>> It allows you to create a minimal lighwight class with no name by
>> doing "Behavior new". This can for example be used for emulating
>> instance specific behavior:
>> testChange
>>     "self run: #testChange"
>>     | behavior browser |
>>     behavior := Behavior new.
>>     behavior superclass: Browser.
>>     behavior setFormat: Browser format.
>>     browser := Browser new.
>>     browser primitiveChangeClassTo: behavior new.
>>     behavior compile: 'thisIsATest  ^ 2'.
>>     self assert: browser thisIsATest = 2.
>>     self should: [Browser new thisIsATest] raise: 
>> MessageNotUnderstood.
>
> that's interesting. however, I noticed that alt-n on "#thisIsATest" 
> gives no implementor. also, I did

Normally since anonyous class are not registered in SystemDictionary.

>
>  behavior compile: 'anotherTest ^ self gloup'
>
> and alt-m on "gloup" also gives no senders.
>
> more unpleasantly,
>
>  browser anotherTest
>
> raises a debugger as expected (since #gloup is undefined), but the 
> debugger fails with a DNU on Behavior>>organization when its first 
> lines are selected.
>
> I would be very interested in this type of anonymous Behavior, but I 
> would need the instance specific code to be accessible through the 
> usual requests. would this be possible ?

Yes but you would have to work a bit :)
Not however that a BIG limit is that you cannot add instance specific 
state since changeClass have to have the same format. \
Have fun but save your image before running the tests :)

Stef