{"ast_node_type":"function","tokens":[{"end":97,"kind":"keyword","start":0,"text":"fn"}]}
    fn new_tts<'sess>(tts: TokenStreamIter<'a>, span: Span, dcx: DiagCtxtHandle<'sess>) -> Self {
        MetaItemListParserContext { inside_delimiters: tts.peekable(), dcx }.parse(span)