def inspect(self, nodes):
        visitor = FrameIdentifierVisitor(self.identifiers)
        for node in nodes:
            visitor.visit(node)
Walk the node and check for identifiers.  If the scope is hard (eg:
dataset/ETHPy150Open GeekTrainer/Flask/Work/Trivia - Module 5/env/Lib/site-packages/jinja2/compiler.py/Frame.inspect