From: Simon Strandgaard <0bz63fz3m1qt3001@...>
Date: 2003-06-25T08:53:46+09:00
Subject: Re: Array#pop doesn't remove last element?

On Tue, 24 Jun 2003 02:46:44 +0200, Simon Strandgaard wrote:

> On Tue, 24 Jun 2003 02:36:55 +0200, Simon Strandgaard wrote:
>> 
>> I don't understand why this exception occur... can someone enligthen me ?
> 
> OK.. I solved it..   This was because @left contained a vspace element.
> I assumed too much as usual. 

Finaly, 2 minutes ago I woke up (I am about to go to sleep).
I had an illegal a construction, like this:

	objs = @left
	objs << @current if @current 

The reason why its *illegal* in my case, is because @left must stay untouched.
I had totaly forgotten about references.

It should have been:
	objs = @left.clone
	objs << @current if @current 

@left.freeze really helped identify what was wrong. I better remember
using #freeze much more. I have only limited used this feature before.


Any hints on how one should avoid such dangerous constructions in the
future ?
Perhaps create an container where @left is a read-only variable, and then
inherit from this container ?

--
Simon Strandgaard