{"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"&mbe::TokenTree::MetaVar(sp,"}]}
            &mbe::TokenTree::MetaVar(sp, original_ident) => {
            // Replace the meta-var with the matched token tree from the invocation.
                transcribe_metavar(&mut tscx, sp, original_ident)?;