From: Robert Klemme <bob.news@...>
Date: 2004-04-28T17:04:02+09:00
Subject: Re: Array#hash bug?


"Mark Hubbart" <discord@mac.com> schrieb im Newsbeitrag
news:56EB0554-986E-11D8-9038-000502FDD5CC@mac.com...
> Hi,
> I was messing around with recursive arrays and I came across this:
>
> mark@imac% cat hash.rb
> a = []
> a[0] = a
> puts a.hash
> mark@imac% ruby -v hash.rb
> ruby 1.9.0 (2004-04-11) [powerpc-darwin]
> hash.rb:3:in `hash': stack level too deep (SystemStackError)
>          from hash.rb:3:in `hash'
>          from hash.rb:3:in `hash'
>          from hash.rb:3:in `hash'
>          from hash.rb:3:in `hash'
>          from hash.rb:3:in `hash'
>          from hash.rb:3:in `hash'
>          from hash.rb:3:in `hash'
>          from hash.rb:3:in `hash'
>           ... 44888 levels...
>          from hash.rb:3:in `hash'
>          from hash.rb:3:in `hash'
>          from hash.rb:3:in `hash'
>          from hash.rb:3
>
> .. looks like a bug?

Hm, I'd say that for efficiency reasons loop detection in object graphs of
arrays is not done and thus it's a bug you'll have to live with.  After
all, how often do you need self referencing containers?

    robert