From: John Fletcher <J.P.Fletcher@...>
Date: 2006-07-20T01:11:09+09:00
Subject: Patch to Ruby in 2005

--Message-Boundary-9171
Content-Type: Multipart/Mixed; boundary=Message-Boundary-9171


--Message-Boundary-9171
Content-type: text/plain; charset=US-ASCII
Content-transfer-encoding: 7BIT
Content-description: Mail message body

According to the ChangeLog in Ruby 1.8.4 the 
following patch was made to Ruby in 2005

Wed Jun  8 08:33:10 2005  Nobuyoshi Nakada  <nobu@ruby-
lang.org>
* eval.c (backtrace): skip successive frames sharing same node. 

We are having some trouble as a result, because when using the 
coerce feature of ruby, the call stack no longer contains the 
information needed, and we have traced this to a line of code in
backtrace in eval.c.

 if (frame->prev->node == n) continue;

If this is commented out then the problem goes away.

The problem is that the calling operator e.g. `+' is no longer in the
string given by caller[0] and so it is not possible to take different
action depending on different operators.

For more details please see the discussion on

http://c2.com/cgi/wiki?ElizabethWiethoff

Please would you consider reversing this change or else modifying 
it
so that the previous behaviour is restored for coerce.

Example code for what is being done is on 

http://c2.com/cgi/wiki?RubyCoerce

I guess that there may be other reasons why you made the change.

Thank you

John Fletcher
-- 
Dr John P. Fletcher   Tel: (44) 121 204 3389 (direct line)
Chemical Engineering and Applied Chemistry (CEAC),
School of Engineering and Applied Science (SEAS),
Aston University, Aston Triangle, BIRMINGHAM B4 7ET  U.K.               
CEAC Web site http://www.ceac.aston.ac.uk/
FAX: (44) 121 204 3679



--Message-Boundary-9171
Content-type: Application/Octet-stream; name="-"; type=Plain text
Content-disposition: attachment; filename="-"
Content-transfer-encoding: BASE64
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--Message-Boundary-9171--
--Message-Boundary-9171--