[Pharo-project] problem mixing Traits and Inheritance

Hi, Here's my problem : - I have the class NSCollectionStream which define ( for example ) #atEnd - I have the class NSSubclassOfCollectionStream ( which is a suclass of NSCollectionStream). When I use a trait in NSSubclassOfCollectionStream that required the method #atEnd, the defintion in NSCollectionStream is not used and the method #atEnd is overridden with : atEnd self explicitRequirement. I think we should take care about definitions in superclass, no?