From: Nathaniel Talbott <nathaniel@...>
Date: 2003-12-29T14:34:40+09:00
Subject: Re: Inconsistent value of uninitialized variable

On Dec 28, 2003, at 23:11, Martin DeMello wrote:

> Nathaniel Talbott <nathaniel@talbott.ws> wrote:
>> Isn't it this behavior that makes it possible to define a recursive
>> block?
>>
>>    y = 0
>>    x = proc{y += 1; x.call unless(y == 100); y}
>>    p x.call
>>
>> I suppose you could require a prior assignment to x in this case, but
>> that starts to smell like having to declare variables...
>
> This is not a proper recursive block - for instance
>
> y = 0
> x = proc{y += 1; x.call unless(y == 100); y}
> z = x
> x = nil
> z.call

"Not proper" might be strong language, but yes, it could definitely be 
broken. Do you have a better construct for a recursive block?


Nathaniel

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