{"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"(Ty::new_ref(tcx,"}]}
        (Ty::new_ref(tcx, env_region, va_list_ty, mutbl), va_list_ty)
        let va_list_ty = tcx.type_of(did).instantiate(tcx, &[region.into()]);
    };