syntax_data: {"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:         for line_index in lo.line.saturating_sub(1)..hi_line {
context_before:         let hi_line = hi.line.saturating_sub(1);
context_after:             let line_len = lo.file.get_line(line_index).map_or(0, |s| s.chars().count());