{"ast_node_type":"variable","tokens":[{"end":28,"kind":"keyword","start":0,"text":"let"}]}
    let cfg = parts.next()?;
        .split(|tt| matches!(tt, tt::TtElement::Leaf(tt::Leaf::Punct(Punct { char: ',', .. }))));
    Some((cfg, parts.filter(|it| !it.is_empty())))