syntax_data: {"ast_node_type":"variable","tokens":[{"end":89,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let line_len = lo.file.get_line(line_index).map_or(0, |s| s.chars().count());
context_before:         for line_index in lo.line.saturating_sub(1)..hi_line {
context_after:             lines.push(LineInfo { line_index, start_col, end_col: CharPos::from_usize(line_len) });