{"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"chain!(trait_self_param,"}]}
        chain!(trait_self_param, self.params.iter_lt().map(from_lt_id(self)), toc)
        let trait_self_param = self.has_trait_self_param.then(|| toc.next()).flatten();
    }