{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"token_trees.open(tt::DelimiterKind::Bracket,"}]}
        token_trees.open(tt::DelimiterKind::Bracket, call_site);
        token_trees.extend([mk_leaf('#'), mk_leaf('!')]);
        token_trees.extend_with_tt(tts);