{"ast_node_type":"other","tokens":[{"end":38,"kind":"keyword","start":0,"text":"TokenTree::Token(..)"}]}
            TokenTree::Token(..) => 0,
            TokenTree::Delimited(.., delim) => count_metavar_decls(&delim.tts),
            TokenTree::MetaVar(..) | TokenTree::MetaVarExpr(..) => unreachable!(),