{"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"tail_expr.syntax().first_token().and_then(|token|"}]}
                                tail_expr.syntax().first_token().and_then(|token| {
                            let Some(insert_in) =
                                    skip_whitespace_token(token.prev_token()?, Direction::Prev)