{"ast_node_type":"variable","tokens":[{"end":97,"kind":"keyword","start":0,"text":"(val.span.shrink_to_lo(),"}]}
                                    (val.span.shrink_to_lo(), "if let Some(val) = ".to_string()),
                                    // if let Some(v) = val.get_mut(index) { *v = rv; }
                                    (