From merlyn@stonehenge.com Sat Sep 28 04:30:56 2002
From: merlyn@stonehenge.com
To: squeak-dev@lists.squeakfoundation.org
Subject: Re: [ENH] Message / Symbol / Block compatibility
Date: Wed, 26 May 1999 05:05:12 -0700
Message-ID: <m1n1ysrq87.fsf@halfdome.holdit.com>
In-Reply-To: <Marcel Weiher's message of "Wed, 26 May 1999 13:51:52 +0200">
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>>>>> "Marcel" =3D=3D Marcel Weiher <marcel(a)system.de> writes:

>> Have it return an object instantiated with a class with a superclass=20
>> of nil.  Look at ObjectTracer (I think that's it) for an example that=20
>> works.

Marcel> Yes, I think that's what I did:

Marcel> UndefinedObject subclass: #Trampoline
Marcel> 	instanceVariableNames: 'collection iterationMessage '
Marcel> 	classVariableNames: ''
Marcel> 	poolDictionaries: ''
Marcel> 	category: 'Collections-Support'

Marcel> This may have gotten mangled between fixing a typo and creating the  =

Marcel> changeset.  I hope the new changeset is better.

No, an UndefinedObject has Object somewhere in its superclass chain.
I'm talking about setting the superclass to *nil*.

UndefinedObject ~=3D nil

:)

Here's the class definition for ObjectTracer:

nil subclass: #ObjectTracer
	instanceVariableNames: 'tracedObject recursionFlag '
	classVariableNames: ''
	poolDictionaries: ''
	category: 'Kernel-Objects'

Look at it to make sure you're doing the right thing.

--=20
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