{"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":"TokenTree::Delimited(..,"}]}
            TokenTree::Delimited(.., del) => check_lhs_no_empty_seq(sess, &del.tts)?,
            | TokenTree::MetaVarExpr(..) => (),
            TokenTree::Sequence(span, seq) => {