From: Eric Hodel <drbrain@...7.net>
Date: 2005-11-08T04:40:40+09:00
Subject: Only one level? (Was: Re: why?)


On Nov 7, 2005, at 7:10 AM, Dirk Meijer wrote:

> hi all,
>  def foo(string)
> arr=[string]
> puts arr
> arr.each do |b|
> foo(b)
> end
> end
> foo("foobar")
>  this results in an endless loop.. (though it gives SystemStackError)
> but why doesn't this go any deeper than one level?

Ruby 1.8.3 omits the duplicate frames:

$ ruby
def x() x end
x
-:1:in `x': stack level too deep (SystemStackError)
         from -:1:in `x'
         from -:2
$ ruby -v
ruby 1.8.3 (2005-09-21) [powerpc-darwin8.2.0]

1.8.2 and earlier do not:

$ ruby182-orig
def x() x end
x
-:1:in `x': stack level too deep (SystemStackError)
         from -:1:in `x'
         from -:1:in `x'
         from -:1:in `x'
         from -:1:in `x'
         from -:1:in `x'
         from -:1:in `x'
         from -:1:in `x'
         from -:1:in `x'
          ... 1105 levels...
         from -:1:in `x'
         from -:1:in `x'
         from -:1:in `x'
         from -:2
$ ruby182-orig -v
ruby 1.8.2 (2004-12-25) [powerpc-darwin8.0]

-- 
Eric Hodel - drbrain@segment7.net - http://segment7.net
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