[Pharo-project] RBNamespace does not like Trait ?

Hello, no class is created when sending defineClass: message to an RBNamespace instance with the following class string definition Object subclass: #SCElement uses: {TPrintable} instanceVariableNames: '' classVariableNames: '' poolDictionaries: '' category: #'SC' Having a quick look to the implementation, RBNamespace does not like Trait... Francois