{"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"mbe::TokenTree::MetaVar(_,"}]}
        mbe::TokenTree::MetaVar(_, name) => format!("${name}"),
        mbe::TokenTree::Token(token) => pprust::token_to_string(token).into(),
        mbe::TokenTree::MetaVarDecl { name, kind, .. } => format!("${name}:{kind}"),