From: Christoph Rippel <crippel@...>
Date: 2001-02-23T01:30:13+09:00
Subject: [ruby-talk:11326] Re: Array bugs?

> -----Original Message-----
> From: ts [mailto:decoux@moulon.inra.fr]
> Sent: Thursday, February 22, 2001 07:10 AM
> To: ruby-talk ML
> Cc: ruby-talk@ruby-lang.org
> Subject: [ruby-talk:11320] Re: Array bugs?
> 
> 
> >>>>> "C" == Christoph Rippel <crippel@primenet.com> writes:
> 
> C> I think the problem is with the hashing algorithm. All array 
> 
>  rb_ary_hash() I think
> 
> C> methods which might invoke array hashing (basically &,|,uniq, 
> C> and hashing it self) hang (on my maschine) on self-referential
> C> (recursive) arrays.
> 
>  Same problem with Array#eql?, Array#<=>

Actually #== and #- and #delete are effected too ... 
ruby -e 'a=[]; a << a; b = [] ; b << b; b == b'
ruby -e 'a=[]; a << a; b = [] ; b << b; b.delete a'
ruby -e 'a=[]; a << a; b = [] ; b << b; b - b'

All these ruby methods in array.c are recursive. The 
same problem is probably also in hash  - and it extends
to arrays which contain object with non-id based #== 
methods.

[...]

Christoph