On 16 janv. 2014, at 16:58, Marcus Denker <marcus.denker@inria.fr> wrote:

Hello,

I was looking into that, the first (maybe only) reason is that the new class builder
can not make anonymous subclasses of classes with ByteLayout

Is that really a bug?

Should it really be possible to subclass a class that has a byte layout with a class that has a fixed layout?

Because:

AnonymousClassInstaller make: [ :builder |��

builder��superclass: NBExternalTypeValue ]

raises IncompatibleLayout but:

AnonymousClassInstaller make: [ :builder |��

builder��

superclass: NBExternalTypeValue;

layoutClass: ByteLayout ]

doesn't.��

A simple fix is to take the same layout class than the superclass by default instead of FixedLayout, isn't it?

For example with lazy initialization:��

SlotClassBuilder>>#layoutClass

^ layoutClass ifNil: [ layoutClass := superclass layout class ]