From: Brian Candler <b.candler@...>
Date: 2010-12-25T01:04:21+09:00
Subject: Re: Undefined local variable?

Yukihiro Matsumoto wrote in post #970434:
> Hi,
>
> In message "Re: Undefined local variable?"
>     on Fri, 24 Dec 2010 14:48:41 +0900, Zhi-Qiang Lei
> <zhiqiang.lei@gmail.com> writes:
>
> |Can I refresh it?
>
> Basically, no.
>
>               matz.

That's true; if h wasn't a local variable at the time the proc was 
defined, then it is compiled as a method call.

But as an aside, you *can* change the value of h if it was a local 
variable at the time, even if it is no longer in scope.

ruby-1.9.2-p0 > def foo
ruby-1.9.2-p0 ?>  h = 4
ruby-1.9.2-p0 ?>  ->{ h }
ruby-1.9.2-p0 ?>  end
 => nil
ruby-1.9.2-p0 > l = foo
 => #<Proc:0x00000002229500@(irb):8 (lambda)>
ruby-1.9.2-p0 > l.call
 => 4
ruby-1.9.2-p0 > eval "h=5", l.binding
 => 5
ruby-1.9.2-p0 > l.call
 => 5

So maybe your solution is to do "h = nil" before defining the proc.

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