{"ast_node_type":"variable","tokens":[{"end":28,"kind":"keyword","start":0,"text":"let"}]}
            let is_mutable =
        if let Some(self_param_syn) = param_list.self_param().filter(|it| collector.check_cfg(it)) {
                self_param_syn.mut_token().is_some() && self_param_syn.amp_token().is_none();