{"ast_node_type":"variable","tokens":[{"end":86,"kind":"keyword","start":0,"text":"let"}]}
        let attr_name: Vec<_> = attr.iter().map(|seg| Symbol::intern(&seg)).collect();
    pub fn tool_attrs(&self, def_id: DefId, attr: &[String]) -> Vec<(String, Span)> {
        self.tcx