NameError: undefined local variable or method `x' for main:Object
>   from (irb):7:in `eval'
>   from (irb):7:in `eval'
>   from (irb):7
>   from /home/martin/.rvm/rubies/ruby-1.9.2-p0/bin/irb:17:in `<main>'
> ruby-1.9.2-p0 > eval("x", b)
>  => 5
> 
> martin

Hmmm, it seems to work when x is already defined (in 1.9.2):

irb(main):001:0> x=4
=> 4
irb(main):002:0> b=binding
=> #<Binding:0xfa2ab0>
irb(main):003:0> eval("x=5", b)
=> 5
irb(main):004:0> x
=> 5
irb(main):005:0>

If I do not set x to a value beforehand, I get the same error. Do not 
know why though.

js
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