{"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":".and_then(|(id,"}]}
                                        .and_then(|(id, _)| match id {
                                        .and_then(|it| it.iter().nth(b.index))
                                            hir_def::GenericParamId::ConstParamId(id) => {