{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":".span_extend_while(start.shrink_to_lo(),"}]}
                        .span_extend_while(start.shrink_to_lo(), |c| c == '(' || c.is_whitespace())
                    let sp = sm
                        .map_or(start, |s| s.shrink_to_hi());