{"ast_node_type":"variable","tokens":[{"end":86,"kind":"keyword","start":0,"text":"let"}]}
            let preceding_chars_start = s[..closing].rfind("\n").map_or(0, |i| i + 1);
        while let Some(closing) = s.find(&"-".repeat(length_opening as usize)) {
            if s[preceding_chars_start..closing].chars().all(is_whitespace) {