{"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"//"}]}
    // char/byte is not used. For simplicity, we return an arbitrary placeholder char.
    // NOTE: This method should only be used for highlighting ranges. The unescaped
    fn unescape(s: &str, mut callback: impl FnMut(Range<usize>, Result<char, EscapeError>)) {