{"ast_node_type":"function","tokens":[{"end":58,"kind":"keyword","start":0,"text":"fn"}]}
    fn visit_attribute(&mut self, attr: &ast::Attribute) {
impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
        let attr_info = attr.ident().and_then(|ident| BUILTIN_ATTRIBUTE_MAP.get(&ident.name));