{"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"inside_delimiters:"}]}
    inside_delimiters: Peekable<TokenStreamIter<'a>>,
    // the tokens inside the delimiters, so `#[some::attr(a b c)]` would have `a b c` inside
    dcx: DiagCtxtHandle<'sess>,