def CLASSDEF(self, node):
        """
        Check names used in a class definition, including its decorators, base
        classes, and the body of its definition.  Additionally, add its name to
        the current scope.
        """
        for deco in node.decorator_list:
            self.handleNode(deco, node)
        for baseNode in node.bases:
            self.handleNode(baseNode, node)
        if not PY2:
            for keywordNode in node.keywords:
                self.handleNode(keywordNode, node)
        self.pushScope(ClassScope)
        # doctest does not process doctest within a doctest
        # classes within classes are processed.
        if (self.withDoctest and
                not self._in_doctest() and
                not isinstance(self.scope, FunctionScope)):
            self.deferFunction(lambda: self.handleDoctests(node))
        for stmt in node.body:
            self.handleNode(stmt, node)
        self.popScope()
        self.addBinding(node, ClassDefinition(node.name, node))
Check names used in a class definition, including its decorators, base
        classes, and the body of its definition.  Additionally, add its name to
        the current scope.