{"ast_node_type":"variable","tokens":[{"end":51,"kind":"keyword","start":0,"text":"let"}]}
        let last_line = &within[last_line_start..];
        let last_line_start = within.rfind('\n').map_or(0, |i| i + 1);
        let last_line_trimmed = last_line.trim_start_matches(is_whitespace);