{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"ty::Tuple(ref"}]}
            ty::Tuple(ref tupled_arguments) => tupled_arguments,
        let tupled_arguments = match pack_arg.value.layout().ty.kind() {
            _ => bug!("argument to function with \"rust-call\" ABI is not a tuple"),