{"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"let"}]}
        let lo = self.newlines.partition_point(|&it| it < range.start());
    pub fn lines(&self, range: TextRange) -> impl Iterator<Item = TextRange> + '_ {
        let hi = self.newlines.partition_point(|&it| it <= range.end());