{"ast_node_type":"variable","tokens":[{"end":94,"kind":"keyword","start":0,"text":"let"}]}
                let mbc = WideChar { start: pos, end: pos + TextSize::from(char_len as u32) };
                assert!((2..=4).contains(&char_len));
                multi_byte_chars.entry(lines.len() as u32).or_default().push(mbc);