Memorizes a function or a class decorator

def _onDecorator(self, name, line, pos, absPosition):
        """Memorizes a function or a class decorator"""
        # A class or a function must be on the top of the stack
        d = Decorator(name, line, pos, absPosition)
        if self.__lastDecorators is None:
            self.__lastDecorators = [d]
        else:
            self.__lastDecorators.append(d)