{"ast_node_type":"function","tokens":[{"end":77,"kind":"keyword","start":0,"text":"fn"}]}
    fn new<'sess>(delim: &'a DelimArgs, dcx: DiagCtxtHandle<'sess>) -> Self {
impl<'a> MetaItemListParser<'a> {
        MetaItemListParser::new_tts(delim.tokens.iter(), delim.dspan.entire(), dcx)